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.. BSD LICENSE
Copyright(c) 2017 Intel Corporation. All rights reserved.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Eventdev Pipeline SW PMD Sample Application
===========================================
The eventdev pipeline sample application is a sample app that demonstrates
the usage of the eventdev API using the software PMD. It shows how an
application can configure a pipeline and assign a set of worker cores to
perform the processing required.
The application has a range of command line arguments allowing it to be
configured for various numbers worker cores, stages,queue depths and cycles per
stage of work. This is useful for performance testing as well as quickly testing
a particular pipeline configuration.
Compiling the Application
-------------------------
To compile the application:
#. Go to the sample application directory:
.. code-block:: console
export RTE_SDK=/path/to/rte_sdk
cd ${RTE_SDK}/examples/eventdev_pipeline_sw_pmd
#. Set the target (a default target is used if not specified). For example:
.. code-block:: console
export RTE_TARGET=x86_64-native-linuxapp-gcc
See the *DPDK Getting Started Guide* for possible RTE_TARGET values.
#. Build the application:
.. code-block:: console
make
Running the Application
-----------------------
The application has a lot of command line options. This allows specification of
the eventdev PMD to use, and a number of attributes of the processing pipeline
options.
An example eventdev pipeline running with the software eventdev PMD using
these settings is shown below:
* ``-r1``: core mask 0x1 for RX
* ``-t1``: core mask 0x1 for TX
* ``-e4``: core mask 0x4 for the software scheduler
* ``-w FF00``: core mask for worker cores, 8 cores from 8th to 16th
* ``-s4``: 4 atomic stages
* ``-n0``: process infinite packets (run forever)
* ``-c32``: worker dequeue depth of 32
* ``-W1000``: do 1000 cycles of work per packet in each stage
* ``-D``: dump statistics on exit
.. code-block:: console
./build/eventdev_pipeline_sw_pmd --vdev event_sw0 -- -r1 -t1 -e4 -w FF00 -s4 -n0 -c32 -W1000 -D
The application has some sanity checking built-in, so if there is a function
(eg; the RX core) which doesn't have a cpu core mask assigned, the application
will print an error message:
.. code-block:: console
Core part of pipeline was not assigned any cores. This will stall the
pipeline, please check core masks (use -h for details on setting core masks):
rx: 0
tx: 1
Configuration of the eventdev is covered in detail in the programmers guide,
see the Event Device Library section.
Observing the Application
-------------------------
At runtime the eventdev pipeline application prints out a summary of the
configuration, and some runtime statistics like packets per second. On exit the
worker statistics are printed, along with a full dump of the PMD statistics if
required. The following sections show sample output for each of the output
types.
Configuration
~~~~~~~~~~~~~
This provides an overview of the pipeline,
scheduling type at each stage, and parameters to options such as how many
flows to use and what eventdev PMD is in use. See the following sample output
for details:
.. code-block:: console
Config:
ports: 2
workers: 8
packets: 0
priorities: 1
Queue-prio: 0
qid0 type: atomic
Cores available: 44
Cores used: 10
Eventdev 0: event_sw
Stages:
Stage 0, Type Atomic Priority = 128
Stage 1, Type Atomic Priority = 128
Stage 2, Type Atomic Priority = 128
Stage 3, Type Atomic Priority = 128
Runtime
~~~~~~~
At runtime, the statistics of the consumer are printed, stating the number of
packets received, runtime in milliseconds, average mpps, and current mpps.
.. code-block:: console
# consumer RX= xxxxxxx, time yyyy ms, avg z.zzz mpps [current w.www mpps]
Shutdown
~~~~~~~~
At shutdown, the application prints the number of packets received and
transmitted, and an overview of the distribution of work across worker cores.
.. code-block:: console
Signal 2 received, preparing to exit...
worker 12 thread done. RX=4966581 TX=4966581
worker 13 thread done. RX=4963329 TX=4963329
worker 14 thread done. RX=4953614 TX=4953614
worker 0 thread done. RX=0 TX=0
worker 11 thread done. RX=4970549 TX=4970549
worker 10 thread done. RX=4986391 TX=4986391
worker 9 thread done. RX=4970528 TX=4970528
worker 15 thread done. RX=4974087 TX=4974087
worker 8 thread done. RX=4979908 TX=4979908
worker 2 thread done. RX=0 TX=0
Port Workload distribution:
worker 0 : 12.5 % (4979876 pkts)
worker 1 : 12.5 % (4970497 pkts)
worker 2 : 12.5 % (4986359 pkts)
worker 3 : 12.5 % (4970517 pkts)
worker 4 : 12.5 % (4966566 pkts)
worker 5 : 12.5 % (4963297 pkts)
worker 6 : 12.5 % (4953598 pkts)
worker 7 : 12.5 % (4974055 pkts)
To get a full dump of the state of the eventdev PMD, pass the ``-D`` flag to
this application. When the app is terminated using ``Ctrl+C``, the
``rte_event_dev_dump()`` function is called, resulting in a dump of the
statistics that the PMD provides. The statistics provided depend on the PMD
used, see the Event Device Drivers section for a list of eventdev PMDs.
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