On Wed, 19 Nov 2008 12:26:41 -0600, Anthony Liguori wrote: > Ryan Harper wrote: >> * Henrik Holst <[EMAIL PROTECTED]> [2008-11-18 08:42]: >> >>> The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2 >>> images by an order of 10. If one got 60MB/s before, one gets around >>> 6MB/s with 78 and 79 (measured with dd) >>> >>> >> dd command? >> >> what's your -drive parameters look like, specifically, what if type? >> ide, scsi, virtio? >> >> > This is probably the change to cache=writethrough. I bet if you set > cache=writeback then you'll see this go away.
this was it. cache=writeback and the throughput goes from 10mb/s to 80/mb/ s with if=scsi thanks. - Thomas -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
