Re: Preemptable Ticket Spinlock

[Chegu Vinod]

On 4/22/2013 1:50 PM, Jiannan Ouyang wrote:
> On Mon, Apr 22, 2013 at 4:44 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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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