For any fellow sysadmins googling for this issue: I've found a fix. The
problem was in the IMPI support of these network cards. Download the
Broadcom diagnostic tool (see
http://www.broadcom.nl/support/ethernet_nic/netxtreme_server.php), try
to find something off which you can boot into DOS (that turned out to be
a challenge), and run b57udiag -c 0 -ipmi 0 and b57udiag -c 1 -ipmi 0 to
turn off IMPI on both cards, and it's fixed! Note that turning off IPMI
in the BMC is not enough, it has to be turned off in the network card
itself.
So, this bug can be closed I think, as it's not a problem in the
kernel/driver.
Kind regards,
Michel.
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