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* [dpdk-dev] [PATCH v1] doc: rework vm power manager user guide
@ 2020-01-07  9:13 David Hunt
  2020-02-16 11:13 ` Thomas Monjalon
  2020-02-17 10:48 ` [dpdk-dev] [PATCH v2] " David Hunt
  0 siblings, 2 replies; 8+ messages in thread
From: David Hunt @ 2020-01-07  9:13 UTC (permalink / raw)
  To: dev; +Cc: john.mcnamara, marko.kovacevic, David Hunt

Review and re-work of vm_power_manager documentation. Hopefully this
is clearer, easier to follow.

Signed-off-by: David Hunt <david.hunt@intel.com>
---
 .../img/vm_power_mgr_highlevel.svg            | 2189 +++++++++++------
 .../img/vm_power_mgr_vm_request_seq.svg       | 1455 +++++------
 .../sample_app_ug/vm_power_management.rst     | 1194 +++++----
 3 files changed, 2775 insertions(+), 2063 deletions(-)

diff --git a/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg b/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg
index 92f882674..c251bcda6 100644
--- a/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg
+++ b/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg
@@ -1,710 +1,1491 @@
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-						x="22" dy="1.2em" class="st18">via Virtio</tspan><tspan class="st18">-</tspan><tspan class="st18">Serial channel </tspan><tspan
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-			<title>Box.55</title>
-			<desc>Linux “userspace” power governor /sys/devices/system/cpu/cpuN...</desc>
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-						class="st18">Virtio Serial endpoints</tspan><tspan class="st18">, </tspan><tspan x="22" dy="1.2em"
-						class="st18">monitored via </tspan>epoll <tspan x="4" dy="1.212em" class="st17">·</tspan><tspan
-						class="st17"> </tspan><tspan class="st18">Commands include the </tspan><tspan x="22" dy="1.204em"
-						class="st18">virtual core to be modified</tspan><tspan class="st18">, </tspan><tspan x="22" dy="1.2em"
-						class="st18">using </tspan>libvirt <tspan class="st18">to get physical </tspan><tspan x="22" dy="1.2em"
-						class="st18">core mapping </tspan><tspan x="4" dy="1.212em" class="st17">·</tspan><tspan class="st17"> </tspan><tspan
-						class="st18">Uses librte</tspan><tspan class="st18">_</tspan><tspan class="st18">power to affect </tspan><tspan
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-						x="22" dy="1.2em" class="st18">governor</tspan><tspan class="st18">(</tspan><tspan class="st18">APCI cpufreq</tspan><tspan
-						class="st18">) </tspan><tspan x="4" dy="1.212em" class="st17">·</tspan><tspan class="st17"> </tspan><tspan
-						class="st18">CLI</tspan><tspan class="st18">: </tspan><tspan class="st18">For adding VM channels </tspan><tspan
-						x="22" dy="1.204em" class="st18">to monitor</tspan><tspan class="st18">, </tspan><tspan class="st18">inspecting and </tspan><tspan
-						x="22" dy="1.2em" class="st18">changing channel state</tspan><tspan class="st18">, </tspan><tspan x="22"
-						dy="1.2em" class="st18">manually altering CPU </tspan><tspan x="22" dy="1.2em" class="st18">frequency</tspan><tspan
-						class="st18">. </tspan><tspan class="st18">Also allows for the </tspan><tspan x="22" dy="1.2em"
-						class="st18">changing of vCPU to pCPU </tspan><tspan x="22" dy="1.2em" class="st18">pinning</tspan><tspan
-						class="st18">.</tspan></text>		</g>
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-			<title>Box.62</title>
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-		<g id="shape51-407" transform="translate(26.8039,-216.039)">
-			<title>Box.51</title>
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-			<title>Box.25</title>
-			<desc>Channel Manager</desc>
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-			<title>Box.41</title>
-			<desc>QEMU</desc>
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-			<title>Box.42</title>
-			<desc>libvirt</desc>
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-			<text x="59.98" y="452.82" class="st11">libvirt</text>		</g>
-		<g id="shape43-433" transform="translate(168.536,-231.718)">
-			<title>Dynamic connector.43</title>
-			<path d="M0 465.98 L10.63 465.98 L10.63 466.16 L73.21 466.16" class="st24"/>
-		</g>
-		<g id="shape69-441" transform="translate(168.536,-190.527)">
-			<title>Dynamic connector</title>
-			<path d="M0 458.98 L10.63 458.98 L10.63 475.99 L63.29 475.99" class="st24"/>
-		</g>
-		<g id="shape26-447" transform="translate(26.8039,-181.846)">
-			<title>Box.26</title>
-			<desc>librte_power(Host)</desc>
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-			<rect x="0" y="441.623" width="141.732" height="17.3622" class="st19"/>
-			<text x="35.53" y="452.82" class="st11">librte_power(Host)</text>		</g>
-		<g id="shape68-453" transform="translate(168.536,-200.449)">
-			<title>Dynamic connector.68</title>
-			<desc>Map vCPU to pCPU</desc>
-			<path d="M5.8 451.9 L6.16 451.9 L73.21 451.9" class="st26"/>
-			<rect x="4.11883" y="447.099" width="71.1324" height="9.59985" class="st27"/>
-			<text x="4.12" y="454.3" class="st13">Map vCPU to pCPU</text>		</g>
-		<g id="shape27-464" transform="translate(26.8039,-164.838)">
-			<title>Box.27</title>
-			<desc>VM Power CLI</desc>
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-			<rect x="0" y="441.623" width="141.732" height="17.3622" class="st22"/>
-			<text x="44.2" y="452.82" class="st11">VM Power CLI</text>		</g>
-	</g>
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diff --git a/doc/guides/sample_app_ug/vm_power_management.rst b/doc/guides/sample_app_ug/vm_power_management.rst
index bb2aa4faf..d43ba9cbe 100644
--- a/doc/guides/sample_app_ug/vm_power_management.rst
+++ b/doc/guides/sample_app_ug/vm_power_management.rst
@@ -1,119 +1,128 @@
 ..  SPDX-License-Identifier: BSD-3-Clause
     Copyright(c) 2010-2014 Intel Corporation.
 
-VM Power Management Application
-===============================
-
-Introduction
-------------
-
-Applications running in Virtual Environments have an abstract view of
-the underlying hardware on the Host, in particular applications cannot see
-the binding of virtual to physical hardware.
-When looking at CPU resourcing, the pinning of Virtual CPUs(vCPUs) to
-Host Physical CPUs(pCPUS) is not apparent to an application
-and this pinning may change over time.
-Furthermore, Operating Systems on virtual machines do not have the ability
-to govern their own power policy; the Machine Specific Registers (MSRs)
-for enabling P-State transitions are not exposed to Operating Systems
-running on Virtual Machines(VMs).
-
-The Virtual Machine Power Management solution shows an example of
-how a DPDK application can indicate its processing requirements using VM local
-only information(vCPU/lcore, etc.) to a Host based Monitor which is responsible
-for accepting requests for frequency changes for a vCPU, translating the vCPU
-to a pCPU via libvirt and affecting the change in frequency.
-
-The solution is comprised of two high-level components:
-
-#. Example Host Application
-
-   Using a Command Line Interface(CLI) for VM->Host communication channel management
-   allows adding channels to the Monitor, setting and querying the vCPU to pCPU pinning,
-   inspecting and manually changing the frequency for each CPU.
-   The CLI runs on a single lcore while the thread responsible for managing
-   VM requests runs on a second lcore.
-
-   VM requests arriving on a channel for frequency changes are passed
-   to the librte_power ACPI cpufreq sysfs based library.
-   The Host Application relies on both qemu-kvm and libvirt to function.
-
-   This monitoring application is responsible for:
-
-   - Accepting requests from client applications: Client applications can
-     request frequency changes for a vCPU, translating
-     the vCPU to a pCPU via libvirt and affecting the change in frequency.
-
-   - Accepting policies from client applications: Client application can
-     send a policy to the host application. The
-     host application will then apply the rules of the policy independent
-     of the application. For example, the policy can contain time-of-day
-     information for busy/quiet periods, and the host application can scale
-     up/down the relevant cores when required. See the details of the guest
-     application below for more information on setting the policy values.
-
-   - Out-of-band monitoring of workloads via cores hardware event counters:
-     The host application can manage power for an application in a virtualised
-     OR non-virtualised environment by looking at the event counters of the
-     cores and taking action based on the branch hit/miss ratio. See the host
-     application '--core-list' command line parameter below.
-
-#. librte_power for Virtual Machines
-
-   Using an alternate implementation for the librte_power API, requests for
-   frequency changes are forwarded to the host monitor rather than
-   the APCI cpufreq sysfs interface used on the host.
-
-   The l3fwd-power application will use this implementation when deployed on a VM
-   (see :doc:`l3_forward_power_man`).
+Virtual Machine Power Management Application
+============================================
+
+Applications running in virtual environments have an abstract view of
+the underlying hardware on the host. Specifically, applications cannot
+see the binding of virtual components to physical hardware. When looking
+at CPU resourcing, the pinning of Virtual CPUs (vCPUs) to Physical CPUs
+(pCPUs) on the host is not apparent to an application and this pinning
+may change over time. In addition, operating systems on Virtual Machines
+(VMs) do not have the ability to govern their own power policy. The
+Machine Specific Registers (MSRs) for enabling P-state transitions are
+not exposed to the operating systems running on the VMs.
+
+The solution demonstrated in this sample application shows an example of
+how a DPDK application can indicate its processing requirements using
+VM-local only information (vCPU/lcore, and so on) to a host resident VM
+Power Manager. The VM Power Manager is responsible for:
+
+- **Accepting requests for frequency changes for a vCPU**
+- **Translating the vCPU to a pCPU using libvirt**
+- **Performing the change in frequency**
+
+This application demonstrates the following features:
+
+- **The handling of VM application requests to change frequency.**
+  VM applications can request frequency changes for a vCPU. The VM
+  Power Management Application uses libvirt to translate that
+  virtual CPU (vCPU) request to a physical CPU (pCPU) request and
+  performs the frequency change.
+
+- **The acceptance of power management policies from VM applications.**
+  A VM application can send a policy to the host application. The
+  policy contains rules that define the power management behaviour
+  of the VM. The host application then applies the rules of the
+  policy independent of the VM application. For example, the
+  policy can contain time-of-day information for busy/quiet
+  periods, and the host application can scale up/down the relevant
+  cores when required. See :ref:`sending_policy` for information on
+  setting policy values.
+
+- **Out-of-band monitoring of workloads using core hardware event counters.**
+  The host application can manage power for an application by looking
+  at the event counters of the cores and taking action based on the
+  branch miss/hit ratio. See :ref:`enabling_out_of_band`.
+
+  **Note**: This functionality also applies in non-virtualised environments.
+
+In addition to the ``librte_power`` library used on the host, the
+application uses a special version of ``librte_power`` on each VM, which
+directs frequency changes and policies to the host monitor rather than
+the APCI ``cpufreq`` ``sysfs`` interface used on the host in non-virtualised
+environments.
 
 .. _figure_vm_power_mgr_highlevel:
 
 .. figure:: img/vm_power_mgr_highlevel.*
 
-   Highlevel Solution
+Sample Application Architecture Overview
+----------------------------------------
+
+The VM power management solution employs ``qemu-kvm`` to provide
+communications channels between the host and VMs in the form of a
+``virtio-serial`` connection that appears as a para-virtualised serial
+device on a VM and can be configured to use various backends on the
+host. For this example, the configuration of each ``virtio-serial`` endpoint
+on the host as an ``AF_UNIX`` file socket, supporting poll/select and
+``epoll`` for event notification. In this example, each channel endpoint on
+the host is monitored for ``EPOLLIN`` events using ``epoll``. Each channel
+is specified as ``qemu-kvm`` arguments or as ``libvirt`` XML for each VM,
+where each VM can have several channels up to a maximum of 64 per VM. In this
+example, each DPDK lcore on a VM has exclusive access to a channel.
+
+To enable frequency changes from within a VM, the VM forwards a
+``librte_power`` request over the ``virtio-serial`` channel to the host. Each
+request contains the vCPU and power command (scale up/down/min/max). The
+API for the host ``librte_power`` and guest ``librte_power`` is consistent
+across environments, with the selection of VM or host implementation
+determined automatically at runtime based on the environment. On
+receiving a request, the host translates the vCPU to a pCPU using the
+libvirt API before forwarding it to the host ``librte_power``.
 
 
-Overview
---------
-
-VM Power Management employs qemu-kvm to provide communications channels
-between the host and VMs in the form of Virtio-Serial which appears as
-a paravirtualized serial device on a VM and can be configured to use
-various backends on the host. For this example each Virtio-Serial endpoint
-on the host is configured as AF_UNIX file socket, supporting poll/select
-and epoll for event notification.
-In this example each channel endpoint on the host is monitored via
-epoll for EPOLLIN events.
-Each channel is specified as qemu-kvm arguments or as libvirt XML for each VM,
-where each VM can have a number of channels up to a maximum of 64 per VM,
-in this example each DPDK lcore on a VM has exclusive access to a channel.
-
-To enable frequency changes from within a VM, a request via the librte_power interface
-is forwarded via Virtio-Serial to the host, each request contains the vCPU
-and power command(scale up/down/min/max).
-The API for host and guest librte_power is consistent across environments,
-with the selection of VM or Host Implementation determined at automatically
-at runtime based on the environment.
-
-Upon receiving a request, the host translates the vCPU to a pCPU via
-the libvirt API before forwarding to the host librte_power.
-
 .. _figure_vm_power_mgr_vm_request_seq:
 
 .. figure:: img/vm_power_mgr_vm_request_seq.*
 
-   VM request to scale frequency
-
+In addition to the ability to send power management requests to the
+host, a VM can send a power management policy to the host. In some
+cases, using a power management policy is a preferred option because it
+can eliminate possible latency issues that can occur when sending power
+management requests. Once the VM sends the policy to the host, the VM no
+longer needs to worry about power management, because the host now
+manages the power for the VM based on the policy. The policy can specify
+power behavior that is based on incoming traffic rates or time-of-day
+power adjustment (busy/quiet hour power adjustment for example). See
+:ref:`sending_policy` for more information.
+
+One method of power management is to sense how busy a core is when
+processing packets and adjusting power accordingly. One technique for
+doing this is to monitor the ratio of the branch miss to branch hits
+counters and scale the core power accordingly. This technique is based
+on the premise that when a core is not processing packets, the ratio of
+branch misses to branch hits is very low, but when the core is
+processing packets, it is measurably higher. The implementation of this
+capability is as a policy of type ``BRANCH_RATIO``.
+See :ref:`sending_policy` for more information on using the
+BRANCH_RATIO policy option.
+
+A JSON interface enables the specification of power management requests
+and policies in JSON format. The JSON interfaces provide a more
+convenient and more easily interpreted interface for the specification
+of requests and policies. See :ref:`power_man_requests` for more information.
 
 Performance Considerations
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-While Haswell Microarchitecture allows for independent power control for each core,
-earlier Microarchtectures do not offer such fine grained control.
-When deployed on pre-Haswell platforms greater care must be taken in selecting
-which cores are assigned to a VM, for instance a core will not scale down
-until its sibling is similarly scaled.
+While the Haswell microarchitecture allows for independent power control
+for each core, earlier microarchitectures do not offer such fine-grained
+control. When deploying on pre-Haswell platforms, greater care must be
+taken when selecting which cores are assigned to a VM, for example, a
+core does not scale down in frequency until all of its siblings are
+similarly scaled down.
 
 Configuration
 -------------
@@ -121,636 +130,541 @@ Configuration
 BIOS
 ~~~~
 
-Enhanced Intel SpeedStep® Technology must be enabled in the platform BIOS
-if the power management feature of DPDK is to be used.
-Otherwise, the sys file folder /sys/devices/system/cpu/cpu0/cpufreq will not exist,
-and the CPU frequency-based power management cannot be used.
-Consult the relevant BIOS documentation to determine how these settings
-can be accessed.
+To use the power management features of the DPDK, you must enable
+Enhanced Intel SpeedStep® Technology in the platform BIOS. Otherwise,
+the ``sys`` file folder ``/sys/devices/system/cpu/cpu0/cpufreq`` does not
+exist, and you cannot use CPU frequency-based power management. Refer to the
+relevant BIOS documentation to determine how to access these settings.
 
 Host Operating System
 ~~~~~~~~~~~~~~~~~~~~~
 
-The DPDK Power Library can use either the *acpi_cpufreq* or *intel_pstate*
-kernel driver for the management of core frequencies. In many cases
-the *intel_pstate* driver is the default Power Management environment.
+The DPDK Power Management library can use either the ``acpi_cpufreq`` or
+the ``intel_pstate`` kernel driver for the management of core frequencies. In
+many cases, the ``intel_pstate`` driver is the default power management
+environment.
 
-Should the *acpi-cpufreq* driver be required, the *intel_pstate* module must
-be disabled, and *apci_cpufreq* module loaded in its place.
+Should the ``acpi-cpufreq driver`` be required, the ``intel_pstate``
+module must be disabled, and the ``acpi-cpufreq`` module loaded in its place.
 
-To disable *intel_pstate* driver, add the following to the grub Linux
-command line:
+To disable the ``intel_pstate`` driver, add the following to the ``grub``
+Linux command line:
 
-.. code-block:: console
+   ``intel_pstate=disable``
 
-  intel_pstate=disable
+On reboot, load the ``acpi_cpufreq`` module:
 
-Upon rebooting, load the *acpi_cpufreq* module:
-
-.. code-block:: console
-
-  modprobe acpi_cpufreq
+   ``modprobe acpi_cpufreq``
 
 Hypervisor Channel Configuration
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Virtio-Serial channels are configured via libvirt XML:
-
+Configure ``virtio-serial`` channels using ``libvirt`` XML.
+The XML structure is as follows: 
 
-.. code-block:: xml
+.. code-block:: XML
 
-  <name>{vm_name}</name>
-  <controller type='virtio-serial' index='0'>
-    <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
-  </controller>
-  <channel type='unix'>
-    <source mode='bind' path='/tmp/powermonitor/{vm_name}.{channel_num}'/>
-    <target type='virtio' name='virtio.serial.port.poweragent.{vm_channel_num}'/>
-    <address type='virtio-serial' controller='0' bus='0' port='{N}'/>
-  </channel>
+   <name>{vm_name}</name>
+   <controller type='virtio-serial' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
+   </controller>
+   <channel type='unix'>
+      <source mode='bind' path='/tmp/powermonitor/{vm_name}.{channel_num}'/>
+      <target type='virtio' name='virtio.serial.port.poweragent.{vm_channel_num}'/>
+      <address type='virtio-serial' controller='0' bus='0' port='{N}'/>
+   </channel>
 
+Where a single controller of type ``virtio-serial`` is created, up to 32
+channels can be associated with a single controller, and multiple
+controllers can be specified. The convention is to use the name of the
+VM in the host path ``{vm_name}`` and to increment ``{channel_num}`` for each
+channel. Likewise, the port value ``{N}`` must be incremented for each
+channel.
 
-Where a single controller of type *virtio-serial* is created and up to 32 channels
-can be associated with a single controller and multiple controllers can be specified.
-The convention is to use the name of the VM in the host path *{vm_name}* and
-to increment *{channel_num}* for each channel, likewise the port value *{N}*
-must be incremented for each channel.
-
-Each channel on the host will appear in *path*, the directory */tmp/powermonitor/*
-must first be created and given qemu permissions
+On the host, for each channel to appear in the path, ensure the creation
+of the ``/tmp/powermonitor/`` directory and the assignment of ``qemu``
+permissions:
 
 .. code-block:: console
 
-  mkdir /tmp/powermonitor/
-  chown qemu:qemu /tmp/powermonitor
+   mkdir /tmp/powermonitor/
+   chown qemu:qemu /tmp/powermonitor
+
+Note that files and directories in ``/tmp`` are generally removed when
+rebooting the host and you may need to perform the previous steps after
+each reboot.
 
-Note that files and directories within /tmp are generally removed upon
-rebooting the host and the above steps may need to be carried out after each reboot.
+The serial device as it appears on a VM is configured with the target
+element attribute name and must be in the form:
+``virtio.serial.port.poweragent.{vm_channel_num}``, where
+``vm_channel_num`` is typically the lcore channel to be used in
+DPDK VM applications.
 
-The serial device as it appears on a VM is configured with the *target* element attribute *name*
-and must be in the form of *virtio.serial.port.poweragent.{vm_channel_num}*,
-where *vm_channel_num* is typically the lcore channel to be used in DPDK VM applications.
+Each channel on a VM is present at:
 
-Each channel on a VM will be present at */dev/virtio-ports/virtio.serial.port.poweragent.{vm_channel_num}*
+``/dev/virtio-ports/virtio.serial.port.poweragent.{vm_channel_num}``
 
 Compiling and Running the Host Application
 ------------------------------------------
 
-Compiling
-~~~~~~~~~
+Compiling the Host Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-For information on compiling DPDK and the sample applications
+For information on compiling the DPDK and sample applications, see
 see :doc:`compiling`.
 
-The application is located in the ``vm_power_manager`` sub-directory.
+The application is located in the ``vm_power_manager`` subdirectory.
 
 To build just the ``vm_power_manager`` application using ``make``:
 
 .. code-block:: console
 
-  export RTE_SDK=/path/to/rte_sdk
-  export RTE_TARGET=build
-  cd ${RTE_SDK}/examples/vm_power_manager/
-  make
+   export RTE_SDK=/path/to/rte_sdk
+   export RTE_TARGET=build
+   cd ${RTE_SDK}/examples/vm_power_manager/
+   make
 
-The resulting binary will be ${RTE_SDK}/build/examples/vm_power_manager
+The resulting binary is ``${RTE_SDK}/build/examples/vm_power_manager``.
 
-To build just the ``vm_power_manager`` application using ``meson/ninja``:
+To build just the ``vm_power_manager`` application using ``meson``/``ninja``:
 
 .. code-block:: console
 
-  export RTE_SDK=/path/to/rte_sdk
-  cd ${RTE_SDK}
-  meson build
-  cd build
-  ninja
-  meson configure -Dexamples=vm_power_manager
-  ninja
+   export RTE_SDK=/path/to/rte_sdk
+   cd ${RTE_SDK}
+   meson build
+   cd build
+   ninja
+   meson configure -Dexamples=vm_power_manager
+   ninja
 
-The resulting binary will be ${RTE_SDK}/build/examples/dpdk-vm_power_manager
+The resulting binary is ``${RTE_SDK}/build/examples/dpdk-vm_power_manager``.
 
-Running
-~~~~~~~
+Running the Host Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-The application does not have any specific command line options other than *EAL*:
+The application does not have any specific command line options other
+than the EAL options:
 
 .. code-block:: console
 
- ./build/vm_power_mgr [EAL options]
+   ./build/vm_power_mgr [EAL options]
 
-The application requires exactly two cores to run, one core is dedicated to the CLI,
-while the other is dedicated to the channel endpoint monitor, for example to run
-on cores 0 & 1 on a system with 4 memory channels:
+The application requires exactly two cores to run. One core for the CLI
+and the other for the channel endpoint monitor. For example, to run on
+cores 0 and 1 on a system with four memory channels, issue the command:
 
 .. code-block:: console
 
- ./build/vm_power_mgr -l 0-1 -n 4
+   ./build/vm_power_mgr -l 0-1 -n 4
 
-After successful initialization the user is presented with VM Power Manager CLI:
+After successful initialization, the VM Power Manager CLI prompt appears:
 
 .. code-block:: console
 
-  vm_power>
+   vm_power>
 
-Virtual Machines can now be added to the VM Power Manager:
+Now, it is possible to add virtual machines to the VM Power Manager:
 
 .. code-block:: console
 
-  vm_power> add_vm {vm_name}
-
-When a {vm_name} is specified with the *add_vm* command a lookup is performed
-with libvirt to ensure that the VM exists, {vm_name} is used as an unique identifier
-to associate channels with a particular VM and for executing operations on a VM within the CLI.
-VMs do not have to be running in order to add them.
+   vm_power> add_vm {vm_name}
 
-A number of commands can be issued via the CLI in relation to VMs:
+When a ``{vm_name}`` is specified with the ``add_vm`` command, a lookup is
+performed with ``libvirt`` to ensure that the VM exists. ``{vm_name}`` is a
+unique identifier to associate channels with a particular VM and for
+executing operations on a VM within the CLI. VMs do not have to be
+running to add them.
 
-  Remove a Virtual Machine identified by {vm_name} from the VM Power Manager.
+It is possible to issue several commands from the CLI to manage VMs.
 
-  .. code-block:: console
-
-    rm_vm {vm_name}
-
-  Add communication channels for the specified VM, the virtio channels must be enabled
-  in the VM configuration(qemu/libvirt) and the associated VM must be active.
-  {list} is a comma-separated list of channel numbers to add, using the keyword 'all'
-  will attempt to add all channels for the VM:
-
-  .. code-block:: console
-
-    add_channels {vm_name} {list}|all
-
-  Enable or disable the communication channels in {list}(comma-separated)
-  for the specified VM, alternatively list can be replaced with keyword 'all'.
-  Disabled channels will still receive packets on the host, however the commands
-  they specify will be ignored. Set status to 'enabled' to begin processing requests again:
-
-  .. code-block:: console
-
-    set_channel_status {vm_name} {list}|all enabled|disabled
-
-  Print to the CLI the information on the specified VM, the information
-  lists the number of vCPUS, the pinning to pCPU(s) as a bit mask, along with
-  any communication channels associated with each VM, along with the status of each channel:
-
-  .. code-block:: console
+Remove the virtual machine identified by ``{vm_name}`` from the VM Power
+Manager using the command:
 
-    show_vm {vm_name}
-
-  Set the binding of Virtual CPU on VM with name {vm_name}  to the Physical CPU mask:
-
-  .. code-block:: console
+.. code-block:: console
 
-    set_pcpu_mask {vm_name} {vcpu} {pcpu}
+   rm_vm {vm_name}
 
-  Set the binding of Virtual CPU on VM to the Physical CPU:
+Add communication channels for the specified VM using the following
+command. The ``virtio`` channels must be enabled in the VM configuration
+(``qemu/libvirt``) and the associated VM must be active. ``{list}`` is a
+comma-separated list of channel numbers to add. Specifying the keyword
+``all`` attempts to add all channels for the VM:
 
-  .. code-block:: console
+.. code-block:: console
 
-    set_pcpu {vm_name} {vcpu} {pcpu}
+   set_pcpu {vm_name} {vcpu} {pcpu}
 
   Enable query of physical core information from a VM:
 
-  .. code-block:: console
+.. code-block:: console
 
-    set_query {vm_name} enable|disable
+   set_query {vm_name} enable|disable
 
 Manual control and inspection can also be carried in relation CPU frequency scaling:
 
   Get the current frequency for each core specified in the mask:
 
-  .. code-block:: console
+.. code-block:: console
 
-    show_cpu_freq_mask {mask}
+   show_cpu_freq_mask {mask}
 
   Set the current frequency for the cores specified in {core_mask} by scaling each up/down/min/max:
 
-  .. code-block:: console
+.. code-block:: console
 
-    set_cpu_freq {core_mask} up|down|min|max
+   add_channels {vm_name} {list}|all
 
-  Get the current frequency for the specified core:
+Enable or disable the communication channels in ``{list}`` (comma-separated)
+for the specified VM. Alternatively, replace ``list`` with the keyword
+``all``. Disabled channels receive packets on the host. However, the commands
+they specify are ignored. Set the status to enabled to begin processing
+requests again:
 
-  .. code-block:: console
-
-    show_cpu_freq {core_num}
+.. code-block:: console
 
-  Set the current frequency for the specified core by scaling up/down/min/max:
+   set_channel_status {vm_name} {list}|all enabled|disabled
 
-  .. code-block:: console
+Print to the CLI information on the specified VM. The information lists
+the number of vCPUs, the pinning to pCPU(s) as a bit mask, along with
+any communication channels associated with each VM, and the status of
+each channel:
 
-    set_cpu_freq {core_num} up|down|min|max
+.. code-block:: console
 
-There are also some command line parameters for enabling the out-of-band
-monitoring of branch ratio on cores doing busy polling via PMDs.
+   show_vm {vm_name}
 
-  .. code-block:: console
+Set the binding of a virtual CPU on a VM with name ``{vm_name}`` to the
+physical CPU mask:
 
-    --core-list {list of cores}
+.. code-block:: console
 
-  When this parameter is used, the list of cores specified will monitor the ratio
-  between branch hits and branch misses. A tightly polling PMD thread will have a
-  very low branch ratio, so the core frequency will be scaled down to the minimum
-  allowed value. When packets are received, the code path will alter, causing the
-  branch ratio to increase. When the ratio goes above the ratio threshold, the
-  core frequency will be scaled up to the maximum allowed value.
+   set_pcpu_mask {vm_name} {vcpu} {pcpu}
 
+Set the binding of the virtual CPU on the VM to the physical CPU:
+ 
   .. code-block:: console
 
-    --branch-ratio {ratio}
-
-  The branch ratio is a floating point number that specifies the threshold at which
-  to scale up or down for the given workload. The default branch ratio is 0.01,
-  and will need to be adjusted for different workloads.
-
-
-
-JSON API
-~~~~~~~~
-
-In addition to the command line interface for host command and a virtio-serial
-interface for VM power policies, there is also a JSON interface through which
-power commands and policies can be sent. This functionality adds a dependency
-on the Jansson library, and the Jansson development package must be installed
-on the system before the JSON parsing functionality is included in the app.
-This is achieved by:
-
-  .. code-block:: javascript
+   set_pcpu {vm_name} {vcpu} {pcpu}
 
-    apt-get install libjansson-dev
+It is also possible to perform manual control and inspection in relation
+to CPU frequency scaling.
 
-The command and package name may be different depending on your operating
-system. It's worth noting that the app will successfully build without this
-package present, but a warning is shown during compilation, and the JSON
-parsing functionality will not be present in the app.
+Get the current frequency for each core specified in the mask:
 
-Sending a command or policy to the power manager application is achieved by
-simply opening a fifo file, writing a JSON string to that fifo, and closing
-the file. In actual implementation every core has own dedicated fifo[0..n],
-where n is number of the last available core.
-Having a dedicated fifo file per core allows using standard filesystem permissions
-to ensure a given container can only write JSON commands into fifos it is allowed
-to use.
-
-The fifo is at /tmp/powermonitor/fifo[0..n]
-
-For example all cmds put to the /tmp/powermonitor/fifo7, will have
-effect only on CPU[7].
-
-The JSON string can be a policy or instruction, and takes the following
-format:
-
-  .. code-block:: javascript
-
-    {"packet_type": {
-      "pair_1": value,
-      "pair_2": value
-    }}
-
-The 'packet_type' header can contain one of two values, depending on
-whether a policy or power command is being sent. The two possible values are
-"policy" and "instruction", and the expected name-value pairs is different
-depending on which type is being sent.
-
-The pairs are the format of standard JSON name-value pairs. The value type
-varies between the different name/value pairs, and may be integers, strings,
-arrays, etc. Examples of policies follow later in this document. The allowed
-names and value types are as follows:
-
-
-:Pair Name: "command"
-:Description: The type of packet we're sending to the power manager. We can be
-  creating or destroying a policy, or sending a direct command to adjust
-  the frequency of a core, similar to the command line interface.
-:Type: string
-:Values:
-
-  :CREATE: used when creating a new policy,
-  :DESTROY: used when removing a policy,
-  :POWER: used when sending an immediate command, max, min, etc.
-:Required: yes
-:Example:
+.. code-block:: console
 
-    .. code-block:: javascript
+   show_cpu_freq_mask {mask}
 
-      "command", "CREATE"
+Set the current frequency for the cores specified in ``{core_mask}`` by
+scaling each up/down/min/max:
 
+.. code-block:: console
 
-:Pair Name: "policy_type"
-:Description: Type of policy to apply. Please see vm_power_manager documentation
-  for more information on the types of policies that may be used.
-:Type: string
-:Values:
+   set_cpu_freq {core_mask} up|down|min|max
 
-  :TIME: Time-of-day policy. Frequencies of the relevant cores are
-    scaled up/down depending on busy and quiet hours.
-  :TRAFFIC: This policy takes statistics from the NIC and scales up
-    and down accordingly.
-  :WORKLOAD: This policy looks at how heavily loaded the cores are,
-    and scales up and down accordingly.
-  :BRANCH_RATIO: This out-of-band policy can look at the ratio between
-    branch hits and misses on a core, and is useful for detecting
-    how much packet processing a core is doing.
-:Required: only for CREATE/DESTROY command
-:Example:
+Get the current frequency for the specified core:
 
-  .. code-block:: javascript
+.. code-block:: console
 
-    "policy_type", "TIME"
+   show_cpu_freq {core_num}
 
-:Pair Name: "busy_hours"
-:Description: The hours of the day in which we scale up the cores for busy
-  times.
-:Type: array of integers
-:Values: array with list of hour numbers, (0-23)
-:Required: only for TIME policy
-:Example:
-
-  .. code-block:: javascript
-
-    "busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ]
-
-:Pair Name: "quiet_hours"
-:Description: The hours of the day in which we scale down the cores for quiet
-  times.
-:Type: array of integers
-:Values: array with list of hour numbers, (0-23)
-:Required: only for TIME policy
-:Example:
+Set the current frequency for the specified core by scaling up/down/min/max:
 
-  .. code-block:: javascript
+.. code-block:: console
 
-    "quiet_hours":[ 2, 3, 4, 5, 6 ]
+   set_cpu_freq {core_num} up|down|min|max
 
-:Pair Name: "avg_packet_thresh"
-:Description: Threshold below which the frequency will be set to min for
-  the TRAFFIC policy. If the traffic rate is above this and below max, the
-  frequency will be set to medium.
-:Type: integer
-:Values: The number of packets below which the TRAFFIC policy applies the
-  minimum frequency, or medium frequency if between avg and max thresholds.
-:Required: only for TRAFFIC policy
-:Example:
+.. _enabling_out_of_band:
 
-  .. code-block:: javascript
+Command Line Options for Enabling Out-of-band Branch Ratio Monitoring
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-    "avg_packet_thresh": 100000
+There are a couple of command line parameters for enabling the out-of-band
+monitoring of branch ratios on cores doing busy polling using PMDs as
+described in the following table.
 
-:Pair Name: "max_packet_thresh"
-:Description: Threshold above which the frequency will be set to max for
-  the TRAFFIC policy
-:Type: integer
-:Values: The number of packets per interval above which the TRAFFIC policy
-  applies the maximum frequency
-:Required: only for TRAFFIC policy
-:Example:
+Table 1 – Command Line Options for Enabling Out-of-band Monitoring of
+Branch Ratios
 
-  .. code-block:: javascript
+=============================== ==============================================
+**Command Line Option**         **Description**
+=============================== ==============================================
+``--core-list {list of cores}`` | Specify the list of cores to monitor the ratio of branch misses
+                                | to branch hits.  A tightly-polling PMD thread has a very low
+                                | branch ratio, therefore the core frequency scales down to the
+                                | minimum allowed value. On receiving packets, the code path changes,
+                                | causing the branch ratio to increase. When the ratio goes above
+                                | the ratio threshold, the core frequency scales up to the maximum
+                                | allowed value.
+``--branch-ratio {ratio}``      | Specify a floating-point number that identifies the threshold at which
+                                | to scale up or down for the given workload. The default branch ratio
+                                | is 0.01 and needs adjustment for different workloads.
+=============================== ==============================================
 
-    "max_packet_thresh": 500000
 
-:Pair Name: "workload"
-:Description: When our policy is of type WORKLOAD, we need to specify how
-  heavy our workload is.
-:Type: string
-:Values:
 
-  :HIGH: For cores running workloads that require high frequencies
-  :MEDIUM: For cores running workloads that require medium frequencies
-  :LOW: For cores running workloads that require low frequencies
-:Required: only for WORKLOAD policy types
-:Example:
+Compiling and Running the Guest Applications
+--------------------------------------------
 
-  .. code-block:: javascript
+It is possible to use the ``l3fwd-power`` application (for example) with the
+``vm_power_manager``.
 
-    "workload", "MEDIUM"
+The distribution also provides a guest CLI for validating the setup.
 
-:Pair Name: "mac_list"
-:Description: When our policy is of type TRAFFIC, we need to specify the
-  MAC addresses that the host needs to monitor
-:Type: string
-:Values: array with a list of mac address strings.
-:Required: only for TRAFFIC policy types
-:Example:
+For both ``l3fwd-power`` and the guest CLI, the host application must use
+the ``add_channels`` command to monitor the channels for the VM. To do this,
+issue the following commands in the host application:
 
-  .. code-block:: javascript
+.. code-block:: console
 
-    "mac_list":[ "de:ad:be:ef:01:01", "de:ad:be:ef:01:02" ]
+   vm_power> add_vm vmname
+   vm_power> add_channels vmname all
+   vm_power> set_channel_status vmname all enabled
+   vm_power> show_vm vmname
 
-:Pair Name: "unit"
-:Description: the type of power operation to apply in the command
-:Type: string
-:Values:
+Compiling the Guest Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-  :SCALE_MAX: Scale frequency of this core to maximum
-  :SCALE_MIN: Scale frequency of this core to minimum
-  :SCALE_UP: Scale up frequency of this core
-  :SCALE_DOWN: Scale down frequency of this core
-  :ENABLE_TURBO: Enable Turbo Boost for this core
-  :DISABLE_TURBO: Disable Turbo Boost for this core
-:Required: only for POWER instruction
-:Example:
+For information on compiling DPDK and the sample applications in general,
+see :doc:`compiling`.
 
-  .. code-block:: javascript
+For compiling and running the ``l3fwd-power`` sample application, see
+:doc:`l3_forward_power_man`.
 
-    "unit", "SCALE_MAX"
+The application is in the ``guest_cli`` subdirectory under ``vm_power_manager``.
 
-JSON API Examples
-~~~~~~~~~~~~~~~~~
+To build just the ``guest_vm_power_manager`` application using ``make``, issue
+the following commands:
 
-Profile create example:
+.. code-block:: console
 
-  .. code-block:: javascript
+   export RTE_SDK=/path/to/rte_sdk
+   export RTE_TARGET=build
+   cd ${RTE_SDK}/examples/vm_power_manager/guest_cli/
+   make
 
-    {"policy": {
-      "command": "create",
-      "policy_type": "TIME",
-      "busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ],
-      "quiet_hours":[ 2, 3, 4, 5, 6 ]
-    }}
+The resulting binary is ``${RTE_SDK}/build/examples/guest_cli``.
 
-Profile destroy example:
+**Note**: This sample application conditionally links in the Jansson JSON
+library. Consequently, if you are using a multilib or cross-compile
+environment, you may need to set the ``PKG_CONFIG_LIBDIR`` environmental
+variable to point to the relevant ``pkgconfig`` folder so that the correct
+library is linked in.
 
-  .. code-block:: javascript
+For example, if you are building for a 32-bit target, you could find the
+correct directory using the following find command:
 
-    {"policy": {
-      "command": "destroy"
-    }}
+.. code-block:: console
 
-Power command example:
+   # find /usr -type d -name pkgconfig
+   /usr/lib/i386-linux-gnu/pkgconfig
+   /usr/lib/x86_64-linux-gnu/pkgconfig
 
-  .. code-block:: javascript
+Then use:
 
-    {"instruction": {
-      "command": "power",
-      "unit": "SCALE_MAX"
-    }}
+.. code-block:: console
 
-To send a JSON string to the Power Manager application, simply paste the
-example JSON string into a text file and cat it into the proper fifo:
+   export PKG_CONFIG_LIBDIR=/usr/lib/i386-linux-gnu/pkgconfig
 
-  .. code-block:: console
+You then use the ``make`` command as normal, which should find the 32-bit
+version of the library, if it installed. If not, the application builds
+without the JSON interface functionality.
 
-    cat file.json >/tmp/powermonitor/fifo[0..n]
+To build just the ``vm_power_manager`` application using ``meson``/``ninja``:
 
-The console of the Power Manager application should indicate the command that
-was just received via the fifo.
+.. code-block:: console
 
-Compiling and Running the Guest Applications
---------------------------------------------
+   export RTE_SDK=/path/to/rte_sdk
+   cd ${RTE_SDK}
+   meson build
+   cd build
+   ninja
+   meson configure -Dexamples=vm_power_manager/guest_cli
+   ninja
 
-l3fwd-power is one sample application that can be used with vm_power_manager.
+The resulting binary is ``${RTE_SDK}/build/examples/guest_cli``.
 
-A guest CLI is also provided for validating the setup.
+Running the Guest Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-For both l3fwd-power and guest CLI, the channels for the VM must be monitored by the
-host application using the *add_channels* command on the host. This typically uses
-the following commands in the host application:
+The standard EAL command line parameters are necessary:
 
 .. code-block:: console
 
-  vm_power> add_vm vmname
-  vm_power> add_channels vmname all
-  vm_power> set_channel_status vmname all enabled
-  vm_power> show_vm vmname
-
+   ./build/vm_power_mgr [EAL options] -- [guest options]
 
-Compiling
-~~~~~~~~~
+The guest example uses a channel for each lcore enabled. For example, to
+run on cores 0, 1, 2 and 3:
 
-For information on compiling DPDK and the sample applications
-see :doc:`compiling`.
+.. code-block:: console
 
-For compiling and running l3fwd-power, see :doc:`l3_forward_power_man`.
+   ./build/guest_vm_power_mgr -l 0-3
 
-The application is located in the ``guest_cli`` sub-directory under ``vm_power_manager``.
+.. _sending_policy:
 
-To build just the ``guest_vm_power_manager`` application using ``make``:
+Command Line Options Available When Sending a Policy to the Host
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-.. code-block:: console
+Optionally, there are several command line options for a user who needs
+to send a power policy to the host application. The following table
+describes these options.
 
-  export RTE_SDK=/path/to/rte_sdk
-  export RTE_TARGET=build
-  cd ${RTE_SDK}/examples/vm_power_manager/guest_cli/
-  make
+Table 1 – Command Line Options Available When Sending a Policy to the Host
 
-The resulting binary will be ${RTE_SDK}/build/examples/guest_cli
+======================================= ======================================
+**Command Line Option**                 **Description**
+======================================= ======================================
+``--vm-name {name of guest vm}``        | Allows the user to change the virtual machine name passed
+                                        | down to the host application using the power policy. The
+                                        | default is ubuntu2.
+``--vcpu-list {list vm cores}``         | A comma-separated list of cores in the VM that the user
+                                        | wants the host application to monitor. The list of cores
+                                        | in any vm starts at zero, and the host application maps
+                                        | these to the physical cores once the policy passes down
+                                        | to the host. Valid syntax includes individual cores
+                                        | 2,3,4, a range of cores 2-4, or a combination of both
+                                        | 1,3,5-7.
+``--busy-hours {list of busy hours}``   | A comma-separated list of hours in which to set the core
+                                        | frequency to the maximum. Valid syntax includes
+                                        | individual hours 2,3,4, a range of hours 2-4, or a
+                                        | combination of both 1,3,5-7. Valid hour values are 0 to 23.
+``--quiet-hours {list of quiet hours}`` | A comma-separated list of hours in which to set the core
+                                        | frequency to minimum. Valid syntax includes individual
+                                        | hours 2,3,4, a range of hours 2-4, or a combination of
+                                        | both 1,3,5-7. Valid hour values are 0 to 23.
+``--policy {policy type}``              | The type of policy. This can be one of the following values:
 
-.. Note::
-  This sample application conditionally links in the Jansson JSON
-  library, so if you are using a multilib or cross compile environment you
-  may need to set the ``PKG_CONFIG_LIBDIR`` environmental variable to point to
-  the relevant pkgconfig folder so that the correct library is linked in.
+                                        - | TRAFFIC Based on incoming traffic rates on the NIC.
 
-  For example, if you are building for a 32-bit target, you could find the
-  correct directory using the following ``find`` command:
+                                        - | TIME - Uses a busy/quiet hours policy.
 
-  .. code-block:: console
+                                        - | BRANCH_RATIO - Uses branch ratio counters to determine
+                                          | core busyness.
 
-      # find /usr -type d -name pkgconfig
-      /usr/lib/i386-linux-gnu/pkgconfig
-      /usr/lib/x86_64-linux-gnu/pkgconfig
+                                        - | WORKLOAD - Sets the frequency to low, medium or high
+                                          | based on the received policy setting.
 
-  Then use:
+                                        | **Note**: Not all policy types need all parameters. For
+                                        |           example, BRANCH_RATIO only needs the vcpu-list
+                                        |           parameter.
+======================================= ======================================
 
-  .. code-block:: console
+After successful initialization, the VM Power Manager Guest CLI prompt
+appears:
 
-      export PKG_CONFIG_LIBDIR=/usr/lib/i386-linux-gnu/pkgconfig
+.. code-block:: console
 
-  You then use the make command as normal, which should find the 32-bit
-  version of the library, if it installed. If not, the application will
-  be built without the JSON interface functionality.
+   vm_power(guest)>
 
-To build just the ``vm_power_manager`` application using ``meson/ninja``:
+To change the frequency of an lcore, use a ``set_cpu_freq`` command similar
+to the following:
 
 .. code-block:: console
 
-  export RTE_SDK=/path/to/rte_sdk
-  cd ${RTE_SDK}
-  meson build
-  cd build
-  ninja
-  meson configure -Dexamples=vm_power_manager/guest_cli
-  ninja
-
-The resulting binary will be ${RTE_SDK}/build/examples/guest_cli
+   set_cpu_freq {core_num} up|down|min|max
 
-Running
-~~~~~~~
+where, ``{core_num}`` is the lcore and channel to change frequency by
+scaling up/down/min/max.
 
-The standard *EAL* command line parameters are required:
+To start an application, configure the power policy, and send it to the
+host, use a command like the following:
 
 .. code-block:: console
 
- ./build/guest_vm_power_mgr [EAL options] -- [guest options]
+   ./build/guest_vm_power_mgr -l 0-3 -n 4 -- --vm-name=ubuntu --policy=BRANCH_RATIO --vcpu-list=2-4
 
-The guest example uses a channel for each lcore enabled. For example,
-to run on cores 0,1,2,3:
+Once the VM Power Manager Guest CLI appears, issuing the 'send_policy now' command
+will send the policy to the host:
 
 .. code-block:: console
 
- ./build/guest_vm_power_mgr -l 0-3
-
-Optionally, there is a list of command line parameter should the user wish to send a power
-policy down to the host application. These parameters are as follows:
+  send_policy now
 
-  .. code-block:: console
+Once the policy is sent to the host, the host application takes over the power monitoring
+of the specified cores in the policy.
 
-    --vm-name {name of guest vm}
+.. _power_man_requests:
 
-  This parameter allows the user to change the Virtual Machine name passed down to the
-  host application via the power policy. The default is "ubuntu2"
+JSON Interface for Power Management Requests and Policies
+---------------------------------------------------------
 
-  .. code-block:: console
+In addition to the command line interface for the host command, and a
+``virtio-serial`` interface for VM power policies, there is also a JSON
+interface through which power commands and policies can be sent.
 
-    --vcpu-list {list vm cores}
+**Note**: This functionality adds a dependency on the Jansson library.
+Install the Jansson development package on the system to avail of the
+JSON parsing functionality in the app. Issue the ``apt-get install
+libjansson-dev`` command to install the development package. The command
+and package name may be different depending on your operating system. It
+is worth noting that the app builds successfully if this package is not
+present, but a warning displays during compilation, and the JSON parsing
+functionality is not present in the app.
 
-  A comma-separated list of cores in the VM that the user wants the host application to
-  monitor. The list of cores in any vm starts at zero, and these are mapped to the
-  physical cores by the host application once the policy is passed down.
-  Valid syntax includes individual cores '2,3,4', or a range of cores '2-4', or a
-  combination of both '1,3,5-7'
+Send a request or policy to the VM Power Manager by simply opening a
+fifo file at ``/tmp/powermonitor/fifo``, writing a JSON string to that file,
+and closing the file.
 
-  .. code-block:: console
+The JSON string can be a power management request or a policy, and takes
+the following format:
 
-    --busy-hours {list of busy hours}
+.. code-block:: javascript
 
-  A comma-separated list of hours within which to set the core frequency to maximum.
-  Valid syntax includes individual hours '2,3,4', or a range of hours '2-4', or a
-  combination of both '1,3,5-7'. Valid hours are 0 to 23.
+   {"packet_type": {
+   "pair_1": value,
+   "pair_2": value
+   }}
 
-  .. code-block:: console
+The ``packet_type`` header can contain one of two values, depending on
+whether a power management request or policy is being sent. The two
+possible values are ``instruction`` and ``policy`` and the expected name-value
+pairs are different depending on which type is sent.
 
-    --quiet-hours {list of quiet hours}
+The pairs are in the format of standard JSON name-value pairs. The value
+type varies between the different name-value pairs, and may be integers,
+strings, arrays, and so on. See :ref:`json_interface_ex`
+for examples of policies and instructions and
+:ref:`json_name_value_pair` for the supported names and value types.
 
-  A comma-separated list of hours within which to set the core frequency to minimum.
-  Valid syntax includes individual hours '2,3,4', or a range of hours '2-4', or a
-  combination of both '1,3,5-7'. Valid hours are 0 to 23.
+.. _json_interface_ex:
 
-  .. code-block:: console
+JSON Interface Examples
+~~~~~~~~~~~~~~~~~~~~~~~
 
-    --policy {policy type}
+The following is an example JSON string that creates a time-profile
+policy.
 
-  The type of policy. This can be one of the following values:
-  TRAFFIC - based on incoming traffic rates on the NIC.
-  TIME - busy/quiet hours policy.
-  BRANCH_RATIO - uses branch ratio counters to determine core busyness.
-  Not all parameters are needed for all policy types. For example, BRANCH_RATIO
-  only needs the vcpu-list parameter, not any of the hours.
+.. code-block:: JSON
 
+   {"policy": {
+   "name": "ubuntu",
+   "command": "create",
+   "policy_type": "TIME",
+   "busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ],
+   "quiet_hours":[ 2, 3, 4, 5, 6 ],
+   "core_list":[ 11 ]
+   }}
 
-After successful initialization the user is presented with VM Power Manager Guest CLI:
+The following is an example JSON string that removes the named policy.
 
-.. code-block:: console
+.. code-block:: JSON
 
-  vm_power(guest)>
+   {"policy": {
+   "name": "ubuntu",
+   "command": "destroy",
+   }}
 
-To change the frequency of a lcore, use the set_cpu_freq command.
-Where {core_num} is the lcore and channel to change frequency by scaling up/down/min/max.
+The following is an example JSON string for a power management request.
 
-.. code-block:: console
+.. code-block:: JSON
 
-  set_cpu_freq {core_num} up|down|min|max
+   {"instruction": {
+   "name": "ubuntu",
+   "command": "power",
+   "unit": "SCALE_MAX",
+   "resource_id": 10
+   }}
 
 To query the available frequences of an lcore, use the query_cpu_freq command.
 Where {core_num} is the lcore to query.
@@ -783,3 +697,215 @@ will send the policy to the host:
 
 Once the policy is sent to the host, the host application takes over the power monitoring
 of the specified cores in the policy.
+
+.. _json_name_value_pair:
+
+JSON Name-value Pairs
+~~~~~~~~~~~~~~~~~~~~~
+
+The following are the name-value pairs supported by the JSON interface:
+
+-  `avg_packet_thresh`_
+-  `busy_hours`_
+-  `command`_
+-  `core_list`_
+-  `mac_list`_
+-  `max_packet_thresh`_
+-  `name`_
+-  `policy_type`_
+-  `quiet_hours`_
+-  `resource_id`_
+-  `unit`_
+-  `workload`_
+
+avg_packet_thresh
+^^^^^^^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "avg_packet_thresh"
+================== ===========================================================
+ **Description:**   | The threshold below which the frequency is set to the minimum value for the
+                    | TRAFFIC policy. If the traffic rate is above this value and below the
+                    | maximum value, the frequency is set to medium.
+ **Type:**          integer
+ **Values:**        | The number of packets below which the TRAFFIC policy applies the minimum
+                    | frequency, or the medium frequency if between the average and maximum
+                    | thresholds.
+ **Required:**      Yes
+ **Example:**       ``"avg_packet_thresh": 100000``
+================== ===========================================================
+
+busy_hours
+^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "busy_hours"
+================== ===========================================================
+ **Description:**   The hours of the day in which we scale up the cores for busy times.
+ **Type:**          array of integers
+ **Values:**        An array with a list of hour values (0-23).
+ **Required:**      For the TIME policy only.
+ **Example:**       ``"busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ]``
+================== ===========================================================
+
+command
+^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "command"
+================== ===========================================================
+ **Description:**   | The type of packet to send to the VM Power Manager. It is possible to create
+                    | or destroy a policy or send a direct command to adjust the frequency of a core,
+                    | as is possible on the command line interface.
+ **Type:**          | string
+ **Values:**        Possible values are:
+
+                    - CREATE: Create a new policy.
+                    - DESTROY: Remove an existing policy.
+                    - POWER: Send an immediate command, max, min, and so on.
+
+ **Required:**       Yes
+ **Example:**        ``"command": "CREATE"``
+================== ===========================================================
+
+core_list
+^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "core_list"
+================== ===========================================================
+ **Description:**   The cores to which to apply a policy.
+ **Type:**          array of integers
+ **Values:**        An array with a list of virtual CPUs.
+ **Required:**      For CREATE/DESTROY policy requests only.
+ **Example:**       ``"core_list":[ 10, 11 ]``
+================== ===========================================================
+
+mac_list
+^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "mac_list"
+================== ===========================================================
+ **Description:**   | When the policy is of type TRAFFIC, it is necessary to specify the MAC addresses
+                    | that the host must monitor.
+ **Type:**          | array of strings
+ **Values:**        An array with a list of mac address strings.
+ **Required:**      For TRAFFIC policy types only.
+ **Example:**       ``"mac_list":[ "de:ad:be:ef:01:01","de:ad:be:ef:01:02" ]``
+================== ===========================================================
+
+
+max_packet_thresh
+^^^^^^^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "max_packet_thresh"
+================== ===========================================================
+ **Description:**   | In a policy of type TRAFFIC, the threshold value above which the frequency is set
+                    | to a maximum.
+ **Type:**          | integer
+ **Values:**        | The number of packets per interval above which the TRAFFIC
+                    | policy applies the maximum frequency.
+ **Required:**      For the TRAFFIC policy only.
+ **Example:**       ``"max_packet_thresh": 500000``
+================== ===========================================================
+
+name
+^^^^
+
+================== ===========================================================
+ **Pair Name:**     "name"
+================== ===========================================================
+ **Description:**   | The name of the VM or host. Allows the parser to associate the policy with the
+                    | relevant VM or host OS.
+ **Type:**          | string
+ **Values:**        Any valid string.
+ **Required:**      Yes
+ **Example:**       ``"name": "ubuntu2"``
+================== ===========================================================
+
+policy_type
+^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "policy_type"
+================== ===========================================================
+ **Description:**   | The type of policy to apply. See the ``--policy`` option description for more
+                    | information.
+ **Type:**          string
+ **Values:**        Possible values are:
+
+                    - | TIME: Time-of-day policy. Scale the frequencies of the relevant cores up/down
+                      | depending on busy and quiet hours.
+                    - | TRAFFIC: Use statistics from the NIC and scale up and down accordingly.
+                    - | WORKLOAD: Determine how heavily loaded the cores are and scale up and down
+                      | accordingly.
+                    - | BRANCH_RATIO: An out-of-band policy that looks at the ratio between branch
+                      | hits and misses on a core and uses that information to determine how much
+                      | packet processing a core is doing.
+
+ **Required:**       For ``CREATE`` and ``DESTROY`` policy requests only.
+ **Example:**        ``"policy_type": "TIME"``
+================== ===========================================================
+
+quiet_hours
+^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "quiet_hours"
+================== ===========================================================
+ **Description:**   | The hours of the day to scale down the cores for quiet times.
+ **Type:**          array of integers
+ **Values:**        | An array with a list of hour numbers with values in the range 0 to 23.
+ **Required:**      For the TIME policy only.
+ **Example:**       ``"quiet_hours":[ 2, 3, 4, 5, 6 ]``
+================== ===========================================================
+
+resource_id
+^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "resource_id"
+================== ===========================================================
+ **Description:**   The core to which to apply a power command.
+ **Type:**          integer
+ **Values:**        A valid core ID for the VM or host OS.
+ **Required:**      For the ``POWER`` instruction only.
+ **Example:**       ``"resource_id": 10``
+================== ===========================================================
+
+unit
+^^^^
+
+================== ===========================================================
+ **Pair Name:**     "unit"
+================== ===========================================================
+ **Description:**   The type of power operation to apply in the command.
+ **Type:**          string
+ **Values:**         - SCALE_MAX: Scale the frequency of this core to the maximum.
+                     - SCALE_MIN: Scale the frequency of this core to the minimum.
+                     - SCALE_UP: Scale up the frequency of this core.
+                     - SCALE_DOWN: Scale down the frequency of this core.
+                     - ENABLE_TURBO: Enable Intel® Turbo Boost Technology for this core.
+                     - DISABLE_TURBO: Disable Intel® Turbo Boost Technology for this core.
+ **Required:**      For the ``POWER`` instruction only.
+ **Example:**       ``"unit": "SCALE_MAX"``
+================== ===========================================================
+
+workload
+^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "workload"
+================== ===========================================================
+ **Description:**   In a policy of type WORKLOAD, it is necessary to specify
+                    how heavy the workload is.
+ **Type:**          string
+ **Values:**         - HIGH: Scale the frequency of this core to maximum.
+                     - MEDIUM: Scale the frequency of this core to minimum.
+                     - LOW: Scale up the frequency of this core.
+ **Required:**       For the ``WORKLOAD`` policy only.
+ **Example:**        ``"workload": "MEDIUM"``
+================== ===========================================================
+
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [dpdk-dev] [PATCH v1] doc: rework vm power manager user guide
  2020-01-07  9:13 [dpdk-dev] [PATCH v1] doc: rework vm power manager user guide David Hunt
@ 2020-02-16 11:13 ` Thomas Monjalon
  2020-02-17 10:44   ` Hunt, David
  2020-02-17 10:48 ` [dpdk-dev] [PATCH v2] " David Hunt
  1 sibling, 1 reply; 8+ messages in thread
From: Thomas Monjalon @ 2020-02-16 11:13 UTC (permalink / raw)
  To: David Hunt; +Cc: dev, john.mcnamara, marko.kovacevic

07/01/2020 10:13, David Hunt:
> Review and re-work of vm_power_manager documentation. Hopefully this
> is clearer, easier to follow.
> 
> Signed-off-by: David Hunt <david.hunt@intel.com>

checkpatch is reporting a typo done several times:
	s/virutal/virtual/

> ---
>  .../img/vm_power_mgr_highlevel.svg            | 2189 +++++++++++------

This high-level diagram is nice but I disagree about having text blocks.
I think images should be image-only and the text can be in .rst.
It will be easier to update.

Thanks

>  .../img/vm_power_mgr_vm_request_seq.svg       | 1455 +++++------
>  .../sample_app_ug/vm_power_management.rst     | 1194 +++++----
>  3 files changed, 2775 insertions(+), 2063 deletions(-)




^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [dpdk-dev] [PATCH v1] doc: rework vm power manager user guide
  2020-02-16 11:13 ` Thomas Monjalon
@ 2020-02-17 10:44   ` Hunt, David
  0 siblings, 0 replies; 8+ messages in thread
From: Hunt, David @ 2020-02-17 10:44 UTC (permalink / raw)
  To: Thomas Monjalon; +Cc: dev, john.mcnamara, marko.kovacevic

Hi Thomas,

On 16/2/2020 11:13 AM, Thomas Monjalon wrote:
> 07/01/2020 10:13, David Hunt:
>> Review and re-work of vm_power_manager documentation. Hopefully this
>> is clearer, easier to follow.
>>
>> Signed-off-by: David Hunt <david.hunt@intel.com>
> checkpatch is reporting a typo done several times:
> 	s/virutal/virtual/


Initially, my checkpatch was clean, I even upgraded to using 5.5.4 
kernel, still no hits using checkpatch. It was only when I installed the 
codespell package that I finally saw the typos. New revision coming soon.


>> ---
>>   .../img/vm_power_mgr_highlevel.svg            | 2189 +++++++++++------
> This high-level diagram is nice but I disagree about having text blocks.
> I think images should be image-only and the text can be in .rst.
> It will be easier to update.
>

Good suggestion, I have the rework done, will post soon.


Thanks,

Dave.




^ permalink raw reply	[flat|nested] 8+ messages in thread

* [dpdk-dev] [PATCH v2] doc: rework vm power manager user guide
  2020-01-07  9:13 [dpdk-dev] [PATCH v1] doc: rework vm power manager user guide David Hunt
  2020-02-16 11:13 ` Thomas Monjalon
@ 2020-02-17 10:48 ` David Hunt
  2020-02-21 18:02   ` Thomas Monjalon
  2020-02-25 16:46   ` Ferruh Yigit
  1 sibling, 2 replies; 8+ messages in thread
From: David Hunt @ 2020-02-17 10:48 UTC (permalink / raw)
  To: dev; +Cc: david.hunt, john.mcnamara

Review and re-work of vm_power_manager documentation. Hopefully this
is clearer, easier to follow.

Signed-off-by: David Hunt <david.hunt@intel.com>

---
changes in v2
* Fixed typos. Typos not found even with checkpatch from kernel 5.5.4, but
  when the codespell package is installed, the typos are magically
  revealed!
* Moved the text blocks from within the high level image out into normal
  text for easier future maintenance.
---
 .../img/vm_power_mgr_highlevel.svg            | 2043 +++++++++++------
 .../img/vm_power_mgr_vm_request_seq.svg       | 1455 +++++-------
 .../sample_app_ug/vm_power_management.rst     | 1216 +++++-----
 3 files changed, 2653 insertions(+), 2061 deletions(-)

diff --git a/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg b/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg
index 92f882674..cb26d6c78 100644
--- a/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg
+++ b/doc/guides/sample_app_ug/img/vm_power_mgr_highlevel.svg
@@ -1,710 +1,1345 @@
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-			<title>Box.32</title>
-			<desc>DPDK Application</desc>
-			<g id="shadow32-192" transform="matrix(1,0,0,1,1.44,1.44)" class="st1">
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-			<title>Box.33</title>
-			<desc>VM 1</desc>
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-			<text x="40.27" y="414.52" class="st11">VM 1</text>		</g>
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-			<title>Box.34</title>
-			<desc>Virtual Core 0</desc>
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-			<text x="12.76" y="438.51" class="st13">Virtual <tspan x="12.09" dy="1.2em" class="st14">Core </tspan>0</text>		</g>
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-			<title>Box.35</title>
-			<desc>Virtual Core 1</desc>
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-			<title>Box.36</title>
-			<desc>DPDK Application</desc>
-			<g id="shadow36-219" transform="matrix(1,0,0,1,1.44,1.44)" class="st1">
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-			<title>Box.49</title>
-			<desc>DPDK VM Application Reuse librte_power interface, but provide...</desc>
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-						class="st17"> </tspan><tspan class="st18">Reuse </tspan>librte_power<tspan class="st18"> </tspan><tspan
-						class="st18">interface</tspan><tspan class="st18">, </tspan><tspan class="st18">but </tspan><tspan x="22"
-						dy="1.204em" class="st18">provides a new implementation that </tspan><tspan x="22" dy="1.2em" class="st18">forwards frequency set requests to host </tspan><tspan
-						x="22" dy="1.2em" class="st18">via Virtio</tspan><tspan class="st18">-</tspan><tspan class="st18">Serial channel </tspan><tspan
-						x="4" dy="1.212em" class="st17">·</tspan><tspan class="st17"> </tspan><tspan class="st18">Each lcore has exclusive access to a </tspan><tspan
-						x="22" dy="1.204em" class="st18">single channel </tspan><tspan x="4" dy="1.212em" class="st17">·</tspan><tspan
-						class="st17"> </tspan><tspan class="st18">Sample application re</tspan><tspan class="st18">-</tspan><tspan
-						class="st18">uses </tspan>l3fwd_power <tspan x="4" dy="1.216em" class="st17">·</tspan><tspan class="st17"> </tspan><tspan
-						class="st18">A CLI for changing frequency from within </tspan><tspan x="22" dy="1.204em" class="st18">a VM is also included</tspan><tspan
-						class="st18">.</tspan></text>		</g>
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-				<title>Sheet.40</title>
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-		</g>
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-			<title>Box.15</title>
-			<desc>OS/Hypervisor</desc>
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-			<text x="174.89" y="452.58" class="st11">OS/Hypervisor</text>		</g>
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-			<title>Box.55</title>
-			<desc>Linux “userspace” power governor /sys/devices/system/cpu/cpuN...</desc>
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-			<text x="16.72" y="441.84" class="st11">Linux “userspace” power governor <tspan x="8.93" dy="1.2em" class="st14">/</tspan>sys/devices/system/cpu/cpuN/cpufreq/</text>		</g>
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-			<title>Box.45</title>
-			<desc>VM Power Monitor Accepts VM Commands over Virtio Serial endpo...</desc>
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-			<text x="4" y="266.09" class="st11">VM Power Monitor <tspan x="4" dy="1.212em" class="st17">·</tspan><tspan
-						class="st17"> </tspan><tspan class="st18">Accepts VM Commands over </tspan><tspan x="22" dy="1.204em"
-						class="st18">Virtio Serial endpoints</tspan><tspan class="st18">, </tspan><tspan x="22" dy="1.2em"
-						class="st18">monitored via </tspan>epoll <tspan x="4" dy="1.212em" class="st17">·</tspan><tspan
-						class="st17"> </tspan><tspan class="st18">Commands include the </tspan><tspan x="22" dy="1.204em"
-						class="st18">virtual core to be modified</tspan><tspan class="st18">, </tspan><tspan x="22" dy="1.2em"
-						class="st18">using </tspan>libvirt <tspan class="st18">to get physical </tspan><tspan x="22" dy="1.2em"
-						class="st18">core mapping </tspan><tspan x="4" dy="1.212em" class="st17">·</tspan><tspan class="st17"> </tspan><tspan
-						class="st18">Uses librte</tspan><tspan class="st18">_</tspan><tspan class="st18">power to affect </tspan><tspan
-						x="22" dy="1.204em" class="st18">frequency changes via Linux </tspan><tspan x="22" dy="1.2em" class="st18">userspace power </tspan><tspan
-						x="22" dy="1.2em" class="st18">governor</tspan><tspan class="st18">(</tspan><tspan class="st18">APCI cpufreq</tspan><tspan
-						class="st18">) </tspan><tspan x="4" dy="1.212em" class="st17">·</tspan><tspan class="st17"> </tspan><tspan
-						class="st18">CLI</tspan><tspan class="st18">: </tspan><tspan class="st18">For adding VM channels </tspan><tspan
-						x="22" dy="1.204em" class="st18">to monitor</tspan><tspan class="st18">, </tspan><tspan class="st18">inspecting and </tspan><tspan
-						x="22" dy="1.2em" class="st18">changing channel state</tspan><tspan class="st18">, </tspan><tspan x="22"
-						dy="1.2em" class="st18">manually altering CPU </tspan><tspan x="22" dy="1.2em" class="st18">frequency</tspan><tspan
-						class="st18">. </tspan><tspan class="st18">Also allows for the </tspan><tspan x="22" dy="1.2em"
-						class="st18">changing of vCPU to pCPU </tspan><tspan x="22" dy="1.2em" class="st18">pinning</tspan><tspan
-						class="st18">.</tspan></text>		</g>
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-			<title>Box.53</title>
-			<desc>VM Power Monitor Application</desc>
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-			<title>Box.61</title>
-			<desc>librte_power(vm)</desc>
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-			<title>Box.48</title>
-			<desc>lcore channel 0</desc>
-			<g id="shadow48-353" transform="matrix(1,0,0,1,1.44,1.44)" class="st1">
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-			<text x="11.7" y="436.73" class="st11">lcore <tspan x="6.14" dy="1.2em" class="st14">channel  </tspan><tspan x="19.04"
-						dy="1.2em" class="st14">0</tspan></text>		</g>
-		<g id="shape47-361" transform="translate(245.072,-396.394)">
-			<title>Box.47</title>
-			<desc>librte_power(vm)</desc>
-			<g id="shadow47-362" transform="matrix(1,0,0,1,1.44,1.44)" class="st1">
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-			<title>Box.46</title>
-			<desc>lcore channel 1</desc>
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diff --git a/doc/guides/sample_app_ug/vm_power_management.rst b/doc/guides/sample_app_ug/vm_power_management.rst
index bb2aa4faf..b583da36c 100644
--- a/doc/guides/sample_app_ug/vm_power_management.rst
+++ b/doc/guides/sample_app_ug/vm_power_management.rst
@@ -1,71 +1,58 @@
 ..  SPDX-License-Identifier: BSD-3-Clause
     Copyright(c) 2010-2014 Intel Corporation.
 
-VM Power Management Application
-===============================
-
-Introduction
-------------
-
-Applications running in Virtual Environments have an abstract view of
-the underlying hardware on the Host, in particular applications cannot see
-the binding of virtual to physical hardware.
-When looking at CPU resourcing, the pinning of Virtual CPUs(vCPUs) to
-Host Physical CPUs(pCPUS) is not apparent to an application
-and this pinning may change over time.
-Furthermore, Operating Systems on virtual machines do not have the ability
-to govern their own power policy; the Machine Specific Registers (MSRs)
-for enabling P-State transitions are not exposed to Operating Systems
-running on Virtual Machines(VMs).
-
-The Virtual Machine Power Management solution shows an example of
-how a DPDK application can indicate its processing requirements using VM local
-only information(vCPU/lcore, etc.) to a Host based Monitor which is responsible
-for accepting requests for frequency changes for a vCPU, translating the vCPU
-to a pCPU via libvirt and affecting the change in frequency.
-
-The solution is comprised of two high-level components:
-
-#. Example Host Application
-
-   Using a Command Line Interface(CLI) for VM->Host communication channel management
-   allows adding channels to the Monitor, setting and querying the vCPU to pCPU pinning,
-   inspecting and manually changing the frequency for each CPU.
-   The CLI runs on a single lcore while the thread responsible for managing
-   VM requests runs on a second lcore.
-
-   VM requests arriving on a channel for frequency changes are passed
-   to the librte_power ACPI cpufreq sysfs based library.
-   The Host Application relies on both qemu-kvm and libvirt to function.
-
-   This monitoring application is responsible for:
-
-   - Accepting requests from client applications: Client applications can
-     request frequency changes for a vCPU, translating
-     the vCPU to a pCPU via libvirt and affecting the change in frequency.
-
-   - Accepting policies from client applications: Client application can
-     send a policy to the host application. The
-     host application will then apply the rules of the policy independent
-     of the application. For example, the policy can contain time-of-day
-     information for busy/quiet periods, and the host application can scale
-     up/down the relevant cores when required. See the details of the guest
-     application below for more information on setting the policy values.
-
-   - Out-of-band monitoring of workloads via cores hardware event counters:
-     The host application can manage power for an application in a virtualised
-     OR non-virtualised environment by looking at the event counters of the
-     cores and taking action based on the branch hit/miss ratio. See the host
-     application '--core-list' command line parameter below.
-
-#. librte_power for Virtual Machines
-
-   Using an alternate implementation for the librte_power API, requests for
-   frequency changes are forwarded to the host monitor rather than
-   the APCI cpufreq sysfs interface used on the host.
-
-   The l3fwd-power application will use this implementation when deployed on a VM
-   (see :doc:`l3_forward_power_man`).
+Virtual Machine Power Management Application
+============================================
+
+Applications running in virtual environments have an abstract view of
+the underlying hardware on the host. Specifically, applications cannot
+see the binding of virtual components to physical hardware. When looking
+at CPU resourcing, the pinning of Virtual CPUs (vCPUs) to Physical CPUs
+(pCPUs) on the host is not apparent to an application and this pinning
+may change over time. In addition, operating systems on Virtual Machines
+(VMs) do not have the ability to govern their own power policy. The
+Machine Specific Registers (MSRs) for enabling P-state transitions are
+not exposed to the operating systems running on the VMs.
+
+The solution demonstrated in this sample application shows an example of
+how a DPDK application can indicate its processing requirements using
+VM-local only information (vCPU/lcore, and so on) to a host resident VM
+Power Manager. The VM Power Manager is responsible for:
+
+- **Accepting requests for frequency changes for a vCPU**
+- **Translating the vCPU to a pCPU using libvirt**
+- **Performing the change in frequency**
+
+This application demonstrates the following features:
+
+- **The handling of VM application requests to change frequency.**
+  VM applications can request frequency changes for a vCPU. The VM
+  Power Management Application uses libvirt to translate that
+  virtual CPU (vCPU) request to a physical CPU (pCPU) request and
+  performs the frequency change.
+
+- **The acceptance of power management policies from VM applications.**
+  A VM application can send a policy to the host application. The
+  policy contains rules that define the power management behaviour
+  of the VM. The host application then applies the rules of the
+  policy independent of the VM application. For example, the
+  policy can contain time-of-day information for busy/quiet
+  periods, and the host application can scale up/down the relevant
+  cores when required. See :ref:`sending_policy` for information on
+  setting policy values.
+
+- **Out-of-band monitoring of workloads using core hardware event counters.**
+  The host application can manage power for an application by looking
+  at the event counters of the cores and taking action based on the
+  branch miss/hit ratio. See :ref:`enabling_out_of_band`.
+
+  **Note**: This functionality also applies in non-virtualised environments.
+
+In addition to the ``librte_power`` library used on the host, the
+application uses a special version of ``librte_power`` on each VM, which
+directs frequency changes and policies to the host monitor rather than
+the APCI ``cpufreq`` ``sysfs`` interface used on the host in non-virtualised
+environments.
 
 .. _figure_vm_power_mgr_highlevel:
 
@@ -73,47 +60,95 @@ The solution is comprised of two high-level components:
 
    Highlevel Solution
 
+In the above diagram, the DPDK Applications are shown running in
+virtual machines, and the VM Power Monitor application is shown running
+in the host.
+
+**DPDK VM Application**
+
+- Reuse ``librte_power`` interface, but uses an implementation that
+  forwards frequency requests to the host using a ``virtio-serial`` channel
+- Each lcore has exclusive access to a single channel
+- Sample application reuses ``l3fwd_power``
+- A CLI for changing frequency from within a VM is also included
+
+**VM Power Monitor**
+
+- Accepts VM commands over ``virtio-serial`` endpoints, monitored
+  using ``epoll``
+- Commands include the virtual core to be modified, using ``libvirt`` to get
+  the physical core mapping
+- Uses ``librte_power`` to affect frequency changes using Linux userspace
+  power governor (``acpi_cpufreq`` OR ``intel_pstate`` driver)
+- CLI: For adding VM channels to monitor, inspecting and changing channel
+  state, manually altering CPU frequency. Also allows for the changings
+  of vCPU to pCPU pinning
+
+Sample Application Architecture Overview
+----------------------------------------
+
+The VM power management solution employs ``qemu-kvm`` to provide
+communications channels between the host and VMs in the form of a
+``virtio-serial`` connection that appears as a para-virtualised serial
+device on a VM and can be configured to use various backends on the
+host. For this example, the configuration of each ``virtio-serial`` endpoint
+on the host as an ``AF_UNIX`` file socket, supporting poll/select and
+``epoll`` for event notification. In this example, each channel endpoint on
+the host is monitored for ``EPOLLIN`` events using ``epoll``. Each channel
+is specified as ``qemu-kvm`` arguments or as ``libvirt`` XML for each VM,
+where each VM can have several channels up to a maximum of 64 per VM. In this
+example, each DPDK lcore on a VM has exclusive access to a channel.
+
+To enable frequency changes from within a VM, the VM forwards a
+``librte_power`` request over the ``virtio-serial`` channel to the host. Each
+request contains the vCPU and power command (scale up/down/min/max). The
+API for the host ``librte_power`` and guest ``librte_power`` is consistent
+across environments, with the selection of VM or host implementation
+determined automatically at runtime based on the environment. On
+receiving a request, the host translates the vCPU to a pCPU using the
+libvirt API before forwarding it to the host ``librte_power``.
 
-Overview
---------
-
-VM Power Management employs qemu-kvm to provide communications channels
-between the host and VMs in the form of Virtio-Serial which appears as
-a paravirtualized serial device on a VM and can be configured to use
-various backends on the host. For this example each Virtio-Serial endpoint
-on the host is configured as AF_UNIX file socket, supporting poll/select
-and epoll for event notification.
-In this example each channel endpoint on the host is monitored via
-epoll for EPOLLIN events.
-Each channel is specified as qemu-kvm arguments or as libvirt XML for each VM,
-where each VM can have a number of channels up to a maximum of 64 per VM,
-in this example each DPDK lcore on a VM has exclusive access to a channel.
-
-To enable frequency changes from within a VM, a request via the librte_power interface
-is forwarded via Virtio-Serial to the host, each request contains the vCPU
-and power command(scale up/down/min/max).
-The API for host and guest librte_power is consistent across environments,
-with the selection of VM or Host Implementation determined at automatically
-at runtime based on the environment.
-
-Upon receiving a request, the host translates the vCPU to a pCPU via
-the libvirt API before forwarding to the host librte_power.
 
 .. _figure_vm_power_mgr_vm_request_seq:
 
 .. figure:: img/vm_power_mgr_vm_request_seq.*
 
-   VM request to scale frequency
-
+In addition to the ability to send power management requests to the
+host, a VM can send a power management policy to the host. In some
+cases, using a power management policy is a preferred option because it
+can eliminate possible latency issues that can occur when sending power
+management requests. Once the VM sends the policy to the host, the VM no
+longer needs to worry about power management, because the host now
+manages the power for the VM based on the policy. The policy can specify
+power behavior that is based on incoming traffic rates or time-of-day
+power adjustment (busy/quiet hour power adjustment for example). See
+:ref:`sending_policy` for more information.
+
+One method of power management is to sense how busy a core is when
+processing packets and adjusting power accordingly. One technique for
+doing this is to monitor the ratio of the branch miss to branch hits
+counters and scale the core power accordingly. This technique is based
+on the premise that when a core is not processing packets, the ratio of
+branch misses to branch hits is very low, but when the core is
+processing packets, it is measurably higher. The implementation of this
+capability is as a policy of type ``BRANCH_RATIO``.
+See :ref:`sending_policy` for more information on using the
+BRANCH_RATIO policy option.
+
+A JSON interface enables the specification of power management requests
+and policies in JSON format. The JSON interfaces provide a more
+convenient and more easily interpreted interface for the specification
+of requests and policies. See :ref:`power_man_requests` for more information.
 
 Performance Considerations
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-While Haswell Microarchitecture allows for independent power control for each core,
-earlier Microarchtectures do not offer such fine grained control.
-When deployed on pre-Haswell platforms greater care must be taken in selecting
-which cores are assigned to a VM, for instance a core will not scale down
-until its sibling is similarly scaled.
+While the Haswell microarchitecture allows for independent power control
+for each core, earlier microarchitectures do not offer such fine-grained
+control. When deploying on pre-Haswell platforms, greater care must be
+taken when selecting which cores are assigned to a VM, for example, a
+core does not scale down in frequency until all of its siblings are
+similarly scaled down.
 
 Configuration
 -------------
@@ -121,636 +156,541 @@ Configuration
 BIOS
 ~~~~
 
-Enhanced Intel SpeedStep® Technology must be enabled in the platform BIOS
-if the power management feature of DPDK is to be used.
-Otherwise, the sys file folder /sys/devices/system/cpu/cpu0/cpufreq will not exist,
-and the CPU frequency-based power management cannot be used.
-Consult the relevant BIOS documentation to determine how these settings
-can be accessed.
+To use the power management features of the DPDK, you must enable
+Enhanced Intel SpeedStep® Technology in the platform BIOS. Otherwise,
+the ``sys`` file folder ``/sys/devices/system/cpu/cpu0/cpufreq`` does not
+exist, and you cannot use CPU frequency-based power management. Refer to the
+relevant BIOS documentation to determine how to access these settings.
 
 Host Operating System
 ~~~~~~~~~~~~~~~~~~~~~
 
-The DPDK Power Library can use either the *acpi_cpufreq* or *intel_pstate*
-kernel driver for the management of core frequencies. In many cases
-the *intel_pstate* driver is the default Power Management environment.
+The DPDK Power Management library can use either the ``acpi_cpufreq`` or
+the ``intel_pstate`` kernel driver for the management of core frequencies. In
+many cases, the ``intel_pstate`` driver is the default power management
+environment.
 
-Should the *acpi-cpufreq* driver be required, the *intel_pstate* module must
-be disabled, and *apci_cpufreq* module loaded in its place.
+Should the ``acpi-cpufreq driver`` be required, the ``intel_pstate``
+module must be disabled, and the ``acpi-cpufreq`` module loaded in its place.
 
-To disable *intel_pstate* driver, add the following to the grub Linux
-command line:
+To disable the ``intel_pstate`` driver, add the following to the ``grub``
+Linux command line:
 
-.. code-block:: console
-
-  intel_pstate=disable
+   ``intel_pstate=disable``
 
-Upon rebooting, load the *acpi_cpufreq* module:
+On reboot, load the ``acpi_cpufreq`` module:
 
-.. code-block:: console
-
-  modprobe acpi_cpufreq
+   ``modprobe acpi_cpufreq``
 
 Hypervisor Channel Configuration
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Virtio-Serial channels are configured via libvirt XML:
-
-
-.. code-block:: xml
+Configure ``virtio-serial`` channels using ``libvirt`` XML.
+The XML structure is as follows: 
 
-  <name>{vm_name}</name>
-  <controller type='virtio-serial' index='0'>
-    <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
-  </controller>
-  <channel type='unix'>
-    <source mode='bind' path='/tmp/powermonitor/{vm_name}.{channel_num}'/>
-    <target type='virtio' name='virtio.serial.port.poweragent.{vm_channel_num}'/>
-    <address type='virtio-serial' controller='0' bus='0' port='{N}'/>
-  </channel>
+.. code-block:: XML
 
+   <name>{vm_name}</name>
+   <controller type='virtio-serial' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
+   </controller>
+   <channel type='unix'>
+      <source mode='bind' path='/tmp/powermonitor/{vm_name}.{channel_num}'/>
+      <target type='virtio' name='virtio.serial.port.poweragent.{vm_channel_num}'/>
+      <address type='virtio-serial' controller='0' bus='0' port='{N}'/>
+   </channel>
 
-Where a single controller of type *virtio-serial* is created and up to 32 channels
-can be associated with a single controller and multiple controllers can be specified.
-The convention is to use the name of the VM in the host path *{vm_name}* and
-to increment *{channel_num}* for each channel, likewise the port value *{N}*
-must be incremented for each channel.
+Where a single controller of type ``virtio-serial`` is created, up to 32
+channels can be associated with a single controller, and multiple
+controllers can be specified. The convention is to use the name of the
+VM in the host path ``{vm_name}`` and to increment ``{channel_num}`` for each
+channel. Likewise, the port value ``{N}`` must be incremented for each
+channel.
 
-Each channel on the host will appear in *path*, the directory */tmp/powermonitor/*
-must first be created and given qemu permissions
+On the host, for each channel to appear in the path, ensure the creation
+of the ``/tmp/powermonitor/`` directory and the assignment of ``qemu``
+permissions:
 
 .. code-block:: console
 
-  mkdir /tmp/powermonitor/
-  chown qemu:qemu /tmp/powermonitor
+   mkdir /tmp/powermonitor/
+   chown qemu:qemu /tmp/powermonitor
 
-Note that files and directories within /tmp are generally removed upon
-rebooting the host and the above steps may need to be carried out after each reboot.
+Note that files and directories in ``/tmp`` are generally removed when
+rebooting the host and you may need to perform the previous steps after
+each reboot.
 
-The serial device as it appears on a VM is configured with the *target* element attribute *name*
-and must be in the form of *virtio.serial.port.poweragent.{vm_channel_num}*,
-where *vm_channel_num* is typically the lcore channel to be used in DPDK VM applications.
+The serial device as it appears on a VM is configured with the target
+element attribute name and must be in the form:
+``virtio.serial.port.poweragent.{vm_channel_num}``, where
+``vm_channel_num`` is typically the lcore channel to be used in
+DPDK VM applications.
 
-Each channel on a VM will be present at */dev/virtio-ports/virtio.serial.port.poweragent.{vm_channel_num}*
+Each channel on a VM is present at:
+
+``/dev/virtio-ports/virtio.serial.port.poweragent.{vm_channel_num}``
 
 Compiling and Running the Host Application
 ------------------------------------------
 
-Compiling
-~~~~~~~~~
+Compiling the Host Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-For information on compiling DPDK and the sample applications
+For information on compiling the DPDK and sample applications, see
 see :doc:`compiling`.
 
-The application is located in the ``vm_power_manager`` sub-directory.
+The application is located in the ``vm_power_manager`` subdirectory.
 
 To build just the ``vm_power_manager`` application using ``make``:
 
 .. code-block:: console
 
-  export RTE_SDK=/path/to/rte_sdk
-  export RTE_TARGET=build
-  cd ${RTE_SDK}/examples/vm_power_manager/
-  make
+   export RTE_SDK=/path/to/rte_sdk
+   export RTE_TARGET=build
+   cd ${RTE_SDK}/examples/vm_power_manager/
+   make
 
-The resulting binary will be ${RTE_SDK}/build/examples/vm_power_manager
+The resulting binary is ``${RTE_SDK}/build/examples/vm_power_manager``.
 
-To build just the ``vm_power_manager`` application using ``meson/ninja``:
+To build just the ``vm_power_manager`` application using ``meson``/``ninja``:
 
 .. code-block:: console
 
-  export RTE_SDK=/path/to/rte_sdk
-  cd ${RTE_SDK}
-  meson build
-  cd build
-  ninja
-  meson configure -Dexamples=vm_power_manager
-  ninja
+   export RTE_SDK=/path/to/rte_sdk
+   cd ${RTE_SDK}
+   meson build
+   cd build
+   ninja
+   meson configure -Dexamples=vm_power_manager
+   ninja
 
-The resulting binary will be ${RTE_SDK}/build/examples/dpdk-vm_power_manager
+The resulting binary is ``${RTE_SDK}/build/examples/dpdk-vm_power_manager``.
 
-Running
-~~~~~~~
+Running the Host Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-The application does not have any specific command line options other than *EAL*:
+The application does not have any specific command line options other
+than the EAL options:
 
 .. code-block:: console
 
- ./build/vm_power_mgr [EAL options]
+   ./build/vm_power_mgr [EAL options]
 
-The application requires exactly two cores to run, one core is dedicated to the CLI,
-while the other is dedicated to the channel endpoint monitor, for example to run
-on cores 0 & 1 on a system with 4 memory channels:
+The application requires exactly two cores to run. One core for the CLI
+and the other for the channel endpoint monitor. For example, to run on
+cores 0 and 1 on a system with four memory channels, issue the command:
 
 .. code-block:: console
 
- ./build/vm_power_mgr -l 0-1 -n 4
+   ./build/vm_power_mgr -l 0-1 -n 4
 
-After successful initialization the user is presented with VM Power Manager CLI:
+After successful initialization, the VM Power Manager CLI prompt appears:
 
 .. code-block:: console
 
-  vm_power>
+   vm_power>
 
-Virtual Machines can now be added to the VM Power Manager:
+Now, it is possible to add virtual machines to the VM Power Manager:
 
 .. code-block:: console
 
-  vm_power> add_vm {vm_name}
-
-When a {vm_name} is specified with the *add_vm* command a lookup is performed
-with libvirt to ensure that the VM exists, {vm_name} is used as an unique identifier
-to associate channels with a particular VM and for executing operations on a VM within the CLI.
-VMs do not have to be running in order to add them.
-
-A number of commands can be issued via the CLI in relation to VMs:
+   vm_power> add_vm {vm_name}
 
-  Remove a Virtual Machine identified by {vm_name} from the VM Power Manager.
+When a ``{vm_name}`` is specified with the ``add_vm`` command, a lookup is
+performed with ``libvirt`` to ensure that the VM exists. ``{vm_name}`` is a
+unique identifier to associate channels with a particular VM and for
+executing operations on a VM within the CLI. VMs do not have to be
+running to add them.
 
-  .. code-block:: console
-
-    rm_vm {vm_name}
-
-  Add communication channels for the specified VM, the virtio channels must be enabled
-  in the VM configuration(qemu/libvirt) and the associated VM must be active.
-  {list} is a comma-separated list of channel numbers to add, using the keyword 'all'
-  will attempt to add all channels for the VM:
-
-  .. code-block:: console
-
-    add_channels {vm_name} {list}|all
-
-  Enable or disable the communication channels in {list}(comma-separated)
-  for the specified VM, alternatively list can be replaced with keyword 'all'.
-  Disabled channels will still receive packets on the host, however the commands
-  they specify will be ignored. Set status to 'enabled' to begin processing requests again:
-
-  .. code-block:: console
-
-    set_channel_status {vm_name} {list}|all enabled|disabled
-
-  Print to the CLI the information on the specified VM, the information
-  lists the number of vCPUS, the pinning to pCPU(s) as a bit mask, along with
-  any communication channels associated with each VM, along with the status of each channel:
-
-  .. code-block:: console
+It is possible to issue several commands from the CLI to manage VMs.
 
-    show_vm {vm_name}
+Remove the virtual machine identified by ``{vm_name}`` from the VM Power
+Manager using the command:
 
-  Set the binding of Virtual CPU on VM with name {vm_name}  to the Physical CPU mask:
-
-  .. code-block:: console
+.. code-block:: console
 
-    set_pcpu_mask {vm_name} {vcpu} {pcpu}
+   rm_vm {vm_name}
 
-  Set the binding of Virtual CPU on VM to the Physical CPU:
+Add communication channels for the specified VM using the following
+command. The ``virtio`` channels must be enabled in the VM configuration
+(``qemu/libvirt``) and the associated VM must be active. ``{list}`` is a
+comma-separated list of channel numbers to add. Specifying the keyword
+``all`` attempts to add all channels for the VM:
 
-  .. code-block:: console
+.. code-block:: console
 
-    set_pcpu {vm_name} {vcpu} {pcpu}
+   set_pcpu {vm_name} {vcpu} {pcpu}
 
   Enable query of physical core information from a VM:
 
-  .. code-block:: console
+.. code-block:: console
 
-    set_query {vm_name} enable|disable
+   set_query {vm_name} enable|disable
 
 Manual control and inspection can also be carried in relation CPU frequency scaling:
 
   Get the current frequency for each core specified in the mask:
 
-  .. code-block:: console
+.. code-block:: console
 
-    show_cpu_freq_mask {mask}
+   show_cpu_freq_mask {mask}
 
   Set the current frequency for the cores specified in {core_mask} by scaling each up/down/min/max:
 
-  .. code-block:: console
-
-    set_cpu_freq {core_mask} up|down|min|max
+.. code-block:: console
 
-  Get the current frequency for the specified core:
+   add_channels {vm_name} {list}|all
 
-  .. code-block:: console
+Enable or disable the communication channels in ``{list}`` (comma-separated)
+for the specified VM. Alternatively, replace ``list`` with the keyword
+``all``. Disabled channels receive packets on the host. However, the commands
+they specify are ignored. Set the status to enabled to begin processing
+requests again:
 
-    show_cpu_freq {core_num}
+.. code-block:: console
 
-  Set the current frequency for the specified core by scaling up/down/min/max:
+   set_channel_status {vm_name} {list}|all enabled|disabled
 
-  .. code-block:: console
+Print to the CLI information on the specified VM. The information lists
+the number of vCPUs, the pinning to pCPU(s) as a bit mask, along with
+any communication channels associated with each VM, and the status of
+each channel:
 
-    set_cpu_freq {core_num} up|down|min|max
+.. code-block:: console
 
-There are also some command line parameters for enabling the out-of-band
-monitoring of branch ratio on cores doing busy polling via PMDs.
+   show_vm {vm_name}
 
-  .. code-block:: console
+Set the binding of a virtual CPU on a VM with name ``{vm_name}`` to the
+physical CPU mask:
 
-    --core-list {list of cores}
+.. code-block:: console
 
-  When this parameter is used, the list of cores specified will monitor the ratio
-  between branch hits and branch misses. A tightly polling PMD thread will have a
-  very low branch ratio, so the core frequency will be scaled down to the minimum
-  allowed value. When packets are received, the code path will alter, causing the
-  branch ratio to increase. When the ratio goes above the ratio threshold, the
-  core frequency will be scaled up to the maximum allowed value.
+   set_pcpu_mask {vm_name} {vcpu} {pcpu}
 
+Set the binding of the virtual CPU on the VM to the physical CPU:
+ 
   .. code-block:: console
 
-    --branch-ratio {ratio}
-
-  The branch ratio is a floating point number that specifies the threshold at which
-  to scale up or down for the given workload. The default branch ratio is 0.01,
-  and will need to be adjusted for different workloads.
-
-
-
-JSON API
-~~~~~~~~
-
-In addition to the command line interface for host command and a virtio-serial
-interface for VM power policies, there is also a JSON interface through which
-power commands and policies can be sent. This functionality adds a dependency
-on the Jansson library, and the Jansson development package must be installed
-on the system before the JSON parsing functionality is included in the app.
-This is achieved by:
-
-  .. code-block:: javascript
-
-    apt-get install libjansson-dev
+   set_pcpu {vm_name} {vcpu} {pcpu}
 
-The command and package name may be different depending on your operating
-system. It's worth noting that the app will successfully build without this
-package present, but a warning is shown during compilation, and the JSON
-parsing functionality will not be present in the app.
+It is also possible to perform manual control and inspection in relation
+to CPU frequency scaling.
 
-Sending a command or policy to the power manager application is achieved by
-simply opening a fifo file, writing a JSON string to that fifo, and closing
-the file. In actual implementation every core has own dedicated fifo[0..n],
-where n is number of the last available core.
-Having a dedicated fifo file per core allows using standard filesystem permissions
-to ensure a given container can only write JSON commands into fifos it is allowed
-to use.
+Get the current frequency for each core specified in the mask:
 
-The fifo is at /tmp/powermonitor/fifo[0..n]
-
-For example all cmds put to the /tmp/powermonitor/fifo7, will have
-effect only on CPU[7].
-
-The JSON string can be a policy or instruction, and takes the following
-format:
-
-  .. code-block:: javascript
-
-    {"packet_type": {
-      "pair_1": value,
-      "pair_2": value
-    }}
-
-The 'packet_type' header can contain one of two values, depending on
-whether a policy or power command is being sent. The two possible values are
-"policy" and "instruction", and the expected name-value pairs is different
-depending on which type is being sent.
-
-The pairs are the format of standard JSON name-value pairs. The value type
-varies between the different name/value pairs, and may be integers, strings,
-arrays, etc. Examples of policies follow later in this document. The allowed
-names and value types are as follows:
-
-
-:Pair Name: "command"
-:Description: The type of packet we're sending to the power manager. We can be
-  creating or destroying a policy, or sending a direct command to adjust
-  the frequency of a core, similar to the command line interface.
-:Type: string
-:Values:
-
-  :CREATE: used when creating a new policy,
-  :DESTROY: used when removing a policy,
-  :POWER: used when sending an immediate command, max, min, etc.
-:Required: yes
-:Example:
+.. code-block:: console
 
-    .. code-block:: javascript
+   show_cpu_freq_mask {mask}
 
-      "command", "CREATE"
+Set the current frequency for the cores specified in ``{core_mask}`` by
+scaling each up/down/min/max:
 
+.. code-block:: console
 
-:Pair Name: "policy_type"
-:Description: Type of policy to apply. Please see vm_power_manager documentation
-  for more information on the types of policies that may be used.
-:Type: string
-:Values:
+   set_cpu_freq {core_mask} up|down|min|max
 
-  :TIME: Time-of-day policy. Frequencies of the relevant cores are
-    scaled up/down depending on busy and quiet hours.
-  :TRAFFIC: This policy takes statistics from the NIC and scales up
-    and down accordingly.
-  :WORKLOAD: This policy looks at how heavily loaded the cores are,
-    and scales up and down accordingly.
-  :BRANCH_RATIO: This out-of-band policy can look at the ratio between
-    branch hits and misses on a core, and is useful for detecting
-    how much packet processing a core is doing.
-:Required: only for CREATE/DESTROY command
-:Example:
+Get the current frequency for the specified core:
 
-  .. code-block:: javascript
+.. code-block:: console
 
-    "policy_type", "TIME"
+   show_cpu_freq {core_num}
 
-:Pair Name: "busy_hours"
-:Description: The hours of the day in which we scale up the cores for busy
-  times.
-:Type: array of integers
-:Values: array with list of hour numbers, (0-23)
-:Required: only for TIME policy
-:Example:
-
-  .. code-block:: javascript
-
-    "busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ]
-
-:Pair Name: "quiet_hours"
-:Description: The hours of the day in which we scale down the cores for quiet
-  times.
-:Type: array of integers
-:Values: array with list of hour numbers, (0-23)
-:Required: only for TIME policy
-:Example:
+Set the current frequency for the specified core by scaling up/down/min/max:
 
-  .. code-block:: javascript
+.. code-block:: console
 
-    "quiet_hours":[ 2, 3, 4, 5, 6 ]
+   set_cpu_freq {core_num} up|down|min|max
 
-:Pair Name: "avg_packet_thresh"
-:Description: Threshold below which the frequency will be set to min for
-  the TRAFFIC policy. If the traffic rate is above this and below max, the
-  frequency will be set to medium.
-:Type: integer
-:Values: The number of packets below which the TRAFFIC policy applies the
-  minimum frequency, or medium frequency if between avg and max thresholds.
-:Required: only for TRAFFIC policy
-:Example:
+.. _enabling_out_of_band:
 
-  .. code-block:: javascript
+Command Line Options for Enabling Out-of-band Branch Ratio Monitoring
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-    "avg_packet_thresh": 100000
+There are a couple of command line parameters for enabling the out-of-band
+monitoring of branch ratios on cores doing busy polling using PMDs as
+described in the following table.
 
-:Pair Name: "max_packet_thresh"
-:Description: Threshold above which the frequency will be set to max for
-  the TRAFFIC policy
-:Type: integer
-:Values: The number of packets per interval above which the TRAFFIC policy
-  applies the maximum frequency
-:Required: only for TRAFFIC policy
-:Example:
+Table 1 – Command Line Options for Enabling Out-of-band Monitoring of
+Branch Ratios
 
-  .. code-block:: javascript
+=============================== ==============================================
+**Command Line Option**         **Description**
+=============================== ==============================================
+``--core-list {list of cores}`` | Specify the list of cores to monitor the ratio of branch misses
+                                | to branch hits.  A tightly-polling PMD thread has a very low
+                                | branch ratio, therefore the core frequency scales down to the
+                                | minimum allowed value. On receiving packets, the code path changes,
+                                | causing the branch ratio to increase. When the ratio goes above
+                                | the ratio threshold, the core frequency scales up to the maximum
+                                | allowed value.
+``--branch-ratio {ratio}``      | Specify a floating-point number that identifies the threshold at which
+                                | to scale up or down for the given workload. The default branch ratio
+                                | is 0.01 and needs adjustment for different workloads.
+=============================== ==============================================
 
-    "max_packet_thresh": 500000
 
-:Pair Name: "workload"
-:Description: When our policy is of type WORKLOAD, we need to specify how
-  heavy our workload is.
-:Type: string
-:Values:
 
-  :HIGH: For cores running workloads that require high frequencies
-  :MEDIUM: For cores running workloads that require medium frequencies
-  :LOW: For cores running workloads that require low frequencies
-:Required: only for WORKLOAD policy types
-:Example:
+Compiling and Running the Guest Applications
+--------------------------------------------
 
-  .. code-block:: javascript
+It is possible to use the ``l3fwd-power`` application (for example) with the
+``vm_power_manager``.
 
-    "workload", "MEDIUM"
+The distribution also provides a guest CLI for validating the setup.
 
-:Pair Name: "mac_list"
-:Description: When our policy is of type TRAFFIC, we need to specify the
-  MAC addresses that the host needs to monitor
-:Type: string
-:Values: array with a list of mac address strings.
-:Required: only for TRAFFIC policy types
-:Example:
+For both ``l3fwd-power`` and the guest CLI, the host application must use
+the ``add_channels`` command to monitor the channels for the VM. To do this,
+issue the following commands in the host application:
 
-  .. code-block:: javascript
+.. code-block:: console
 
-    "mac_list":[ "de:ad:be:ef:01:01", "de:ad:be:ef:01:02" ]
+   vm_power> add_vm vmname
+   vm_power> add_channels vmname all
+   vm_power> set_channel_status vmname all enabled
+   vm_power> show_vm vmname
 
-:Pair Name: "unit"
-:Description: the type of power operation to apply in the command
-:Type: string
-:Values:
+Compiling the Guest Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-  :SCALE_MAX: Scale frequency of this core to maximum
-  :SCALE_MIN: Scale frequency of this core to minimum
-  :SCALE_UP: Scale up frequency of this core
-  :SCALE_DOWN: Scale down frequency of this core
-  :ENABLE_TURBO: Enable Turbo Boost for this core
-  :DISABLE_TURBO: Disable Turbo Boost for this core
-:Required: only for POWER instruction
-:Example:
+For information on compiling DPDK and the sample applications in general,
+see :doc:`compiling`.
 
-  .. code-block:: javascript
+For compiling and running the ``l3fwd-power`` sample application, see
+:doc:`l3_forward_power_man`.
 
-    "unit", "SCALE_MAX"
+The application is in the ``guest_cli`` subdirectory under ``vm_power_manager``.
 
-JSON API Examples
-~~~~~~~~~~~~~~~~~
+To build just the ``guest_vm_power_manager`` application using ``make``, issue
+the following commands:
 
-Profile create example:
+.. code-block:: console
 
-  .. code-block:: javascript
+   export RTE_SDK=/path/to/rte_sdk
+   export RTE_TARGET=build
+   cd ${RTE_SDK}/examples/vm_power_manager/guest_cli/
+   make
 
-    {"policy": {
-      "command": "create",
-      "policy_type": "TIME",
-      "busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ],
-      "quiet_hours":[ 2, 3, 4, 5, 6 ]
-    }}
+The resulting binary is ``${RTE_SDK}/build/examples/guest_cli``.
 
-Profile destroy example:
+**Note**: This sample application conditionally links in the Jansson JSON
+library. Consequently, if you are using a multilib or cross-compile
+environment, you may need to set the ``PKG_CONFIG_LIBDIR`` environmental
+variable to point to the relevant ``pkgconfig`` folder so that the correct
+library is linked in.
 
-  .. code-block:: javascript
+For example, if you are building for a 32-bit target, you could find the
+correct directory using the following find command:
 
-    {"policy": {
-      "command": "destroy"
-    }}
+.. code-block:: console
 
-Power command example:
+   # find /usr -type d -name pkgconfig
+   /usr/lib/i386-linux-gnu/pkgconfig
+   /usr/lib/x86_64-linux-gnu/pkgconfig
 
-  .. code-block:: javascript
+Then use:
 
-    {"instruction": {
-      "command": "power",
-      "unit": "SCALE_MAX"
-    }}
+.. code-block:: console
 
-To send a JSON string to the Power Manager application, simply paste the
-example JSON string into a text file and cat it into the proper fifo:
+   export PKG_CONFIG_LIBDIR=/usr/lib/i386-linux-gnu/pkgconfig
 
-  .. code-block:: console
+You then use the ``make`` command as normal, which should find the 32-bit
+version of the library, if it installed. If not, the application builds
+without the JSON interface functionality.
 
-    cat file.json >/tmp/powermonitor/fifo[0..n]
+To build just the ``vm_power_manager`` application using ``meson``/``ninja``:
 
-The console of the Power Manager application should indicate the command that
-was just received via the fifo.
+.. code-block:: console
 
-Compiling and Running the Guest Applications
---------------------------------------------
+   export RTE_SDK=/path/to/rte_sdk
+   cd ${RTE_SDK}
+   meson build
+   cd build
+   ninja
+   meson configure -Dexamples=vm_power_manager/guest_cli
+   ninja
 
-l3fwd-power is one sample application that can be used with vm_power_manager.
+The resulting binary is ``${RTE_SDK}/build/examples/guest_cli``.
 
-A guest CLI is also provided for validating the setup.
+Running the Guest Application
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-For both l3fwd-power and guest CLI, the channels for the VM must be monitored by the
-host application using the *add_channels* command on the host. This typically uses
-the following commands in the host application:
+The standard EAL command line parameters are necessary:
 
 .. code-block:: console
 
-  vm_power> add_vm vmname
-  vm_power> add_channels vmname all
-  vm_power> set_channel_status vmname all enabled
-  vm_power> show_vm vmname
-
+   ./build/vm_power_mgr [EAL options] -- [guest options]
 
-Compiling
-~~~~~~~~~
+The guest example uses a channel for each lcore enabled. For example, to
+run on cores 0, 1, 2 and 3:
 
-For information on compiling DPDK and the sample applications
-see :doc:`compiling`.
+.. code-block:: console
 
-For compiling and running l3fwd-power, see :doc:`l3_forward_power_man`.
+   ./build/guest_vm_power_mgr -l 0-3
 
-The application is located in the ``guest_cli`` sub-directory under ``vm_power_manager``.
+.. _sending_policy:
 
-To build just the ``guest_vm_power_manager`` application using ``make``:
+Command Line Options Available When Sending a Policy to the Host
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-.. code-block:: console
+Optionally, there are several command line options for a user who needs
+to send a power policy to the host application. The following table
+describes these options.
 
-  export RTE_SDK=/path/to/rte_sdk
-  export RTE_TARGET=build
-  cd ${RTE_SDK}/examples/vm_power_manager/guest_cli/
-  make
+Table 1 – Command Line Options Available When Sending a Policy to the Host
 
-The resulting binary will be ${RTE_SDK}/build/examples/guest_cli
+======================================= ======================================
+**Command Line Option**                 **Description**
+======================================= ======================================
+``--vm-name {name of guest vm}``        | Allows the user to change the virtual machine name passed
+                                        | down to the host application using the power policy. The
+                                        | default is ubuntu2.
+``--vcpu-list {list vm cores}``         | A comma-separated list of cores in the VM that the user
+                                        | wants the host application to monitor. The list of cores
+                                        | in any vm starts at zero, and the host application maps
+                                        | these to the physical cores once the policy passes down
+                                        | to the host. Valid syntax includes individual cores
+                                        | 2,3,4, a range of cores 2-4, or a combination of both
+                                        | 1,3,5-7.
+``--busy-hours {list of busy hours}``   | A comma-separated list of hours in which to set the core
+                                        | frequency to the maximum. Valid syntax includes
+                                        | individual hours 2,3,4, a range of hours 2-4, or a
+                                        | combination of both 1,3,5-7. Valid hour values are 0 to 23.
+``--quiet-hours {list of quiet hours}`` | A comma-separated list of hours in which to set the core
+                                        | frequency to minimum. Valid syntax includes individual
+                                        | hours 2,3,4, a range of hours 2-4, or a combination of
+                                        | both 1,3,5-7. Valid hour values are 0 to 23.
+``--policy {policy type}``              | The type of policy. This can be one of the following values:
 
-.. Note::
-  This sample application conditionally links in the Jansson JSON
-  library, so if you are using a multilib or cross compile environment you
-  may need to set the ``PKG_CONFIG_LIBDIR`` environmental variable to point to
-  the relevant pkgconfig folder so that the correct library is linked in.
+                                        - | TRAFFIC Based on incoming traffic rates on the NIC.
 
-  For example, if you are building for a 32-bit target, you could find the
-  correct directory using the following ``find`` command:
+                                        - | TIME - Uses a busy/quiet hours policy.
 
-  .. code-block:: console
+                                        - | BRANCH_RATIO - Uses branch ratio counters to determine
+                                          | core busyness.
 
-      # find /usr -type d -name pkgconfig
-      /usr/lib/i386-linux-gnu/pkgconfig
-      /usr/lib/x86_64-linux-gnu/pkgconfig
+                                        - | WORKLOAD - Sets the frequency to low, medium or high
+                                          | based on the received policy setting.
 
-  Then use:
+                                        | **Note**: Not all policy types need all parameters. For
+                                        |           example, BRANCH_RATIO only needs the vcpu-list
+                                        |           parameter.
+======================================= ======================================
 
-  .. code-block:: console
+After successful initialization, the VM Power Manager Guest CLI prompt
+appears:
 
-      export PKG_CONFIG_LIBDIR=/usr/lib/i386-linux-gnu/pkgconfig
+.. code-block:: console
 
-  You then use the make command as normal, which should find the 32-bit
-  version of the library, if it installed. If not, the application will
-  be built without the JSON interface functionality.
+   vm_power(guest)>
 
-To build just the ``vm_power_manager`` application using ``meson/ninja``:
+To change the frequency of an lcore, use a ``set_cpu_freq`` command similar
+to the following:
 
 .. code-block:: console
 
-  export RTE_SDK=/path/to/rte_sdk
-  cd ${RTE_SDK}
-  meson build
-  cd build
-  ninja
-  meson configure -Dexamples=vm_power_manager/guest_cli
-  ninja
-
-The resulting binary will be ${RTE_SDK}/build/examples/guest_cli
+   set_cpu_freq {core_num} up|down|min|max
 
-Running
-~~~~~~~
+where, ``{core_num}`` is the lcore and channel to change frequency by
+scaling up/down/min/max.
 
-The standard *EAL* command line parameters are required:
+To start an application, configure the power policy, and send it to the
+host, use a command like the following:
 
 .. code-block:: console
 
- ./build/guest_vm_power_mgr [EAL options] -- [guest options]
+   ./build/guest_vm_power_mgr -l 0-3 -n 4 -- --vm-name=ubuntu --policy=BRANCH_RATIO --vcpu-list=2-4
 
-The guest example uses a channel for each lcore enabled. For example,
-to run on cores 0,1,2,3:
+Once the VM Power Manager Guest CLI appears, issuing the 'send_policy now' command
+will send the policy to the host:
 
 .. code-block:: console
 
- ./build/guest_vm_power_mgr -l 0-3
-
-Optionally, there is a list of command line parameter should the user wish to send a power
-policy down to the host application. These parameters are as follows:
+  send_policy now
 
-  .. code-block:: console
+Once the policy is sent to the host, the host application takes over the power monitoring
+of the specified cores in the policy.
 
-    --vm-name {name of guest vm}
+.. _power_man_requests:
 
-  This parameter allows the user to change the Virtual Machine name passed down to the
-  host application via the power policy. The default is "ubuntu2"
+JSON Interface for Power Management Requests and Policies
+---------------------------------------------------------
 
-  .. code-block:: console
+In addition to the command line interface for the host command, and a
+``virtio-serial`` interface for VM power policies, there is also a JSON
+interface through which power commands and policies can be sent.
 
-    --vcpu-list {list vm cores}
+**Note**: This functionality adds a dependency on the Jansson library.
+Install the Jansson development package on the system to avail of the
+JSON parsing functionality in the app. Issue the ``apt-get install
+libjansson-dev`` command to install the development package. The command
+and package name may be different depending on your operating system. It
+is worth noting that the app builds successfully if this package is not
+present, but a warning displays during compilation, and the JSON parsing
+functionality is not present in the app.
 
-  A comma-separated list of cores in the VM that the user wants the host application to
-  monitor. The list of cores in any vm starts at zero, and these are mapped to the
-  physical cores by the host application once the policy is passed down.
-  Valid syntax includes individual cores '2,3,4', or a range of cores '2-4', or a
-  combination of both '1,3,5-7'
+Send a request or policy to the VM Power Manager by simply opening a
+fifo file at ``/tmp/powermonitor/fifo``, writing a JSON string to that file,
+and closing the file.
 
-  .. code-block:: console
+The JSON string can be a power management request or a policy, and takes
+the following format:
 
-    --busy-hours {list of busy hours}
+.. code-block:: javascript
 
-  A comma-separated list of hours within which to set the core frequency to maximum.
-  Valid syntax includes individual hours '2,3,4', or a range of hours '2-4', or a
-  combination of both '1,3,5-7'. Valid hours are 0 to 23.
+   {"packet_type": {
+   "pair_1": value,
+   "pair_2": value
+   }}
 
-  .. code-block:: console
+The ``packet_type`` header can contain one of two values, depending on
+whether a power management request or policy is being sent. The two
+possible values are ``instruction`` and ``policy`` and the expected name-value
+pairs are different depending on which type is sent.
 
-    --quiet-hours {list of quiet hours}
+The pairs are in the format of standard JSON name-value pairs. The value
+type varies between the different name-value pairs, and may be integers,
+strings, arrays, and so on. See :ref:`json_interface_ex`
+for examples of policies and instructions and
+:ref:`json_name_value_pair` for the supported names and value types.
 
-  A comma-separated list of hours within which to set the core frequency to minimum.
-  Valid syntax includes individual hours '2,3,4', or a range of hours '2-4', or a
-  combination of both '1,3,5-7'. Valid hours are 0 to 23.
+.. _json_interface_ex:
 
-  .. code-block:: console
+JSON Interface Examples
+~~~~~~~~~~~~~~~~~~~~~~~
 
-    --policy {policy type}
+The following is an example JSON string that creates a time-profile
+policy.
 
-  The type of policy. This can be one of the following values:
-  TRAFFIC - based on incoming traffic rates on the NIC.
-  TIME - busy/quiet hours policy.
-  BRANCH_RATIO - uses branch ratio counters to determine core busyness.
-  Not all parameters are needed for all policy types. For example, BRANCH_RATIO
-  only needs the vcpu-list parameter, not any of the hours.
+.. code-block:: JSON
 
+   {"policy": {
+   "name": "ubuntu",
+   "command": "create",
+   "policy_type": "TIME",
+   "busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ],
+   "quiet_hours":[ 2, 3, 4, 5, 6 ],
+   "core_list":[ 11 ]
+   }}
 
-After successful initialization the user is presented with VM Power Manager Guest CLI:
+The following is an example JSON string that removes the named policy.
 
-.. code-block:: console
+.. code-block:: JSON
 
-  vm_power(guest)>
+   {"policy": {
+   "name": "ubuntu",
+   "command": "destroy",
+   }}
 
-To change the frequency of a lcore, use the set_cpu_freq command.
-Where {core_num} is the lcore and channel to change frequency by scaling up/down/min/max.
+The following is an example JSON string for a power management request.
 
-.. code-block:: console
+.. code-block:: JSON
 
-  set_cpu_freq {core_num} up|down|min|max
+   {"instruction": {
+   "name": "ubuntu",
+   "command": "power",
+   "unit": "SCALE_MAX",
+   "resource_id": 10
+   }}
 
 To query the available frequences of an lcore, use the query_cpu_freq command.
 Where {core_num} is the lcore to query.
@@ -783,3 +723,215 @@ will send the policy to the host:
 
 Once the policy is sent to the host, the host application takes over the power monitoring
 of the specified cores in the policy.
+
+.. _json_name_value_pair:
+
+JSON Name-value Pairs
+~~~~~~~~~~~~~~~~~~~~~
+
+The following are the name-value pairs supported by the JSON interface:
+
+-  `avg_packet_thresh`_
+-  `busy_hours`_
+-  `command`_
+-  `core_list`_
+-  `mac_list`_
+-  `max_packet_thresh`_
+-  `name`_
+-  `policy_type`_
+-  `quiet_hours`_
+-  `resource_id`_
+-  `unit`_
+-  `workload`_
+
+avg_packet_thresh
+^^^^^^^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "avg_packet_thresh"
+================== ===========================================================
+ **Description:**   | The threshold below which the frequency is set to the minimum value for the
+                    | TRAFFIC policy. If the traffic rate is above this value and below the
+                    | maximum value, the frequency is set to medium.
+ **Type:**          integer
+ **Values:**        | The number of packets below which the TRAFFIC policy applies the minimum
+                    | frequency, or the medium frequency if between the average and maximum
+                    | thresholds.
+ **Required:**      Yes
+ **Example:**       ``"avg_packet_thresh": 100000``
+================== ===========================================================
+
+busy_hours
+^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "busy_hours"
+================== ===========================================================
+ **Description:**   The hours of the day in which we scale up the cores for busy times.
+ **Type:**          array of integers
+ **Values:**        An array with a list of hour values (0-23).
+ **Required:**      For the TIME policy only.
+ **Example:**       ``"busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ]``
+================== ===========================================================
+
+command
+^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "command"
+================== ===========================================================
+ **Description:**   | The type of packet to send to the VM Power Manager. It is possible to create
+                    | or destroy a policy or send a direct command to adjust the frequency of a core,
+                    | as is possible on the command line interface.
+ **Type:**          | string
+ **Values:**        Possible values are:
+
+                    - CREATE: Create a new policy.
+                    - DESTROY: Remove an existing policy.
+                    - POWER: Send an immediate command, max, min, and so on.
+
+ **Required:**       Yes
+ **Example:**        ``"command": "CREATE"``
+================== ===========================================================
+
+core_list
+^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "core_list"
+================== ===========================================================
+ **Description:**   The cores to which to apply a policy.
+ **Type:**          array of integers
+ **Values:**        An array with a list of virtual CPUs.
+ **Required:**      For CREATE/DESTROY policy requests only.
+ **Example:**       ``"core_list":[ 10, 11 ]``
+================== ===========================================================
+
+mac_list
+^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "mac_list"
+================== ===========================================================
+ **Description:**   | When the policy is of type TRAFFIC, it is necessary to specify the MAC addresses
+                    | that the host must monitor.
+ **Type:**          | array of strings
+ **Values:**        An array with a list of mac address strings.
+ **Required:**      For TRAFFIC policy types only.
+ **Example:**       ``"mac_list":[ "de:ad:be:ef:01:01","de:ad:be:ef:01:02" ]``
+================== ===========================================================
+
+
+max_packet_thresh
+^^^^^^^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "max_packet_thresh"
+================== ===========================================================
+ **Description:**   | In a policy of type TRAFFIC, the threshold value above which the frequency is set
+                    | to a maximum.
+ **Type:**          | integer
+ **Values:**        | The number of packets per interval above which the TRAFFIC
+                    | policy applies the maximum frequency.
+ **Required:**      For the TRAFFIC policy only.
+ **Example:**       ``"max_packet_thresh": 500000``
+================== ===========================================================
+
+name
+^^^^
+
+================== ===========================================================
+ **Pair Name:**     "name"
+================== ===========================================================
+ **Description:**   | The name of the VM or host. Allows the parser to associate the policy with the
+                    | relevant VM or host OS.
+ **Type:**          | string
+ **Values:**        Any valid string.
+ **Required:**      Yes
+ **Example:**       ``"name": "ubuntu2"``
+================== ===========================================================
+
+policy_type
+^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "policy_type"
+================== ===========================================================
+ **Description:**   | The type of policy to apply. See the ``--policy`` option description for more
+                    | information.
+ **Type:**          string
+ **Values:**        Possible values are:
+
+                    - | TIME: Time-of-day policy. Scale the frequencies of the relevant cores up/down
+                      | depending on busy and quiet hours.
+                    - | TRAFFIC: Use statistics from the NIC and scale up and down accordingly.
+                    - | WORKLOAD: Determine how heavily loaded the cores are and scale up and down
+                      | accordingly.
+                    - | BRANCH_RATIO: An out-of-band policy that looks at the ratio between branch
+                      | hits and misses on a core and uses that information to determine how much
+                      | packet processing a core is doing.
+
+ **Required:**       For ``CREATE`` and ``DESTROY`` policy requests only.
+ **Example:**        ``"policy_type": "TIME"``
+================== ===========================================================
+
+quiet_hours
+^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "quiet_hours"
+================== ===========================================================
+ **Description:**   | The hours of the day to scale down the cores for quiet times.
+ **Type:**          array of integers
+ **Values:**        | An array with a list of hour numbers with values in the range 0 to 23.
+ **Required:**      For the TIME policy only.
+ **Example:**       ``"quiet_hours":[ 2, 3, 4, 5, 6 ]``
+================== ===========================================================
+
+resource_id
+^^^^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "resource_id"
+================== ===========================================================
+ **Description:**   The core to which to apply a power command.
+ **Type:**          integer
+ **Values:**        A valid core ID for the VM or host OS.
+ **Required:**      For the ``POWER`` instruction only.
+ **Example:**       ``"resource_id": 10``
+================== ===========================================================
+
+unit
+^^^^
+
+================== ===========================================================
+ **Pair Name:**     "unit"
+================== ===========================================================
+ **Description:**   The type of power operation to apply in the command.
+ **Type:**          string
+ **Values:**         - SCALE_MAX: Scale the frequency of this core to the maximum.
+                     - SCALE_MIN: Scale the frequency of this core to the minimum.
+                     - SCALE_UP: Scale up the frequency of this core.
+                     - SCALE_DOWN: Scale down the frequency of this core.
+                     - ENABLE_TURBO: Enable Intel® Turbo Boost Technology for this core.
+                     - DISABLE_TURBO: Disable Intel® Turbo Boost Technology for this core.
+ **Required:**      For the ``POWER`` instruction only.
+ **Example:**       ``"unit": "SCALE_MAX"``
+================== ===========================================================
+
+workload
+^^^^^^^^
+
+================== ===========================================================
+ **Pair Name:**     "workload"
+================== ===========================================================
+ **Description:**   In a policy of type WORKLOAD, it is necessary to specify
+                    how heavy the workload is.
+ **Type:**          string
+ **Values:**         - HIGH: Scale the frequency of this core to maximum.
+                     - MEDIUM: Scale the frequency of this core to minimum.
+                     - LOW: Scale up the frequency of this core.
+ **Required:**       For the ``WORKLOAD`` policy only.
+ **Example:**        ``"workload": "MEDIUM"``
+================== ===========================================================
+
-- 
2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [dpdk-dev] [PATCH v2] doc: rework vm power manager user guide
  2020-02-17 10:48 ` [dpdk-dev] [PATCH v2] " David Hunt
@ 2020-02-21 18:02   ` Thomas Monjalon
  2020-02-25 16:46   ` Ferruh Yigit
  1 sibling, 0 replies; 8+ messages in thread
From: Thomas Monjalon @ 2020-02-21 18:02 UTC (permalink / raw)
  To: David Hunt; +Cc: dev, john.mcnamara

17/02/2020 11:48, David Hunt:
> Review and re-work of vm_power_manager documentation. Hopefully this
> is clearer, easier to follow.
> 
> Signed-off-by: David Hunt <david.hunt@intel.com>
> 
> ---
> changes in v2
> * Fixed typos. Typos not found even with checkpatch from kernel 5.5.4, but
>   when the codespell package is installed, the typos are magically
>   revealed!
> * Moved the text blocks from within the high level image out into normal
>   text for easier future maintenance.

Applied, thanks



^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [dpdk-dev] [PATCH v2] doc: rework vm power manager user guide
  2020-02-17 10:48 ` [dpdk-dev] [PATCH v2] " David Hunt
  2020-02-21 18:02   ` Thomas Monjalon
@ 2020-02-25 16:46   ` Ferruh Yigit
  2020-02-25 16:59     ` Thomas Monjalon
  1 sibling, 1 reply; 8+ messages in thread
From: Ferruh Yigit @ 2020-02-25 16:46 UTC (permalink / raw)
  To: David Hunt, dev
  Cc: john.mcnamara, Bernard Iremonger, Thomas Monjalon,
	David Marchand, Bruce Richardson

On 2/17/2020 10:48 AM, David Hunt wrote:
> Review and re-work of vm_power_manager documentation. Hopefully this
> is clearer, easier to follow.
> 
> Signed-off-by: David Hunt <david.hunt@intel.com>
> 
> ---
> changes in v2
> * Fixed typos. Typos not found even with checkpatch from kernel 5.5.4, but
>   when the codespell package is installed, the typos are magically
>   revealed!
> * Moved the text blocks from within the high level image out into normal
>   text for easier future maintenance.
> ---
>  .../img/vm_power_mgr_highlevel.svg            | 2043 +++++++++++------
>  .../img/vm_power_mgr_vm_request_seq.svg       | 1455 +++++-------
>  .../sample_app_ug/vm_power_management.rst     | 1216 +++++-----
>  3 files changed, 2653 insertions(+), 2061 deletions(-)
> 

<...>

Bernard reported following errors [1] in DPDK 20.02-rc4 caused by this patch,
while building the docs in Ubuntu with "Sphinx (sphinx-build) 1.3.6".

I can't reproduce it with "sphinx-build 1.8.5" on Ubuntu, or with "sphinx-build
2.3.1" on Fedora.

I am putting this as a record, not sure if something needs to be done.

@John, do we have a minimum required sphinx version required?



[1]
.../doc/guides/sample_app_ug/vm_power_management.rst:420: ERROR: Malformed table.
Column span alignment problem in table line 5.

.../doc/guides/sample_app_ug/vm_power_management.rst:545: ERROR: Malformed table.
Column span alignment problem in table line 5.

.../doc/guides/sample_app_ug/vm_power_management.rst:754: ERROR: Malformed table.
Column span alignment problem in table line 5.

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [dpdk-dev] [PATCH v2] doc: rework vm power manager user guide
  2020-02-25 16:46   ` Ferruh Yigit
@ 2020-02-25 16:59     ` Thomas Monjalon
  2020-02-25 17:47       ` Thomas Monjalon
  0 siblings, 1 reply; 8+ messages in thread
From: Thomas Monjalon @ 2020-02-25 16:59 UTC (permalink / raw)
  To: David Hunt, Ferruh Yigit, john.mcnamara, Bernard Iremonger
  Cc: dev, David Marchand, Bruce Richardson

25/02/2020 17:46, Ferruh Yigit:
> On 2/17/2020 10:48 AM, David Hunt wrote:
> > Review and re-work of vm_power_manager documentation. Hopefully this
> > is clearer, easier to follow.
> > 
> > Signed-off-by: David Hunt <david.hunt@intel.com>
> <...>
> 
> Bernard reported following errors [1] in DPDK 20.02-rc4 caused by this patch,
> while building the docs in Ubuntu with "Sphinx (sphinx-build) 1.3.6".
> 
> I can't reproduce it with "sphinx-build 1.8.5" on Ubuntu, or with "sphinx-build
> 2.3.1" on Fedora.
> 
> I am putting this as a record, not sure if something needs to be done.
> 
> @John, do we have a minimum required sphinx version required?
> 
> 
> 
> [1]
> .../doc/guides/sample_app_ug/vm_power_management.rst:420: ERROR: Malformed table.
> Column span alignment problem in table line 5.
> 
> .../doc/guides/sample_app_ug/vm_power_management.rst:545: ERROR: Malformed table.
> Column span alignment problem in table line 5.
> 
> .../doc/guides/sample_app_ug/vm_power_management.rst:754: ERROR: Malformed table.
> Column span alignment problem in table line 5.


Thank you for reporting.
I was testing PDF on the server at the same time and discovered this issue.

We should avoid big tables.
Here the table have only two columns so they can be formatted differently.
One option is to use the definition lists:
	https://docutils.sourceforge.io/docs/user/rst/quickref.html#definition-lists

Please could we have a fix very quickly?
It is a blocker for the release (planned to be done in the next hour).





^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [dpdk-dev] [PATCH v2] doc: rework vm power manager user guide
  2020-02-25 16:59     ` Thomas Monjalon
@ 2020-02-25 17:47       ` Thomas Monjalon
  0 siblings, 0 replies; 8+ messages in thread
From: Thomas Monjalon @ 2020-02-25 17:47 UTC (permalink / raw)
  To: David Hunt, john.mcnamara, marko.kovacevic
  Cc: Ferruh Yigit, Bernard Iremonger, dev, David Marchand,
	Bruce Richardson, techboard

25/02/2020 17:59, Thomas Monjalon:
> 25/02/2020 17:46, Ferruh Yigit:
> > On 2/17/2020 10:48 AM, David Hunt wrote:
> > > Review and re-work of vm_power_manager documentation. Hopefully this
> > > is clearer, easier to follow.
> > > 
> > > Signed-off-by: David Hunt <david.hunt@intel.com>
> > <...>
> > 
> > Bernard reported following errors [1] in DPDK 20.02-rc4 caused by this patch,
> > while building the docs in Ubuntu with "Sphinx (sphinx-build) 1.3.6".
> > 
> > I can't reproduce it with "sphinx-build 1.8.5" on Ubuntu, or with "sphinx-build
> > 2.3.1" on Fedora.
> > 
> > I am putting this as a record, not sure if something needs to be done.
> > 
> > @John, do we have a minimum required sphinx version required?
> > 
> > 
> > 
> > [1]
> > .../doc/guides/sample_app_ug/vm_power_management.rst:420: ERROR: Malformed table.
> > Column span alignment problem in table line 5.
> > 
> > .../doc/guides/sample_app_ug/vm_power_management.rst:545: ERROR: Malformed table.
> > Column span alignment problem in table line 5.
> > 
> > .../doc/guides/sample_app_ug/vm_power_management.rst:754: ERROR: Malformed table.
> > Column span alignment problem in table line 5.
> 
> 
> Thank you for reporting.
> I was testing PDF on the server at the same time and discovered this issue.
> 
> We should avoid big tables.
> Here the table have only two columns so they can be formatted differently.
> One option is to use the definition lists:
> 	https://docutils.sourceforge.io/docs/user/rst/quickref.html#definition-lists
> 
> Please could we have a fix very quickly?
> It is a blocker for the release (planned to be done in the next hour).

I did the fix myself.

I think we must talk about having a doc maintainer, really.




^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2020-02-25 17:47 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-01-07  9:13 [dpdk-dev] [PATCH v1] doc: rework vm power manager user guide David Hunt
2020-02-16 11:13 ` Thomas Monjalon
2020-02-17 10:44   ` Hunt, David
2020-02-17 10:48 ` [dpdk-dev] [PATCH v2] " David Hunt
2020-02-21 18:02   ` Thomas Monjalon
2020-02-25 16:46   ` Ferruh Yigit
2020-02-25 16:59     ` Thomas Monjalon
2020-02-25 17:47       ` Thomas Monjalon

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