From owner-freebsd-net Fri Oct 18 10:45:20 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4E3E137B401 for ; Fri, 18 Oct 2002 10:45:19 -0700 (PDT) Received: from pimout2-ext.prodigy.net (pimout2-ext.prodigy.net [207.115.63.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 503C243EB2 for ; Fri, 18 Oct 2002 10:45:18 -0700 (PDT) (envelope-from kbyanc@posi.net) Received: from gateway.posi.net (adsl-63-201-92-224.dsl.snfc21.pacbell.net [63.201.92.224]) by pimout2-ext.prodigy.net (8.12.3 da nor stuldap/8.12.3) with ESMTP id g9IHjEcK036722; Fri, 18 Oct 2002 13:45:15 -0400 Received: from localhost (localhost [127.0.0.1]) by gateway.posi.net (8.12.6/8.12.5) with ESMTP id g9IHjDOQ001677; Fri, 18 Oct 2002 10:45:13 -0700 (PDT) (envelope-from kbyanc@posi.net) Date: Fri, 18 Oct 2002 10:45:13 -0700 (PDT) From: Kelly Yancey To: Luigi Rizzo Cc: Petri Helenius , Lars Eggert , Subject: Re: ENOBUFS In-Reply-To: <20021018103319.A82982@carp.icir.org> Message-ID: <20021018103653.V1611-100000@gateway.posi.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org 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