Can't turn on Jumbo Frames on bge0

[Mikhail Teterin <mi+mx_(_at_)_aldan_(_dot_)_algebra_(_dot_)_com>]

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_(_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?

Thanks!

	-mi
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