Strange network performance on Intel Rangeley (8 cores Atom)

[Jack Vogel]

What OS version are you running?

Jack



On Mon, Mar 3, 2014 at 12:54 PM, Olivier Cochard-Labbé
<olivier at cochard.me>wrote:

> Hi all,
>
> I've got a new toy in my network bench lab: a SuperMicro SuperServer
> 5018A-FTN4.
> But I've got a problem for understanding and obtaining good throughput for
> "routing" or "firewalling" usages.
>
> I'm using only the embedded 4 gigabit ports of the Atom C2758 SoC.
> With the default igb(4) parameters which is to create 8 queues (because
> there is 8 cores) this server is not able to receive more than 585K
> packet-per-seconds into one port which is far from the gigabit line-rate
> (1.48Mpps): I was expecting better throughput with 8 cores.
> Then I did a bunch of new benchmarks by measuring the impact of number of
> queue and the results are here:
>
> http://bsdrp.net/documentation/examples/forwarding_performance_lab_of_a_superserver_5018a-ftn4#graph
>
> => I've got better results with only 4 queues than 8... but still low
> throughput with only 938Kpps.
>
> Then I decided to measure the impact of pf and ipfw on the throughput with
> 4 and 8 queues.
> And the results are annoying:
>
> http://bsdrp.net/documentation/examples/forwarding_performance_lab_of_a_superserver_5018a-ftn4#graph1
>
> => With 8 queues, enabling pf or ipfw improve the input throughput of the
> igb(4) port.
>
> Why so low throughput with 8 queues ?
> Why better throughput with pf or ipfw enabled than without ?
>
> Thanks,
>
> Olivier
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