Revert "fix(jobspec): Delete ipsec nfv density tests"

[csit.git] / docs / report / introduction / methodology_trex_traffic_generator.rst

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-TRex Traffic Generator
-----------------------
-
-Usage
-~~~~~
-
-`TRex traffic generator <https://wiki.fd.io/view/TRex>`_ is used for all
-CSIT performance tests. TRex stateless mode is used to measure NDR and
-PDR throughputs using MLRsearch and to measure maximum transer rate
-in MRR tests.
-
-TRex is installed and run on the TG compute node. The typical procedure
-is:
-
-- If the TRex is not already installed on TG, it is installed in the
-  suite setup phase - see `TRex installation`_.
-- TRex configuration is set in its configuration file
-  ::
-
-  /etc/trex_cfg.yaml
-
-- TRex is started in the background mode
-  ::
-
-  $ sh -c 'cd <t-rex-install-dir>/scripts/ && sudo nohup ./t-rex-64 -i -c 7 --prefix $(hostname) --hdrh > /tmp/trex.log 2>&1 &' > /dev/null
-
-- There are traffic streams dynamically prepared for each test, based on traffic
-  profiles. The traffic is sent and the statistics obtained using
-  :command:`trex.stl.api.STLClient`.
-
-Measuring Packet Loss
-~~~~~~~~~~~~~~~~~~~~~
-
-Following sequence is followed to measure packet loss:
-
-- Create an instance of STLClient.
-- Connect to the client.
-- Add all streams.
-- Clear statistics.
-- Send the traffic for defined time.
-- Get the statistics.
-
-If there is a warm-up phase required, the traffic is sent also before
-test and the statistics are ignored.
-
-Measuring Latency
-~~~~~~~~~~~~~~~~~
-
-If measurement of latency is requested, two more packet streams are
-created (one for each direction) with TRex flow_stats parameter set to
-STLFlowLatencyStats. In that case, returned statistics will also include
-min/avg/max latency values.