Re: [PATCH v2 00/11] KVM in-guest performance monitoring

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On 06/16/2011 08:08 AM, David Ahern wrote:
> Command:
>   perf stat -e instructions  openssl speed aes

Hmm.. this might be the wrong benchmark for this. I thought
openssl-speed was a purely CPU intensive benchmark which should have
fairly similar performance numbers in both host and guest. I seem to
recall this as true 2 or so years ago, but that is not the case with
3.0-rc2 and F14.

Using a benchmark Vince W. wrote seems better:
  http://www.csl.cornell.edu/~vince/projects/perf_counter/million.s

perf stat -e instructions ./million

 Performance counter stats for './million':

         1,113,650 instructions              #    0.00  insns per cycle


David


> 
> Guest:
>    135,522,189,056 instructions              #    0.00  insns per cycle
> 
> 
> Host:
>    346,082,922,185 instructions              #    0.00  insns per cycle
> 
> 
> Adding '--no-scale' to the perf-stat had no effect on the relative
> difference.
> 
> David
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