On (Fri) Jan 21 2011 [22:01:39], Daniel P. Berrange wrote:
>
> CPU UnPlugging is not considered as a needed feature is it?
>
http://www.linux-kvm.org/page/CPUHotPlug
> "Hot-unplug does not work, and actually, does not even make that much
sense."
I wouldn't neccessarily agree with the statement on
that page. I think it is perfectly valid to be able
to want to unplug CPUs. If you have a 4 CPU guest on
a 4 CPU host, and need to migrate the guest to a 2
CPU host, then it could well be a better idea to
unplug 2 of the guest CPUs than leave it overcommitted.
Thus I expect someone will make hot-unplug work eventually
One can always offline the CPUs from within the guest. In any case, CPU
hot-unplug requires cooperation from the guest so offlining isn't any
different.
Amit
--
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