linux-kernel - Re: [PATCH v10 10/11] sched: add SD_PREFER

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Message-ID: <20150326105534.GX21418@twins.programming.kicks-ass.net>
Date:	Thu, 26 Mar 2015 11:55:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com,
	kamalesh@...ux.vnet.ibm.com, riel@...hat.com, efault@....de,
	nicolas.pitre@...aro.org, dietmar.eggemann@....com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v10 10/11] sched: add SD_PREFER_SIBLING for SMT level

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@...aro.org>
> Reviewed-by: Preeti U. Murthy <preeti@...ux.vnet.ibm.com>

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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