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X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR07MB2446 Subject: Re: [dpdk-dev] [PATCH v5] ether: add support for vtune task tracing X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <http://dpdk.org/ml/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://dpdk.org/ml/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <http://dpdk.org/ml/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> X-List-Received-Date: Mon, 24 Jul 2017 09:28:01 -0000 -----Original Message----- > Date: Wed, 19 Jul 2017 11:54:45 +0300 > From: ilia.kurakin@intel.com > To: dev@dpdk.org > CC: jerin.jacob@caviumnetworks.com, konstantin.ananyev@intel.com, > keith.wiles@intel.com, dmitry.galanov@intel.com, Ilia Kurakin > <ilia.kurakin@intel.com> > Subject: [PATCH v5] ether: add support for vtune task tracing > X-Mailer: git-send-email 2.7.4 > > From: Ilia Kurakin <ilia.kurakin@intel.com> > > The patch adds tracing of loop iterations that yielded no packets in a DPDK > application. It is using ITT task API: > https://software.intel.com/en-us/node/544206 > > We suppose the flow of using this tracing would assume the user has ITT lib > and header on machine and re-build DPDK with additional make parameters: > > make EXTRA_CFLAGS=-I<path to ittnotify.h> > EXTRA_LDLIBS="-L<path to libittnotify.a> -littnotify" > > Signed-off-by: Ilia Kurakin <ilia.kurakin@intel.com> Found a checkpatch issue. ➜ [master][dpdk.org] $ ./devtools/checkpatches.sh ### ether: add support for vtune task tracing ERROR:SPACING: need consistent spacing around '*' (ctx:WxV) #173: FILE: lib/librte_ether/rte_ethdev_profile.c:59: + __itt_domain *domains[RTE_MAX_QUEUES_PER_PORT]; ^ ERROR:SPACING: need consistent spacing around '*' (ctx:WxV) #177: FILE: lib/librte_ether/rte_ethdev_profile.c:63: + __itt_string_handle *handles[RTE_MAX_QUEUES_PER_PORT]; ^ total: 2 errors, 0 warnings, 278 lines checked 0/1 valid patch > > --- > > -V2 change: > ITT tasks collection is moved to rx callback > > -V3 change: > rte_ethdev_profile.c created, all profile specific code moved there. > > Added generic profile function > > -V4 change: > checkpatch issues fixed > > Added documentation topic > > -V5 change: > Documentation fixes > > > config/common_base | 1 + > doc/guides/prog_guide/profile_app.rst | 34 ++++++++ > lib/librte_ether/Makefile | 1 + > lib/librte_ether/rte_ethdev.c | 4 + > lib/librte_ether/rte_ethdev_profile.c | 156 ++++++++++++++++++++++++++++++++++ > lib/librte_ether/rte_ethdev_profile.h | 52 ++++++++++++ > 6 files changed, 248 insertions(+) > create mode 100644 lib/librte_ether/rte_ethdev_profile.c > create mode 100644 lib/librte_ether/rte_ethdev_profile.h > > diff --git a/config/common_base b/config/common_base > index 8ae6e92..dda51db 100644 > --- a/config/common_base > +++ b/config/common_base > @@ -136,6 +136,7 @@ CONFIG_RTE_MAX_QUEUES_PER_PORT=1024 > CONFIG_RTE_LIBRTE_IEEE1588=n > CONFIG_RTE_ETHDEV_QUEUE_STAT_CNTRS=16 > CONFIG_RTE_ETHDEV_RXTX_CALLBACKS=y > +CONFIG_RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS=n > > # > # Turn off Tx preparation stage > diff --git a/doc/guides/prog_guide/profile_app.rst b/doc/guides/prog_guide/profile_app.rst > index 54b546a..590cb72 100644 > --- a/doc/guides/prog_guide/profile_app.rst > +++ b/doc/guides/prog_guide/profile_app.rst > @@ -59,6 +59,40 @@ Refer to the > for details about application profiling. > > > +Profiling wasted iterations with ITT > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + > +Iterations that yielded no RX packets (wasted loop iterations) can be analyzed > +using Intel® VTune\ :sup:`TM` Amplifier. This profiling employs the > +`Instrumentation and Tracing Technology (ITT) API > +<https://software.intel.com/en-us/node/544195>`_ > +feature of VTune Amplifier and requires only reconfiguring of DPDK library, > +no changes in a DPDK application are needed. > + > +To trace wasted iterations on RX queues, first reconfigure DPDK with > +``CONFIG_RTE_ETHDEV_RXTX_CALLBACKS`` and > +``CONFIG_RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS`` enabled. > + > +Then rebuild DPDK, specifying paths to the ITT header and library, which can > +be found in any VTune Amplifier distribution in the *include* and *lib* > +directories respectively: > + > +.. code-block:: console > + > + make EXTRA_CFLAGS=-I<path to ittnotify.h> \ > + EXTRA_LDLIBS="-L<path to libittnotify.a> -littnotify" > + > +Finally, to see wasted iterations in your performance analysis results, > +select the *"Analyze user tasks, events, and counters"* checkbox in the > +*"Analysis Type"* tab when configuring analysis via VTune Amplifier GUI. > +Alternatively, when running VTune Amplifier via command line, specify > +``-knob enable-user-tasks=true`` option. > + > +Collected regions of wasted iterations will be marked on VTune Amplifier's > +timeline as ITT tasks. These ITT tasks have predefined names, containing > +Ethernet device and RX queue identifiers. Documentation changes could move to different patch for better review. > diff --git a/lib/librte_ether/rte_ethdev_profile.h b/lib/librte_ether/rte_ethdev_profile.h > new file mode 100644 > index 0000000..1eb72bd > +/** > + * Initialization of profiling RX queues for the Ethernet device. > + * Implementation of this function depends on chosen profiling method, > + * defined in configs. > + * > + * @param port_id > + * The port identifier of the Ethernet device. > + * @param dev > + * Pointer to struct rte_eth_dev corresponding to given port_id. > + */ > +void > +rte_eth_profile_rx_init(uint8_t port_id, struct rte_eth_dev *dev); better to prefix __ for internal function(i.e __rte_eth_profile_rx_init) With above suggested changes: Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com> > + > +#endif > -- > 2.7.4 > > > -------------------------------------------------------------------- > Joint Stock Company Intel A/O > Registered legal address: Krylatsky Hills Business Park, > 17 Krylatskaya Str., Bldg 4, Moscow 121614, > Russian Federation > > This e-mail and any attachments may contain confidential material for > the sole use of the intended recipient(s). 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