On Thu, 2009-07-02 at 12:41 +0300, Avi Kivity wrote: > On 07/02/2009 08:48 AM, Avi Kivity wrote: > >> HOST time (make -j12&& make -j12 modules) with no guest running > >> ---------------------------------------------------------------- > >> real 6m50.936s > >> user 29m12.051s > >> sys 5m50.867s > >> > > > > 35 minutes cpu run on 7 minutes real time, so scaling 1:7. User time > > almost the same, system time different but not enough to account for > > the large difference in run time. > > > > I'm due to get my own Nehalem next week, I'll try to reproduce your > > results here. > > > > I reproduced this on a 2x4 barcelona, I get 6.6x scaling on the guest > compared to your 7.2x on the host. This is with a kvm.git host kernel. > Once thing that changed is an improvement in cfq with multiple threads; > try setting the host io scheduler for /dev/sdb to deadline (together > with dropping -usbdevice tablet). Haven't followed the thread in great detail, but has anyone tried putting the virtio disk back into rotational mode? See also: https://bugzilla.redhat.com/509383 and: http://lkml.org/lkml/2008/10/27/84 Cheers, Mark. -- 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
