Re: [PATCH RFC 1/2] KVM: don't check for PF_VCPU when yielding

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On 28/11/2014 12:40, Raghavendra K T wrote:
> I am seeing very small improvement in <= 1x commit cases
> and for >1x overcommit, a very slight regression. But considering the
> test environment noises, I do not see much effect from the
> patch.

I think these results are the only one that could be statisically significant:

                   base     %stdev      patched     %stdev    %improvement
kernbench 1x    53.1421     2.3086      54.6671     2.9673      -2.86966
dbench    1x  6386.4737     1.0487    6703.9113     1.2298       4.97047

and, of course :) one of them says things get worse and the other
says things get better.

Paolo

> But I admit, I have not explored deeply about,
> 1. assumption of preempted approximately equals PF_VCPU case logic,
> 2. whether it helps for any future usages of yield_to against current
> sole usage of virtualization.
> 
> 
> 
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