Messages in this thread | | | Subject | Re: Preemptable Ticket Spinlock | From | Peter Zijlstra <> | Date | Mon, 22 Apr 2013 22:44:35 +0200 |
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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 :-)
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