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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Fri, 9 Jun 2006 20:25:32 -0400
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Cc: Mikhail Teterin <mi+mx@aldan.algebra.com>, wpaul@windriver.com,
	Brad <brad@comstyle.com>
Subject: Re: Can't turn on Jumbo Frames on bge0
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On Friday 09 June 2006 07:57 pm, Brad wrote:
> 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
> > http://h18000.www1.hp.com/products/quickspecs/12131_div/12131_div
> >.HTML, 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@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.

I believe you are correct.

BTW, funny thing is I found several web pages by googling:

http://manuals.fujitsu-siemens.com/serverbooks/content/manuals/html/broadcom/features.htm
http://supportapj.dell.com/support/edocs/network/P29352/English/features.htm

Fujitsu-Simens says:
'Jumbo frames (up to 9 KB) (except for BCM5721 and BCM5751)'

Dell says:
'Jumbo frames (up to 9 kB) (only for BCM5721 and BCM5751)'

:-)

Jung-uk Kim