[openstack-dev] [Performance][Shaker]

Sai Sindhur Malleni smalleni at redhat.com
Mon Jan 23 22:31:39 UTC 2017


Thanks Ilya!

On Mon, Jan 23, 2017 at 6:56 AM, Ilya Shakhat <ishakhat at mirantis.com> wrote:

> Hi Sai,
>
> In UDP testing PPS represents packets sent by iperf client to server. Loss
> is the percentage of packets that were not received by server (more
> specifically the server tracks packets and sums gaps between of them,
> https://github.com/esnet/iperf/blob/3.0.7/src/iperf_udp.c#L64).
>
> While reported PPS depends on bandwidth and concurrency it makes sense to
> increase them until loss starts going up, meaning that the communication
> channel is near the limit.
>
> Thanks,
> Ilya
>
> 2017-01-21 1:19 GMT+04:00 Sai Sindhur Malleni <smalleni at redhat.com>:
>
>> Hey,
>>
>> When using the "iperf3" class in shaker for looking at UDP small packet
>> performance, we see that as we scale up the concurrency the average PPS
>> goes up and also the loss % increases. Is the loss % a percentage of the
>> PPS or does the PPS only represent successful transmissions? Thanks!
>>
>> --
>> Sai Sindhur Malleni
>> Software Engineer
>> Red Hat Inc.
>> 100 East Davie Street
>> Raleigh, NC, USA
>> Work: (919) 754-4557 | Cell: (919) 985-1055
>>
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-- 
Sai Sindhur Malleni
Software Engineer
Red Hat Inc.
100 East Davie Street
Raleigh, NC, USA
Work: (919) 754-4557 | Cell: (919) 985-1055
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