This bug has been copied from bug #537876 and has been proposed to be backported to 5.4 z-stream (EUS).
in 2.6.18-164.13.1.el5
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-2010-0147.html
There is an issue with GRO and netxen drivers in stock RHEL5.4 Has this issue been addressed for netxen module or just ixgbe?
The fix described in this bug was generic and not driver specific.
Andy Thanks for lightning fast response, very much appreciated. -ilya