>Fri 2/19/2010 Kenni Lund kenni at kelu.dk > >Do your own testing if in doubt. OK. Hosts: Centos 5.4 with kvm, and latest (yum) updates. The switch is a 3com gigabit switch. These are production servers and each has guests doing actual work, but the servers' cpus are idle most of the time. Guests: Centos 5.4 with latest updates. Only gnome desktop installed (no server components). 2 cpus assigned to each. 2 nics assigned to each. netperf-2.4.4-1.rhel5.x86_64.rpm running on each. 1 nic is e1000. 1 nic is virtio. E1000 test: Time: 10.03 secs Throughput: 429.76 Utilization: 23.64% Virtio test: Time: 10.03 secs Throughput: 539.15 Utilization: 5.29% So there is improvement...