BCM5721 and jumbo frames (PowerEdge R200)

[Wolfram Schlich]

Hi,

according to the Dell site
http://support.dell.com/support/edocs/network/P29352/English/features.htm#features
the BCM5721 network adapters do support jumbo frames.

Interestingly, Fujitsu-Siemens says, the don't:
http://manuals.fujitsu-siemens.com/serverbooks/content/manuals/html/broadcom/netxtreme_57xx/bacs.htm

I fail to set the interfaces MTU to any value larger than 1500
(kernel 2.6.23) -- the error is "SIOCSIFMTU: Invalid argument".

So please Dell folks, can you *definitely* tell whether the BCM5721
adapters do support jumbo frames or not?

TIA.
-- 
Regards,
Wolfram Schlich <wschlich at gentoo.org>
Gentoo Linux * http://dev.gentoo.org/~wschlich/