From: Peter Zijlstra <peterz@infradead.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] sched: Disable affine wakeups by default
Date: Sun, 25 Oct 2009 09:01:25 +0100 [thread overview]
Message-ID: <1256457685.7356.3.camel@laptop> (raw)
In-Reply-To: <20091024130728.051c4d7c@infradead.org>
On Sat, 2009-10-24 at 13:07 -0700, Arjan van de Ven wrote:
> Subject: sched: Disable affine wakeups by default
> From: Arjan van de Ven <arjan@linux.intel.com>
>
> The global affine wakeup scheduler feature sounds nice, but there is a problem
> with this: This is ALSO a per scheduler domain feature already.
> By having the global scheduler feature enabled by default, the scheduler domains
> no longer have the option to opt out.
>
> There are domains (for example the HT/SMT domain) that have good reason to want
> to opt out of this feature.
>
> With this patch they can opt out, while all other domains currently default to
> the affine setting anyway.
>
> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
>
Hell no, that'll destroy many workloads. What you could possibly do is
disable it for sched domains that are known to share cache, maybe.
next prev parent reply other threads:[~2009-10-25 8:01 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-24 19:58 [PATCH 1/3] sched: Enable wake balancing for the SMT/HT domain Arjan van de Ven
2009-10-24 20:04 ` [PATCH 2/3] sched: Add aggressive load balancing for certain situations Arjan van de Ven
2009-10-24 20:07 ` [PATCH 3/3] sched: Disable affine wakeups by default Arjan van de Ven
2009-10-25 6:55 ` Mike Galbraith
2009-10-25 16:51 ` Arjan van de Ven
2009-10-25 17:38 ` Mike Galbraith
2009-10-25 19:33 ` Arjan van de Ven
2009-10-25 22:04 ` Mike Galbraith
2009-10-26 1:53 ` Peter Zijlstra
2009-10-26 4:38 ` Mike Galbraith
2009-10-26 4:52 ` Arjan van de Ven
2009-10-26 5:08 ` Mike Galbraith
2009-10-26 5:36 ` Arjan van de Ven
2009-10-26 5:47 ` Mike Galbraith
2009-10-26 5:57 ` Mike Galbraith
2009-10-26 7:01 ` Ingo Molnar
2009-10-26 7:05 ` Arjan van de Ven
2009-10-26 11:33 ` Suresh Siddha
2009-11-10 21:59 ` Peter Zijlstra
2009-11-11 6:01 ` Arjan van de Ven
2009-10-27 14:35 ` Mike Galbraith
2009-10-28 7:25 ` Mike Galbraith
2009-10-28 18:36 ` Mike Galbraith
2009-11-04 19:33 ` [tip:sched/core] sched: Check for an idle shared cache in select_task_rq_fair() tip-bot for Mike Galbraith
2009-11-04 20:37 ` Mike Galbraith
2009-11-04 21:41 ` Mike Galbraith
2009-11-05 9:30 ` Ingo Molnar
2009-11-05 9:57 ` Mike Galbraith
2009-11-05 10:00 ` Mike Galbraith
2009-11-06 7:09 ` [tip:sched/core] sched: Fix affinity logic " tip-bot for Mike Galbraith
2009-10-26 5:21 ` [PATCH 3/3] sched: Disable affine wakeups by default Mike Galbraith
2009-10-25 8:01 ` Peter Zijlstra [this message]
2009-10-25 8:01 ` [PATCH 2/3] sched: Add aggressive load balancing for certain situations Peter Zijlstra
2009-10-25 11:48 ` Peter Zijlstra
2009-10-25 8:03 ` [PATCH 1/3] sched: Enable wake balancing for the SMT/HT domain Peter Zijlstra
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