A Warning for those running Cent/RHEL 6.x and e1000 NICs

Ryan Simpkins plug at ryansimpkins.com
Thu Dec 5 15:08:33 MST 2013

Long story short:
RHEL/CentOS 6.5 doesn't seem fully baked yet. Keep 'er in the oven a bit longer.

Short story long:
If you upgrade to CentOS 6.5 and the 2.6.32-431 kernel, your e1000 based Intel
NIC will stop working after a few moments upon reboot. You may see the
following kernel message:

eth0: Timesync Tx Control register not set as expected

The work around is to set pcie_aspm=off. I have confirmed this works. May this
save you a couple of hours of unplanned downtime. :)

Bug: http://bugs.centos.org/view.php?id=6810


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