Messages in this thread | | | Date | Mon, 22 Apr 2013 13:54:37 -0700 | From | Chegu Vinod <> | Subject | Re: Preemptable Ticket Spinlock |
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On 4/22/2013 1:50 PM, Jiannan Ouyang wrote: > 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. > . > Thanks for sharing your patch. 'am waiting for your v2 patch(es) and then let you any review feedback. Hoping to verify your changes on a large box (PLE enabled) and get back to you with some data...
Thanks Vinod
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