Messages in this thread | | | Date | Mon, 22 Apr 2013 16:50:40 -0400 | From | Jiannan Ouyang <> | Subject | Re: Preemptable Ticket Spinlock |
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On Mon, Apr 22, 2013 at 4:44 PM, Peter Zijlstra <peterz@infradead.org> wrote: > On Mon, 2013-04-22 at 16:32 -0400, Rik van Riel wrote: >> >> IIRC one of the reasons was that the performance improvement wasn't >> as obvious. Rescheduling VCPUs takes a fair amount of time, quite >> probably more than the typical hold time of a spinlock. > > IIRC it would spin for a while before blocking.. > > /me goes re-read some of that thread... > > Ah, its because PLE is curing most of it.. !PLE it had huge gains but > apparently nobody cares about !PLE hardware anymore :-) >
For now, I don't know how good it can work with PLE. But I think it should save the time of VMEXIT on PLE machine.
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