DPDK patches and discussions
 help / color / mirror / Atom feed
From: Rory Sexton <rory.sexton@intel.com>
To: dev@dpdk.org, david.hunt@intel.com
Subject: [dpdk-dev] [v4 3/3] doc: update vm_power_manager cmdline options in doc
Date: Tue, 14 Jul 2020 17:02:00 +0100
Message-ID: <20200714160200.1727417-3-rory.sexton@intel.com> (raw)
In-Reply-To: <20200714160200.1727417-1-rory.sexton@intel.com>

Updating the vm_power_manager docs to reflect changes made in
previous patches in set.

Signed-off-by: Rory Sexton <rory.sexton@intel.com>
Reviewed-by: David Hunt <david.hunt@intel.com>

---
v4: no changes
---
 doc/guides/sample_app_ug/vm_power_management.rst | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/doc/guides/sample_app_ug/vm_power_management.rst b/doc/guides/sample_app_ug/vm_power_management.rst
index e98277ccb..1b6de8e93 100644
--- a/doc/guides/sample_app_ug/vm_power_management.rst
+++ b/doc/guides/sample_app_ug/vm_power_management.rst
@@ -410,19 +410,21 @@ 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 below:
 
-``--core-list {list of cores}``
+``--core-branch-ratio {list of cores}:{branch ratio for listed 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.
+   allowed value. The specified branch-ratio is a floating point number
+   that identifies the threshold at which to scale up or down for the
+   elements of the core-list. If not included the default branch ratio of
+   0.01 but will need adjustment for different workloads
+
+   This parameter can be used multiple times for different sets of cores.
+   The branch ratio mechanism can also be useful for non-PMD cores and
+   hyper-threaded environments where C-States are disabled.
 
 
 Compiling and Running the Guest Applications
-- 
2.25.1


  parent reply	other threads:[~2020-07-14 16:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14 16:01 [dpdk-dev] [v4 1/3] examples/vm_power_manager: Make branch ratio threshold per core Rory Sexton
2020-07-14 16:01 ` [dpdk-dev] [v4 2/3] examples/vm_power_manager: Allowing power managing of idle cores Rory Sexton
2020-07-15 15:09   ` Pattan, Reshma
2020-07-14 16:02 ` Rory Sexton [this message]
2020-07-15 15:15   ` [dpdk-dev] [v4 3/3] doc: update vm_power_manager cmdline options in doc Pattan, Reshma
2020-07-17 12:31   ` Thomas Monjalon
2020-07-15 15:08 ` [dpdk-dev] [v4 1/3] examples/vm_power_manager: Make branch ratio threshold per core Pattan, Reshma
2020-07-17 12:40   ` Thomas Monjalon
2020-07-20 10:26     ` Sexton, Rory

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200714160200.1727417-3-rory.sexton@intel.com \
    --to=rory.sexton@intel.com \
    --cc=david.hunt@intel.com \
    --cc=dev@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git