[CentOS-virt] KVM, virtualized interface, dropped packets.

Hi All.

I have currently a small problem to solve. I have a kvm virtual machine which in output of ifconfig eth0 | egrep 'RX packets|TX packets' RX packets:792681304 errors:0 dropped:560728 overruns:0 frame:0 TX packets:716661674 errors:0 dropped:0 overruns:0 carrier:0 show dropped packets. I think that rx buffer is to small (no strange messagess in dmesg) and would like to make it larger. But when I try a solution from http://www.scottalanmiller.com/linux/2011/06/20/working-with-nic-ring-buffer... I get: ethtool -g eth0 Ring parameters for eth0: Cannot get device ring settings: Operation not supported

So what is the proper way to make rx buffers larger in this situation?

Best regards, Rafal Radecki.