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-rw-r--r--docs/testing/user/configguide/trafficgen.rst16
1 files changed, 16 insertions, 0 deletions
diff --git a/docs/testing/user/configguide/trafficgen.rst b/docs/testing/user/configguide/trafficgen.rst
index 52b1b4a5..c174af0a 100644
--- a/docs/testing/user/configguide/trafficgen.rst
+++ b/docs/testing/user/configguide/trafficgen.rst
@@ -39,6 +39,7 @@ and is configured as follows:
TRAFFIC = {
'traffic_type' : 'rfc2544_throughput',
'frame_rate' : 100,
+ 'burst_size' : 100,
'bidir' : 'True', # will be passed as string in title format to tgen
'multistream' : 0,
'stream_type' : 'L4',
@@ -857,6 +858,21 @@ place. This can be adjusted with the following configurations:
TRAFFICGEN_TREX_LEARNING_MODE=True
TRAFFICGEN_TREX_LEARNING_DURATION=5
+Latency measurements have impact on T-Rex performance. Thus vswitchperf uses a separate
+latency stream for each direction with limited speed. This workaround is used for RFC2544
+**Throughput** and **Continuous** traffic types. In case of **Burst** traffic type,
+the latency statistics are measured for all frames in the burst. Collection of latency
+statistics is driven by configuration option ``TRAFFICGEN_TREX_LATENCY_PPS`` as follows:
+
+ * value ``0`` - disables latency measurements
+ * non zero integer value - enables latency measurements; In case of Throughput
+ and Continuous traffic types, it specifies a speed of latency specific stream
+ in PPS. In case of burst traffic type, it enables latency measurements for all frames.
+
+.. code-block:: console
+
+ TRAFFICGEN_TREX_LATENCY_PPS = 1000
+
SR-IOV and Multistream layer 2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
T-Rex by default only accepts packets on the receive side if the destination mac matches the