[Devel] Re: [PATCH v3 4/6] add a new scheduler hook for context switch

[Peter Zijlstra]

On Wed, 2012-05-30 at 13:20 +0200, Peter Zijlstra wrote:
> 
> $ perf stat -e cycles --repeat 100 perf bench sched messaging -p -g 100
> 
>     48,826,146,710 cycles  #    2.470 GHz  ( +-  0.17% )
>        2.149005270 seconds time elapsed    ( +-  0.12% ) 

A repeat count of 250 dropped it down to:

        2.144582157 seconds time elapsed    ( +-  0.08% )

Also, if you're poking at the context switch path, something like:

$ taskset 1 perf stat -e cycles --repeat 10 perf bench sched pipe -l 100000

gives a good number and is usually more stable than hackbench.