Am 16.06.2011 20:57, schrieb al pat: > I have posted this on kvm alias, but have not heard back. seeing some inputs. > > 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.
Have a look at the guest kernel logs, lspci output or just at the device name: IDE disks are called /dev/sda etc. whereas virtio-blk disks are called /dev/vda etc. Kevin
