Forwarded Message/Missatge re-enviat:
> To: "A. Cameron Macdonell" <[email protected]>
> From: Bob Felderman <[email protected]>
> Subject: [myrinet] Re: Re: tcp/ip in linux 2.4 kernel
> Date: Thu, 28 Jun 2001 13:39:39 -0700 (PDT)
> -----
> On Thu, 28 Jun 2001, A. Cameron Macdonell wrote:
> >
> > Here are the CPU usage for messages of size 512 with sending and
> > receiver buffers of 32767 by way of the output of top,
> >
> > I included the CPU monitor stuff as well,
> >
> > Actually on this test we hit throughput of 1045 Gb/s
> >
> > Here is the output of top
> >
> > netperf side:
> > CPU0 states: 3.2% user, 59.0% system, 0.0% nice, 37.1% idle
> > CPU1 states: 1.4% user, 38.4% system, 0.0% nice, 59.0% idle
> >
> > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME
COMMAND
> > 13871 cam 15 0 720 720 548 R 99.9 0.1 8:11
netperf
> >
> >
> > netserver side:
> > CPU0 states: 0.0% user, 26.3% system, 0.0% nice, 73.1% idle
> > CPU1 states: 0.3% user, 67.2% system, 0.0% nice, 31.4% idle
> >
> > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME
COMMAND
> > 14321 cam 15 0 868 868 436 R 71.1 0.1 0:54
netserver
> >
> > On Thu, 28 Jun 2001, Patrick Geoffray wrote:
>
>
> I've never really seen linux get consistently above 1gigabit/sec with
> the current GM/ethernet implementation. In fact, when I moved from
> using 666MHz processors to 800MHz processors using the exact same
> setup, just replacing the CPUs, I saw my tcp performance go down!
> There's definitely something fishy with the linux windowing,
buffering,
> etc. code, or perhaps our driver interacts badly somehow.
>
> 1.8Gbit/sec sounds about right for UDP and is a further indication
that
> linux doesn't have the right sort of flow-control and buffering
> strategies for the tcp-side of the IP stack.
>
> ------------------------------------------------------------------
> Bob Felderman (626) 821-5555
> Director of Software Development (626) 821-5316 fax
> Myricom Inc. [email protected]
> 325 N. Santa Anita Ave. <a
href="http://www.myri.com">http://www.myri.com</a>
> Arcadia, CA 91006
> ------------------------------------------------------------------
>
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