linux-kernel - Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for BALANCE

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Date:	Thu, 11 Jun 2015 23:42:14 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Josef Bacik <jbacik@...com>, Peter Zijlstra <peterz@...radead.org>
CC:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	umgwanakikbuti@...il.com, morten.rasmussen@....com,
	kernel-team <Kernel-team@...com>
Subject: Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for
 BALANCE_WAKE

On 06/11/2015 04:33 PM, Josef Bacik wrote:

> Ugh I'm sorry, I've been running tests trying to get the numbers to look
> good when I noticed I was getting some inconsistencies in my results.
> Turns out I never actually tested your patch just plain, I had been
> testing it with BALANCE_WAKE, because I was under the assumption that
> was what was best for our workload.  Since then I had fixed all of our
> scripts and such and noticed that it actually super duper sucks for us.
>  So testing with this original patch everything is significantly better
> (this is with the default SD flags set, no changes at all).
> 
> So now that I've wasted a good bit of my time and everybody elses, can
> we go about pushing this patch upstream?  If you are happy with it the
> way it is I'll go ahead and pull it into our kernels and just watch to
> make sure it ends upstream at some point.  Thanks,

FWIW, Jirka has run some tests with the patch as well,
and seen significant performance improvements on
various tests, on various systems.

Merging the patch makes perfect sense to me.

Acked-by: Rik van Riel <riel@...hat.com>

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