Date: Tue, 15 Oct 2002 23:05:27 -0700 From: Lars Eggert <larse@ISI.EDU> To: Petri Helenius <pete@he.iki.fi> Cc: Luigi Rizzo <rizzo@icir.org>, freebsd-net@FreeBSD.ORG Subject: Re: ENOBUFS Message-ID: <3DAD01A7.3020807@isi.edu> References: <065901c27495$56a94c40$8c2a40c1@PHE> <3DAC8FAD.30601@isi.edu> <068b01c2749f$32e7cf70$8c2a40c1@PHE> <20021015161055.A27443@carp.icir.org> <06c901c274d8$e5280b80$8c2a40c1@PHE>
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[-- Attachment #1 --]
Petri Helenius wrote:
>>how large are the packets and how fast is the box ?
>
>
> Packets go out at an average size of 1024 bytes. The box is dual
> P4 Xeon 2400/400 so I think it should qualify as "fast" ? I disabled
> hyperthreading to figure out if it was causing problems. I seem to
> be able to send packets at a rate in the 900Mbps when just sending
> them out with a process. If I do similar sending on two interfaces at
> same time, it tops out at 600Mbps.
The 900Mbps are similar to what I see here on similar hardware.
For your two-interface setup, are the 600Mbps aggregate send rate on
both interfaces, or do you see 600Mbps per interface? In the latter
case, is your CPU maxed out? Only one can be in the kernel under
-stable, so the second one won't help much. With small packets like
that, you may be interrupt-bound. (Until Luigi releases polling for em
interfaces... :-)
Lars
--
Lars Eggert <larse@isi.edu> USC Information Sciences Institute
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