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

[Brooks Davis]

On Thu, Jan 22, 2004 at 05:12:06PM -0800, Mike Hunter wrote:
> Hi everybody,
> 
> 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.

-- Brooks

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