+++ /dev/null
-Packet Latency
---------------
-
-TRex Traffic Generator (TG) is used for measuring latency across 2-Node
-and 3-Node SUT server topologies. TRex integrates `A High Dynamic Range
-Histogram (HDRH) <http://hdrhistogram.org/>`_ code providing per packet
-latency distribution for latency streams sent in parallel to the main
-load packet streams. Packet latency is measured using following
-methodology:
-
-- Latency tests are performed at following packet load levels:
-
- - No-Load: latency streams only.
- - Low-Load: at 10% PDR.
- - Mid-Load: at 50% PDR.
- - High-Load: at 90% PDR.
- - NDR-Load: at 100% NDR.
- - PDR-Load: at 100% PDR.
-
-- Latency is measured for all tested packet sizes except IMIX due to
- TG restriction.
-- 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 and HDRH latency values distribution per stream
- direction, hence two sets of latency values are reported per test
- case.
-- Reported latency values are aggregate across tested topology.
-- +/- 1 usec is the measurement accuracy advertised by TRex TG for the
- setup used.
-- TG setup introduces an always-on Tx/Rx interface latency of about 2
- * 2 usec per direction induced by TRex SW writing and reading packet
- timestamps on CPU cores.
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