FC9- BCM5754-MTU issue-Config-Error-SIOCSIFMTU:Invalid argument

[rpdumps]

Hello All,
I am trying to change MTU of my Netextreme BCM5754 to 9000.
I am receiving following error and nic card supports jumbo frames.


[user@localhost ~]$ sudo ethtool -i eth0
driver: tg3
version: 3.91
firmware-version: 5754-v3.15
bus-info: 0000:03:00.0

[user@localhost ~]$ sudo ifconfig eth0 mtu 9000
SIOCSIFMTU: Invalid argument

Ethernet controller: Broadcom Corporation NetXtreme BCM5754 Gigabit Ethernet PCI Express (rev 02)

Linux localhost 2.6.25.6-55.fc9.i686 #1 SMP Tue Jun 10 16:27:49 EDT 2008 i686 i686 i386 GNU/Linux

===============

Is there way to change MTU with other tools ?
Thanks for your suggestions

Padmanabhan

[Zotter]

I'm no MTU expert by any stretch - but seeing most are set to about 1500 (isn't that like a DSL standard or something?) I'd SWAG that 9000 is simply way the flock out of the allowable range.

Try scaling back by 500 each step and discover what your software, driver, firmware will allow.

You may want to read this:
http://www.dslreports.com/faq/tweaks/4._MTU
And seriously re-consider your goals here.

[rpdumps]

Thanks for response.
After lot of search, it seems BCM 5754 does not support jumbo frames.