[Bug 490072] Re: KVM VMs loses their CPU (kvm84 backport/hardy)

Soren Hansen soren at ubuntu.com
Tue Dec 1 13:59:07 UTC 2009


On Tue, Dec 01, 2009 at 01:00:54PM -0000, Yann Hamon wrote:
> Mmmh no don't think it could be the network, as munin is still working.
> I didn't check the VM console, but it's a good idea, I will try this
> next time. I kind of suspect ACPI, so will disable ACPI on failing VMs
> next time too.

Be aware that disabling ACPI can have very unfortunate side effects.

acpi is lower resolution timing source, but is not counter based, so it
will be better at preventing time slide in the guest. If the guest
kernel detects instability in the TSC, it will fall back to ACPI. If you
look at a few of your guests, I would be surprised if not at least 75%
had fallen back to ACPI.

Also, without ACPI you will not be able to cleanly shutdown the VM from
libvirt, but will have to ssh into the guest and issue a shutdown.

-- 
KVM VMs loses their CPU (kvm84 backport/hardy)
https://bugs.launchpad.net/bugs/490072
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