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

Gerry Reno greno at verizon.net
Mon May 25 20:01:50 UTC 2009

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?


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