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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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