Date: Fri, 18 Oct 2002 10:45:13 -0700 (PDT) From: Kelly Yancey <kbyanc@posi.net> To: Luigi Rizzo <rizzo@icir.org> Cc: Petri Helenius <pete@he.iki.fi>, Lars Eggert <larse@ISI.EDU>, <freebsd-net@FreeBSD.ORG> Subject: Re: ENOBUFS Message-ID: <20021018103653.V1611-100000@gateway.posi.net> In-Reply-To: <20021018103319.A82982@carp.icir.org>
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On Fri, 18 Oct 2002, Luigi Rizzo wrote:
> On Fri, Oct 18, 2002 at 10:27:04AM -0700, Kelly Yancey wrote:
> ...
> > Hmm. Might that explain the abysmal performance of the em driver with
> > packets smaller than 333 bytes?
>
> what do you mean ? it works great for me. even on -current i
> can push out over 400kpps (64byte frames) on a 2.4GHz box.
>
> luigi
>
Using a SmartBit to push traffic across a 1.8Ghz P4; 82543 chipset card
plugged into PCI-X bus:
FrameSize TxFrames RxFrames LostFrames Lost (%)
330 249984 129518 120466 48.19
331 249144 127726 121418 48.73
332 248472 140817 107655 43.33
333 247800 247800 0 0
It has no trouble handling frames 333 bytes or larger. But for any frame
332 bytes or smaller we consistently see ~50% packet loss. This same machine
easily pushes ~100Mps with the very same frame sizes using a bge card rather
than em.
I've gotten the same results with both em driver version 1.3.14 and 1.3.15
on both FreeBSD 4.5 and 4.7 (all 4 combinations, that is).
Kelly
--
Kelly Yancey -- kbyanc@{posi.net,FreeBSD.org}
FreeBSD, The Power To Serve: http://www.freebsd.org/
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