> OK, ntttcp is better that iperf for test, but do you change the properties of > the NIC to 10 Gb/s into of the Windows VM? (I don't remember if it is the > default configuration) see: http://pve.proxmox.com/wiki/Paravirtualized_Network_Drivers_for_Windows http://www.linux-kvm.org/page/WindowsGuestDrivers/kvmnet/registry