Re: [PATCH v10 10/11] sched: add SD_PREFER_SIBLING for SMT level

[Peter Zijlstra]

On Fri, Feb 27, 2015 at 04:54:13PM +0100, Vincent Guittot wrote:
> Add the SD_PREFER_SIBLING flag for SMT level in order to ensure that
> the scheduler will put at least 1 task per core.
> 
> Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
> Reviewed-by: Preeti U. Murthy <preeti@xxxxxxxxxxxxxxxxxx>

Preeti, what benchmarks did you use on power8 smt to verify performance?

I'm seeing a slight but statistically significant regression on my
ivb-ep kernel build when I match the build concurrency to my core count.

/me goes run (and install, its a fairly new box) more benches.
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