From owner-freebsd-net@FreeBSD.ORG Fri Jan 23 08:34:04 2004 Return-Path: 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 734D016A55E for ; Fri, 23 Jan 2004 08:34:04 -0800 (PST) Received: from moo.sysabend.org (moo.sysabend.org [66.111.41.70]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0003A43D45 for ; Fri, 23 Jan 2004 08:33:40 -0800 (PST) (envelope-from ragnar@sysabend.org) Received: by moo.sysabend.org (Postfix, from userid 1004) id 3C5C7F75; Fri, 23 Jan 2004 08:33:40 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by moo.sysabend.org (Postfix) with ESMTP id 3B219F24; Fri, 23 Jan 2004 08:33:40 -0800 (PST) Date: Fri, 23 Jan 2004 08:33:40 -0800 (PST) From: Jamie Bowden To: David Gilbert In-Reply-To: <16400.33190.25580.251371@canoe.dclg.ca> Message-ID: <20040123083134.B78161-100000@moo.sysabend.org> X-representing: Only myself. X-badge: We don't need no stinking badges. X-obligatory-profanity: Fuck X-moo: Moo. MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: dell-d800@eicat.ca cc: freebsd-net@freebsd.org cc: Mike Hunter Subject: Re: [D800] Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo Problem X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Jan 2004 16:34:04 -0000 On Thu, 22 Jan 2004, David Gilbert wrote: > >>>>> "Mike" == Mike Hunter writes: > > Mike> Hi everybody, I'm going to be trying to get gigabit throughput > Mike> between my laptop (Dell Latitude D800 running 5.2-release) and a > Mike> shuttle box running FreeBSD 5.1 (not in front of me at the > Mike> moment.) As part of the process, I attempted to increase the > Mike> frame size on my laptop, only to be greeted with disappointment: > > A few things to think about. I don't know what disk you got, but the > 60G disk in mine doesn't appear to be all that fast. You might be > able to get memory to memory transfers to be GigE speeds, but your > hard drive(s) are likely a limit from getting too much speed. The 40GB disk is 7200 RPM, but the others offered on that model are all 5400RPM. I was going to order mine with the 60G disk until my Dell rep. told me that little tidbit. > Mike> The C file talks about being able to do jumbo frames when the > Mike> mtu is big enough...anybody know what I'm missing? My card is a > Mike> "Broadcom BCM5705M" and I'm running FreeBSD 5.2-release. When I > Mike> asked google, it mostly pointed me at comments in if_bge.c > Mike> talking about jumbo frames :| > > Unfortunately, the chip in the D800 is a scaled down version. It > doesn't support jumbo frames. I assume that broadcom sells the > cripled part at a lower price than the full part. There are notes in > the driver about what's diabled in this specific version. I'm curious why the 800 would have the lower end chip, it's a higher end laptop all around when compared to the 600. Jamie Bowden -- "It was half way to Rivendell when the drugs began to take hold" Hunter S Tolkien "Fear and Loathing in Barad Dur" Iain Bowen