Forwarded Message/Missatge re-enviat:
> To: Patrick Geoffray <[email protected]>
> From: "A. Cameron Macdonell" <[email protected]>
> Subject: [myrinet] Re: tcp/ip in linux 2.4 kernel
> Date: Thu, 28 Jun 2001 13:42:13 -0600 (MDT)
> -----
>
> Hi Patrick,
>
> 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:
>
> > Andrew CJ Macdonell wrote:
> >
> > > test our setup and can't seem to get performance above 1 Gb/s, we
top out
> > > at about 960 Gb/s, does any one know of other results on the linux
2.4
> > > kernel? I have seen the results from Trapeze and realize they use
> > > FreeBSD and don't use GM, but still I imagine the protocol
performance
> > > difference should not be that great, our performance with UDP is
quite
> > > good, up to 1800 Gb/s.
> >
> > 960 Gb/s and 1800 Gb/s on a 2 Gb/s link ? :-)
> >
> > I haven't seen better than 1 Gb/s with TCP on PIII machines. The
memory
> > copies in the TCP/IP stack are the bottleneck. I have seen 1,7 Gb/s
> > with UDP, because the kernel overhead is much smaller.
> >
> > The kernel 2.4 is much better than 2.2 (no more than 1 Gb/s UDP with
> > 2.2)
> >
> > By curiosity, what is the sender and receiver CPU load when you top
out
> > at 960 Mb/s with TCP ?
> >
> > Patrick
> >
> > -----------------------------------------------------------
> > | Patrick Geoffray, Ph.D. [email protected] |
> > | Myricom, Inc. <a
href="http://www.myri.com">http://www.myri.com</a> |
> > | Cell: 865-389-8852 325 N. Santa Anita Ave. |
> > | Fax: 865-974-1950 Arcadia, CA 91006 |
> > -----------------------------------------------------------
> >
>
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