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

[William Lee Irwin III]

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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