linux-kernel - Re: [ck] Re: [ANNOUNCE] RSDL completely fair starvation free interactive cpu scheduler

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Date:	Mon, 5 Mar 2007 14:59:44 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	mjt@...v.org (Markus Törnqvist)
Cc:	Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [ck] Re: [ANNOUNCE] RSDL completely fair starvation free interactive cpu scheduler

Markus Törnqvist wrote:
> On Mon, Mar 05, 2007 at 08:34:45AM +0300, Al Boldi wrote:
> >Ok, gears is smooth when you run "make -j4", but with "nice make -j4",
> > gears becomes bursty.  This looks like a problem with nice-levels.  In
> > general, looking subjectively at top d.1, procs appear to show jerkiness
> > when nice'd.
>
> Don't use glxgears, please. Ever. Unless you want meaningless gears.
>
> It displays totally erratic behaviour anyway, and does sched_yield (strace
> tells us this) which means IT GIVES UP ITS TIME TO RUN, ie yields the
> cpu to someone else.

I just strace'd it here.  It doesn't show any yield in the mesa-5.0 version.  
Which version are you using?

> >Do you have an objective test-case that can show the even-ness of RSDL in
> >both nice'd and normal scenarios?
>
> A big movie, like DVD-quality, full resolution should do the trick.
> That's what I used ;)

The problem with audio/video is that they usually do buffering, which hides 
scheduler anomalies.

> Debian and Ubuntu at least ship "stress" which I also used and reniced
> in-flight with excellent results, but do note to start off with small
> settings and work up or you might overcommit your box, in a way which
> no scheduler can handle.

Can you give a link?


Thanks!

--
Al

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