Open Stack

I am doing some testing on Openstack VM network performance. following
i am doing

Comute node: 8 CPU / 32GB mem
VM instance: 8vCPU / 8GB mem

when i am running heavy load application, immediate my ping started
breaking for VM.. but at same time if i ping Compute Host, its working
fine without any packet loss.

I have disabled GSO/TSO setting on eth0 but still same result.  i have
notice when it reach 250mbps my ping start breaking...