We did some experiment trying to measure network performance overhead in virtualization environment, comparing between VFIO passthrough and virtio approaches. Test Topology 2 Intel Grantley-EP platforms (Xeon E5-2697 v3) connected by 10G link; memory 96 G. NIC: Intel 82599ES [1] Test Tool: iperf OS: RHEL 7.1 Result summary In native environment, iperf can get 9.4 Gbps throughput. Since iperf is a