From aadc0ab58001b5c32bf641eec4906fd87f59ee49 Mon Sep 17 00:00:00 2001 From: Al Morton Date: Sat, 26 Mar 2016 16:49:20 -0400 Subject: LTD: Add Rationale for 10^-7 % Loss Ratio This expanded item in the Throughput RFC description explains a choice we made in Release A. modified: docs/requirements/vswitchperf_ltd.rst JIRA: VSPERF-2?? (having trouble with JIRA on 3/26) Change-Id: Icf5132f55c8b00f99c41439ca644655dfcdf017d Signed-off-by: Al Morton Reviewed-by: Maryam Tahhan Reviewed-by: Martin Klozik Reviewed-by: Christian Trautman --- docs/requirements/vswitchperf_ltd.rst | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'docs/requirements/vswitchperf_ltd.rst') 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. -- cgit 1.2.3-korg