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

From: Mike Hunter (mhunter_at_ack.Berkeley.EDU)
Date: 01/23/04

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    Date: Thu, 22 Jan 2004 19:22:53 -0800
To: Brooks Davis <brooks@one-eyed-alien.net>

    On Jan 22, "Brooks Davis" wrote:

    > On Thu, Jan 22, 2004 at 05:12:06PM -0800, Mike Hunter wrote:
    > >
    > > I'm going to be trying to get gigabit throughput between my laptop (Dell
    > > Latitude D800 running 5.2-release) and a shuttle box running FreeBSD 5.1
    > > (not in front of me at the moment.) As part of the process, I attempted
    > > to increase the frame size on my laptop, only to be greeted with
    > > disappointment:
    > >
    > > celeste# ifconfig bge0
    > > bge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
    > > options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
    > > ether 00:0b:db:99:d6:06
    > > media: Ethernet 1000baseTX <full-duplex> (none)
    > > status: no carrier
    > > celeste# ifconfig bge0 mtu 9000
    > > ifconfig: ioctl (set mtu): Invalid argument
    > > celeste# ifconfig bge0 mtu 1501
    > > ifconfig: ioctl (set mtu): Invalid argument
    > > celeste# ifconfig bge0 mtu 1500
    > > celeste#
    > >
    > > The C file talks about being able to do jumbo frames when the mtu is big
    > > enough...anybody know what I'm missing? My card is a "Broadcom BCM5705M"
    > > and I'm running FreeBSD 5.2-release. When I asked google, it mostly
    > > pointed me at comments in if_bge.c talking about jumbo frames :|
    >
    > From looking at the code, BCM5705's don't support Jumbo Frames.

    Thanks for the help everybody.

    "I will not 'read' C files with `grep`. I will not 'read' C files with
    `grep`. I will not 'read' C files with `grep`...."

    Mike
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