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Date: Fri, 9 Jun 2006 19:57:34 -0400
From: Brad <brad@comstyle.com>
To: Mikhail Teterin <mi+mx@aldan.algebra.com>
Message-ID: <20060609235734.GG22853@blar.home.comstyle.com>
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Cc: wpaul@windriver.com, net@freebsd.org
Subject: Re: Can't turn on Jumbo Frames on bge0
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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.