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-rw-r--r--docs/requirements/vswitchperf_ltd.rst10
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/requirements/vswitchperf_ltd.rst b/docs/requirements/vswitchperf_ltd.rst
index 87559766..72a93cb4 100644
--- a/docs/requirements/vswitchperf_ltd.rst
+++ b/docs/requirements/vswitchperf_ltd.rst
@@ -959,7 +959,15 @@ largest frames of 9K bytes.
Types of tests are:
1. Throughput test defines the maximum number of frames per second
- that can be transmitted without any error.
+ that can be transmitted without any error, or 0% loss ratio.
+ In some Throughput tests (and those tests with long duration),
+ evaluation of an additional frame loss ratio is suggested. The
+ current ratio (10^-7 %) is based on understanding the typical
+ user-to-user packet loss ratio needed for good application
+ performance and recognizing that a single transfer through a
+ vswitch must contribute a tiny fraction of user-to-user loss.
+ Further, the ratio 10^-7 % also recognizes practical limitations
+ when measuring loss ratio.
2. Latency test measures the time required for a frame to travel from
the originating device through the network to the destination device.