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| author |   Al Morton <acmorton@att.com> | 2016-03-26 16:49:20 -0400 |
|---|---|---|
| committer | Al Morton <acmorton@att.com> | 2016-03-26 17:01:27 -0400 |
| commit | aadc0ab58001b5c32bf641eec4906fd87f59ee49 (patch) | |
| tree | e0247d99f5dd4a797276c63b81fbf39c25ce0df0 | |
| parent | 0dad149cd7c5ba926f128abcec837a1c91255e08 (diff) | |
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 <acmorton@att.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
| -rw-r--r-- | docs/requirements/vswitchperf_ltd.rst | 10 |
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. |