On 28/04/09 at 12:56 +0200, Lucas Nussbaum wrote: > I then upgraded to kvm-85 (both the host kernel modules and the > userspace), and re-ran the tests. Performance is better (about 85 MB/s), > but still very far from the non-virtio case. I forgot to mention that the strangest result I got was the total amount of write blocks queued (as measured by blktrace). I was writing a 1 GB file to disk, which resulted in: - 1 GB of write blocks queued without virtio - ~1.7 GB of write blocks queued with virtio on kvm 84 - ~1.4 GB of write blocks queued with virtio on kvm 85 I don't understand with kvm with virtio writes "more blocks than necessary", but that could explain the performance difference. -- | 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
