Messages in this thread | | | Date | Sun, 27 May 2007 13:20:47 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH 0/7] KVM: Suspend and cpu hotplug fixes |
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Avi Kivity wrote: > I estimate that that take_cpu_down will run for about a millisecond if > there are a few hundred vcpus which have last run on the dying cpu (and > that's an extreme case, which is not expected in normal operation).
I measured vmclear time on an uncached vmcs (which would be all except for a handful which are cached on the cpu core) at 144 cycles. Assuming a couple of cache misses for walking the list and accessing the vmcs, we're at about 500 cycles per vcpu, or 250us @ 2GHz. So worst case is significantly less than 1 ms.
Is this acceptable for take_cpu_down()?
-- error compiling committee.c: too many arguments to function
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