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/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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