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

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?