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

[Mike Hunter]

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