[CentOS] Ethernet poor performance

nate wrote:

> One thing to try, shut down the network interfaces (/etc/init.d/network
> stop),

I noticed this which seems to be kinda-sorta-maybe related to what
you are experiencing:
https://bugs.launchpad.net/ubuntu/+source/gnome-network/+bug/35683

The suggestion is to boot with the option pci=noacpi

nate