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

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