Re: [D800] Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo Problem

From: Jamie Bowden (ragnar_at_sysabend.org)
Date: 01/23/04

  • Next message: David Gilbert: "Re: [D800] Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo Problem" 
    Date: Fri, 23 Jan 2004 08:33:40 -0800 (PST)
To: David Gilbert <dgilbert@dclg.ca>

    On Thu, 22 Jan 2004, David Gilbert wrote:

    > >>>>> "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.

    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 <alaric@alaric.org.uk>
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  • Next message: David Gilbert: "Re: [D800] Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo Problem"

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