Re: Preemptable Ticket Spinlock

[Peter Zijlstra]

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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