On Mon, Mar 2, 2009 at 16:22, Anthony Liguori <anthony@xxxxxxxxxxxxx> wrote: > Malinka Rellikwodahs wrote: >>>> >>>> What version of kvm is this? Is it kvm-68? You'll have better luck >>>> with >>>> something newer than that. >>>> >> >> kvm-83 is the one with the problem, kvm-68 is working correctly. >> > > kvm-68 and qcow2 both use cache=writeback by default which is less safe than > cache=writethrough which is now the default. > > But performance shouldn't be as bad as your seeing. Running the kvm-84 install on the qcow image as kvm -m 1024 -drive file=qcow,boot=on,cache=writethrough, I get similar performance to the raw performance. So it looks like with cache set to writethrough there's a big performance hit on this setup, any ideas where to look for that? > Regards, > > Anthony Liguori -- 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
