Hi, I'm experiencing bad disk I/O performance using virtio disks. I'm using Linux 2.6.29 (host & guest), kvm 84 userspace. On the host, and in a non-virtio guest, I get ~120 MB/s when writing with dd (the disks are fast RAID0 SAS disks). In a guest with a virtio disk, I get at most ~32 MB/s. The rest of the setup is the same. For reference, I'm running kvm -drive file=/tmp/debian-amd64.img,if=virtio. Is such performance expected? What should I check? Thank you, -- | Lucas Nussbaum | lucas@xxxxxxxxxxxxxxxxxx http://www.lucas-nussbaum.net/ | | jabber: lucas@xxxxxxxxxxx GPG: 1024D/023B3F4F | -- 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
