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

On 05/07/2012 06:49 AM, 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?

How does PLE help with ticket scheduling on unlock?  I thought it would
just help with the actual spin loops.


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