linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Message-ID: <20070417230754.GR2986@holomorphy.com>
Date:	Tue, 17 Apr 2007 16:07:54 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	"Michael K. Edwards" <medwards.linux@...il.com>
Cc:	Peter Williams <pwil3058@...pond.net.au>,
	Ingo Molnar <mingo@...e.hu>, Nick Piggin <npiggin@...e.de>,
	Mike Galbraith <efault@....de>,
	Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>,
	Bill Huey <billh@...ppy.monkey.org>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

On Tue, Apr 17, 2007 at 04:00:53PM -0700, Michael K. Edwards wrote:
> Works, that is, right up until you add nonlinear interactions with CPU
> speed scaling.  From my perspective as an embedded platform
> integrator, clock/voltage scaling is the elephant in the scheduler's
> living room.  Patch in DPM (now OpPoint?) to scale the clock based on
> what task is being scheduled, and suddenly the dynamic priority
> calculations go wild.  Nip this in the bud by putting an RT priority
> on the relevant threads (which you have to do anyway if you need
> remotely audio-grade latency), and the lock affinity heuristics break,
> so you have to hand-tune all the thread priorities.  Blecch.
[...not terribly enlightening stuff trimmed...]

The ongoing scheduler work is on a much more basic level than these
affairs I'm guessing you googled. When the basics work as intended it
will be possible to move on to more advanced issues.


-- wli
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