[ntp:questions] Testing throughput in NTP servers

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Sat Sep 15 08:57:54 UTC 2012

Rick Jones wrote:
> Terje Mathisen <"terje.mathisen at tmsw.no"> wrote:
>> You're talking 10 GiGE wire speed, right?
>> That's more than 100 M requests/second!
> If I recall correctly, the maximum number of minimim sized frames per
> second for 10GbE is something like 14.7M or 14.8M each way.  I think

Ooops, I managed to skip the bits-to-bytes step.:-(

Anyway, the CPU cycles needed for wire speed is obviously easy to get 
then, the bottlenecks should be in the NIC/bus/hw parts.

> Luigi Rizzo has gotten 10+ Mpps with an Intel NIC (just basic
> networking) using his netmap stuff.
> Using a two-socket server with E5-2680s, and a non-Intel 10GbE NIC
> I've seen around 2.89 M pps each way on a single port with aggregate,
> concurrent, burst-mode netperf TCP_RR tests. If I use non-burst mode
> and many more concurrent netperf's it is more like 2.5 (from memory).
> I suspect it becomes more of a context-switching benchmark at that
> point.  Haven't quite gotten around to driving both ports at once.



- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

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