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https://bugzilla.redhat.com/show_bug.cgi?id=556563 updated the sfc driver. It caused a regression: The "rss_cpus" module parameter has no effect anymore.

Upstream fix:
sfc: Restore the effect of the rss_cpus module parameter
http://git.kernel.org/?p=linux/kernel/git/bwh/sfc-2.6.git;a=commit;h=5b874e25c5c84bc45fc205407286fbe4744f4776

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

note for QA: "cat /proc/interrupts" to see that the parameter influences the number of queues used by the NIC.

Patch(es) available on kernel-2.6.32-112.el6

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html