Hi!

These are the two cards I am having issues with.

Broadcom Corporation NetXtreme BCM5721
Broadcom Corporation NetXtreme BCM5703X

Seems I'm having the same problems with the latter chip. Early last year
I tried to enable jumbo frames on our ProLiant ML370 and some
workstations and didn't succeed. As it was just a nice-to-have I didn't
investigate any further and just switched back to MTU 1500, but now this
sounds very familiar. It was kernel 2.6.12-hardened or something back
then, I'll check again one of these days.
I've expected the same issue with the former NIC (NetXtreme BCM5721) while trying to increase the MTU value higher than 1500.
The Broadcom support confirmed that this NIC doesn't support jumbo frames :(

regards 
Chris
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