[libvirt] HELP: after host upgrade to F11, guest runs extremely slow

[Mark McLoughlin]

On Mon, 2009-05-25 at 19:52 -0400, Gerry Reno wrote:
> Gerry Reno wrote: 
> > Gerry Reno wrote: 
> > > Daniel P. Berrange wrote: 
> > > > On Sat, May 23, 2009 at 03:43:12PM -0400, Gerry Reno wrote:
> > > >   
> > > > > I upgraded the host from F10 to F11 (x86_64) with no issues.  Now when I 
> > > > > start a F10 (i386) guest it runs very very slow.  I also see messages on 
> > > > > the guest boot console about "clocksource tsc unstable" and some kernel 
> > > > > oops.  Once it got far enough to start network I logged in and checked 
> > > > > the clocksource and it currently is 'acpi_pm' even though the kernel 
> > > > > line says clocksource=pit.  The available clocksources are acpi_pm, 
> > > > > jiffies, and tsc.  I do not see 'pit' in the list.  How do I fix this issue?
> > > > >     
> > > > 
> > > > If the guest runs 'extrememly' slowly then the most like thing is that 
> > > > it has fallen back to using QEMU emulation, instead of KVM hardware
> > > > acceleration. Check the /var/log/libvirt/qemu/$GUEST.log to see if there
> > > > is any mesage about not being able to open /dev/kvm.  Also make sure that
> > > > KVM modules are loaded, and that 'virsh capabilities' lists KVM as a valid
> > > > domain.
> > > > 
> > > > Daniel
> > > >   
> > > Ok, I checked the guest log and it says:
> > > /dev/kvm: no such file or directory.
> > > 
> > > So how do I make this node?  Shouldn't libvirt have made it for
> > > us?
> > > 
> > Ok, once I got both kernel modules loaded, it created the /dev/kvm
> > device and now everything runs fine.
> > 
> Well, not quite so fine.  If I reboot the machine then the kvm modules
> are no longer loaded.  How do I keep these modules loaded?

Question is much more suited to fedora-virt at redhat.com list, but ...

/etc/sysconfig/modules/kvm.modules should run during boot and load the
modules

Cheers,
Mark.