[ovs-discuss] Inaccurate statistics in flow_removed struct using OpenvSwitch
yapkke at stanford.edu
Wed May 18 22:22:51 UTC 2011
Thanks for the very fast response. TY tested the code and it worked.
On 18 May 2011 12:55, Ethan Jackson <ethan at nicira.com> wrote:
>> Looking at the code, ovs-openflowd returns facet + stat as packet
>> count for the flow removed. The number recorded by facet is correct,
>> but the sum of the value exceed the real value. This occurs at the
>> facet_update_stats function. What is the purpose of the addition?
>> Can we expect accurate statistics from OVS?
> I should have responded to this question in my previous email. Packet
> statistics are recorded in a best-effort fashion. In general they
> should be accurate, but there is no hard guarantee that they are
> especially in certain edge cases involving complex flow tables
> including resubmit actions. In short, you should expect accurate
> statistics from OVS noting the aforementioned caveat.
> Thanks again for reporting this bug.
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