Broadcom NIC supports jumbo frames?

Craig Tierney ctierney at
Wed Dec 18 15:19:14 PST 2002

On Wed, Dec 18, 2002 at 01:00:11PM -0500, Jeff Layton wrote:
> Hello,
>    We've got a cluster with GigE NICS with Broadcom chips.
> ifconfig says,
> Broadcom    BCM5703
> and the driver that is loaded is 'bcm5700'. I assume this is the
> Tigon3 stuff?

>    I looked at the tg3 driver in the 2.4.20 kernel and I see that
> it supports jumbo frames. I want to make sure this is true. Is
> anybody using NICs with the same chipset? Are you running
> jumbo frames?
>    Just to be sure, if we are running jobs on this cluster, ALL of
> the nodes have to have a MTU of 9000 (I found that wasn't set
> correctly). Anything thing else I should check? (we're having
> MPI jobs fail after we switched all of the nodes to jumbo
> frames).

So are you currently using the bcm5700 driver or the tg3 driver?
The bcm5700 is a bad driver.  You should be using the tg3 driver.
I don't know if it supports Jumbo Frames, but it has got to be
better than the bcm driver even without it.


> TIA!
> Jeff
> --
> Jeff Layton
> Senior Engineer
> Lockheed-Martin Aeronautical Company - Marietta
> Aerodynamics & CFD
> "Is it possible to overclock a cattle prod?" - Irv Mullins
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Craig Tierney (ctierney at

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