From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Suresh Jayaraman <sjayaraman@suse.de>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH] sched: avoid huge bonus to sleepers on busy machines
Date: Mon, 04 Jan 2010 13:49:18 +0100 [thread overview]
Message-ID: <1262609358.9734.52.camel@marge.simson.net> (raw)
In-Reply-To: <1262608597.6408.117.camel@laptop>
On Mon, 2010-01-04 at 13:36 +0100, Peter Zijlstra wrote:
> On Mon, 2010-01-04 at 13:30 +0100, Mike Galbraith wrote:
> > Any diddling of sleeper fairness would have to be accompanied with a
> > preemption model change methinks.
>
> Just told jays the exact same thing on IRC ;-)
>
> Also, workloads are interesting, the signal test thing is the easiest to
> test the preemption side, various things like QPID show the down-side
> iirc.
Best testcase for the downside in my arsenal is vmark. It performs a
_lot_ better with no wakeup preemption. 'Course if you run your box
that way, you quickly find out what a horrible idea that is :)
-Mike
prev parent reply other threads:[~2010-01-04 12:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-04 9:20 [RFC][PATCH] sched: avoid huge bonus to sleepers on busy machines Suresh Jayaraman
2010-01-04 11:14 ` Mike Galbraith
2010-01-04 12:02 ` Suresh Jayaraman
2010-01-04 12:30 ` Mike Galbraith
2010-01-04 12:36 ` Peter Zijlstra
2010-01-04 12:49 ` Mike Galbraith [this message]
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