Re: [Xen-devel] [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks

[Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>]

On 05/07/2012 07:19 PM, Avi Kivity wrote:
> On 05/07/2012 04:46 PM, Srivatsa Vaddagiri wrote:
> > * Raghavendra K T<raghavendra.kt@xxxxxxxxxxxxxxxxxx>  [2012-05-07 19:08:51]:
> >
> > > I 'll get hold of a PLE mc  and come up with the numbers soon. but I
> > > 'll expect the improvement around 1-3% as it was in last version.
> > Deferring preemption (when vcpu is holding lock) may give us better than 1-3%
> > results on PLE hardware. Something worth trying IMHO.
> Is the improvement so low, because PLE is interfering with the patch, or
> because PLE already does a good job?
It is because PLE already does a good job (of not burning cpu). The
1-3% improvement is because, patchset knows atleast who is next to hold
lock, which is lacking in PLE.


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