Hello All, Additional information, still seeking some pointers/guidance as to how to determine virtio is being used... I configured a VM to use block device with if=virtio (create a 1GB disk using DD) I exported this disk to the VM and am now doing scp from host to the guest after creating partition/mkfs. I created another 1GB disk and export it as a IDE disk. I use the same scp command from host to guest after creating partition/mkfs. I am trying to determine if my block IO is indeed using virtio in the first case. Empirically, I observe that with if=virtio, the throughput is about 30% more (in terms of mbps) and time taken is about 40% less than for the case where I passed the disk as a IDE disk. My scp happens over virbr0 interface (and currently I am not concerned if networking is using virtio) How do I confirm that virtio is being used? Are there any debugs that I can enable to do that. I am using ubuntu server (2.6.38-8) as host and ubuntu (2.6.24-29) client as guest. thx much -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html