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

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.