Date: Thu, 22 Jan 2004 21:06:30 -0500 From: David Gilbert <dgilbert@dclg.ca> To: Mike Hunter <mhunter@ack.Berkeley.EDU> Cc: freebsd-net@freebsd.org Subject: [D800] Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo Problem Message-ID: <16400.33190.25580.251371@canoe.dclg.ca> In-Reply-To: <20040123011206.GA1701@ack.Berkeley.EDU> References: <20040123011206.GA1701@ack.Berkeley.EDU>
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>>>>> "Mike" == Mike Hunter <mhunter@ack.Berkeley.EDU> 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. 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. :(. Dave. -- ============================================================================ |David Gilbert, Independent Contractor. | Two things can only be | |Mail: dave@daveg.ca | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================
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