linux-kernel - Re: [RFC patch 1/2] sched: dynamically adapt granularity with nr

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Date:	Mon, 13 Sep 2010 06:35:47 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [RFC patch 1/2] sched: dynamically adapt granularity with
 nr_running

On Sun, 2010-09-12 at 11:06 +0200, Peter Zijlstra wrote:
> On Sat, 2010-09-11 at 13:48 -0700, Linus Torvalds wrote:

> > And I don't like how you dismissed the measured latency improvement.
> > And yes, I do think latency matters. A _lot_.
> 
> OK, we'll make it better and sacrifice some throughput, can do, no
> problem.

I'm not seeing high wakeup latencies, even under hefty load.  Mathieu's
testcase is bad, but apparently solely due to START_DEBIT placement.
That's kind of a sticky wicket.  I've shot it in the heart before, but
regretted doing so when I looked at kbuild vs static load fairness.

	-Mike

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