(2015-05-14)
Problem
I've transplanted a Hyper-V VM running CentOS 6.3 from one Hyper-V host to another, possibly changing the versions of Hyper-V it is running on. The VM will pick up a DHCP lease but after that stops talking to the network. Setting a static IP doesn't help.
Eventually dmesg fills up with noise like:
eth2: 21140 transmit timed out, status fc6981c7, SIA fffffe00 00000068 00000070 fffffec8, resetting...
(or whatever your eth device is).
Solution:
# chkconfig irqbalance off
# reboot
(
Source)
Commentary
WTFBBQ?!