[libvirt] HELP: after host upgrade to F11, guest runs extremely slow
Gerry Reno
greno at verizon.net
Mon May 25 21:42:24 UTC 2009
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.
Regards,
Gerry
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