CentOS 6.4 hung fix (kmod-e1000e and kmod-r8168 drivers)
check nic:
lspci -v
to rc.local
/sbin/ifconfig eth0 txqueuelen 10000
echo performance > /sys/module/pcie_aspm/parameters/policy
/sbin/grubby --args=pcie_aspm=off --update-kernel=ALL
update kmod-e1000e and kmod-r8168 from elrepo or from http://rpms.southbridge.ru for OpenVZ