How to read sockperf output

[LuisRodriguezMSFT]

How to read sockperf output

[igor-ivanov]

I wanted to clarify how to read this data and know what those percentiles means.

the 99 percentile, is defined as the value that 99 out of 100 samples fall below. Thus 99 of 100, observe a latency less than this value, and 1 in every 100 observe a latency equal to or greater.
see function for percentiles output for more details https://github.com/Mellanox/sockperf/blob/sockperf_v2/src/client.cpp#L576

Is that there where frames that took 11533.498 usec to be replied?

yes

[LuisRodriguezMSFT]

Thanks Igor,

As avg-rtt is much lower (1892.600 usec / 1.892 msec) is that 99 percentile value something to worry about in terms of latency?
If my network requirement is to have 2ms or less as average am i safe taking in count the avg-rtt only?

I am saying this becase i tested this even on VM's within the same host (minimal latency) and whereas the avg-rtt is good i still get high values on the 99 percentile.

[igor-ivanov]

It will be nice to reduce abnormal values. It might be done tuning servers and configuration, binding application to correct cores etc.

[LuisRodriguezMSFT]

Thanks Igor