1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(c) 2017 Intel Corporation.
4 Eventdev Pipeline Sample Application
5 ====================================
7 The eventdev pipeline sample application is a sample app that demonstrates
8 the usage of the eventdev API using the software PMD. It shows how an
9 application can configure a pipeline and assign a set of worker cores to
10 perform the processing required.
12 The application has a range of command line arguments allowing it to be
13 configured for various numbers worker cores, stages,queue depths and cycles per
14 stage of work. This is useful for performance testing as well as quickly testing
15 a particular pipeline configuration.
18 Compiling the Application
19 -------------------------
21 To compile the sample application see :doc:`compiling`.
23 The application is located in the ``examples`` sub-directory.
27 Running the Application
28 -----------------------
30 The application has a lot of command line options. This allows specification of
31 the eventdev PMD to use, and a number of attributes of the processing pipeline
34 An example eventdev pipeline running with the software eventdev PMD using
35 these settings is shown below:
37 * ``-r1``: core mask 0x1 for RX
38 * ``-t1``: core mask 0x1 for TX
39 * ``-e4``: core mask 0x4 for the software scheduler
40 * ``-w FF00``: core mask for worker cores, 8 cores from 8th to 16th
41 * ``-s4``: 4 atomic stages
42 * ``-n0``: process infinite packets (run forever)
43 * ``-c32``: worker dequeue depth of 32
44 * ``-W1000``: do 1000 cycles of work per packet in each stage
45 * ``-D``: dump statistics on exit
47 .. code-block:: console
49 ./build/eventdev_pipeline --vdev event_sw0 -- -r1 -t1 -e4 -w FF00 -s4 -n0 -c32 -W1000 -D
51 The application has some sanity checking built-in, so if there is a function
52 (eg; the RX core) which doesn't have a cpu core mask assigned, the application
53 will print an error message:
55 .. code-block:: console
57 Core part of pipeline was not assigned any cores. This will stall the
58 pipeline, please check core masks (use -h for details on setting core masks):
62 Configuration of the eventdev is covered in detail in the programmers guide,
63 see the Event Device Library section.
66 Observing the Application
67 -------------------------
69 At runtime the eventdev pipeline application prints out a summary of the
70 configuration, and some runtime statistics like packets per second. On exit the
71 worker statistics are printed, along with a full dump of the PMD statistics if
72 required. The following sections show sample output for each of the output
78 This provides an overview of the pipeline,
79 scheduling type at each stage, and parameters to options such as how many
80 flows to use and what eventdev PMD is in use. See the following sample output
83 .. code-block:: console
96 Stage 0, Type Atomic Priority = 128
97 Stage 1, Type Atomic Priority = 128
98 Stage 2, Type Atomic Priority = 128
99 Stage 3, Type Atomic Priority = 128
104 At runtime, the statistics of the consumer are printed, stating the number of
105 packets received, runtime in milliseconds, average mpps, and current mpps.
107 .. code-block:: console
109 # consumer RX= xxxxxxx, time yyyy ms, avg z.zzz mpps [current w.www mpps]
114 At shutdown, the application prints the number of packets received and
115 transmitted, and an overview of the distribution of work across worker cores.
117 .. code-block:: console
119 Signal 2 received, preparing to exit...
120 worker 12 thread done. RX=4966581 TX=4966581
121 worker 13 thread done. RX=4963329 TX=4963329
122 worker 14 thread done. RX=4953614 TX=4953614
123 worker 0 thread done. RX=0 TX=0
124 worker 11 thread done. RX=4970549 TX=4970549
125 worker 10 thread done. RX=4986391 TX=4986391
126 worker 9 thread done. RX=4970528 TX=4970528
127 worker 15 thread done. RX=4974087 TX=4974087
128 worker 8 thread done. RX=4979908 TX=4979908
129 worker 2 thread done. RX=0 TX=0
131 Port Workload distribution:
132 worker 0 : 12.5 % (4979876 pkts)
133 worker 1 : 12.5 % (4970497 pkts)
134 worker 2 : 12.5 % (4986359 pkts)
135 worker 3 : 12.5 % (4970517 pkts)
136 worker 4 : 12.5 % (4966566 pkts)
137 worker 5 : 12.5 % (4963297 pkts)
138 worker 6 : 12.5 % (4953598 pkts)
139 worker 7 : 12.5 % (4974055 pkts)
141 To get a full dump of the state of the eventdev PMD, pass the ``-D`` flag to
142 this application. When the app is terminated using ``Ctrl+C``, the
143 ``rte_event_dev_dump()`` function is called, resulting in a dump of the
144 statistics that the PMD provides. The statistics provided depend on the PMD
145 used, see the Event Device Drivers section for a list of eventdev PMDs.