Improve inter-vm transfer & performance on Xen Hypervisors

If you are experiencing slow throughput between one or more virtual machines on a Xen hypervisor, the following will resolve the issue:

ethtool -K eth0 tx off

To ensure the command is applied at boot, add it to your /etc/rc.local file.

You can run it and add it to your file in one command with:
ethtool -K eth0 tx off; echo "ethtool -K eth0 tx off" >> /etc/rc.local

Be sure to run the command/add the entry to any virtual machine within the same location.