Can't turn on Jumbo Frames on bge0

Brad brad at
Fri Jun 9 23:57:39 UTC 2006

On Fri, Jun 09, 2006 at 07:49:07PM -0400, Mikhail Teterin wrote:
> Hello!
> I have a bge card, that's identified as:
> bge0: <Broadcom BCM5751 Gigabit Ethernet, ASIC rev. 0x4001> mem 0xfe8f0000-0xfe8fffff irq 16 at device 0.0 on pci2
> According to,
> the BCM5751 support jumbo frames up to 9Kb.
> However, when I try to increase the MTU on the card even by a little bit,
> I get:
> 	root at mi:/misha/mi (122) ifconfig bge0 mtu 1501
> 	ifconfig: ioctl (set mtu): Invalid argument
> Is the hardware lacking the capability, or am I doing something wrong?

There is a mistake on that web-page. None of Broadcom's PCI Express chipsets
support Jumbo frames.

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