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From: Vincent Guittot <vincent.guittot@linaro.org>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Rik van Riel <riel@redhat.com>
Subject: Re: [v2 patch v3.18+ regression fix] sched: Further improve spurious CPU_IDLE active migrations
Date: Tue, 6 Sep 2016 15:42:24 +0200	[thread overview]
Message-ID: <CAKfTPtD6gJVRyqE_GiKtE+T1osG-J_TnbHu7jYRy0qJjQCCQMw@mail.gmail.com> (raw)
In-Reply-To: <1473167264.32128.5.camel@gmail.com>

On 6 September 2016 at 15:07, Mike Galbraith <umgwanakikbuti@gmail.com> wrote:
> On Tue, 2016-09-06 at 15:01 +0200, Vincent Guittot wrote:
>> Le Monday 05 Sep 2016 à 18:26:53 (+0200), Mike Galbraith a écrit :
>> > Coming back to this, how about this instead, only increase the group
>> > imbalance threshold when sd_llc_size == 2.  Newer L3 equipped
>> > processors then aren't affected.
>> >
>>
>> Not sure that all systems with sd_llc_size == 2 wants this behavior.
>>
>> Why not adding a sched_feature for changing the 2nd half of the test
>> for some systems ?
>
> Because users won't know, and shouldn't need to know that they need to
> flip that switch.

fair enough

so how can we detect this specific system configuration ?

sd_llc_size == 2 is not enough IMHO

>
>         -Mike

  reply	other threads:[~2016-09-06 13:42 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-30  5:42 [patch v3.18+ regression fix] sched: Further improve spurious CPU_IDLE active migrations Mike Galbraith
2016-08-31 10:01 ` Peter Zijlstra
2016-08-31 10:18   ` Mike Galbraith
2016-08-31 10:36     ` Mike Galbraith
2016-08-31 15:52       ` Vincent Guittot
2016-09-01  4:11         ` Mike Galbraith
2016-09-01  6:37           ` Mike Galbraith
2016-09-01  8:09           ` Vincent Guittot
2016-09-05 16:26             ` [v2 patch " Mike Galbraith
2016-09-06 13:01               ` Vincent Guittot
2016-09-06 13:07                 ` Mike Galbraith
2016-09-06 13:42                   ` Vincent Guittot [this message]
2016-09-06 13:59                     ` Mike Galbraith
2016-09-06 13:44                   ` Mike Galbraith

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