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

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

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-Packet Latency
---------------
-
-TRex Traffic Generator (TG) is used for measuring latency of VPP DUTs.
-Reported latency values are measured using following methodology:
-
-- Latency tests are performed at 100% of discovered NDR and PDR rates
-  for each throughput test and packet size (except IMIX).
-- TG sends dedicated latency streams, one per direction, each at the
-  rate of 9 kpps at the prescribed packet size; these are sent in
-  addition to the main load streams.
-- TG reports min/avg/max latency values per stream direction, hence two
-  sets of latency values are reported per test case; future release of
-  TRex is expected to report latency percentiles.
-- Reported latency values are aggregate across two SUTs due to three
-  node topology used for all performance tests; for per SUT latency,
-  reported value should be divided by two.
-- 1usec is the measurement accuracy advertised by TRex TG for the setup
-  used in FD.io labs used by CSIT project.
-- TRex setup introduces an always-on error of about 2*2usec per latency
-  flow additonal Tx/Rx interface latency induced by TRex SW writing and
-  reading packet timestamps on CPU cores without HW acceleration on NICs
-  closer to the interface line.