linux-kernel - Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2

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Date:	Tue, 13 Mar 2007 09:18:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Con Kolivas <kernel@...ivas.org>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2

* Mike Galbraith <efault@....de> wrote:

> [...] The situation as we speak is that you can run cpu intensive 
> tasks while watching eye-candy.  With RSDL, you can't, you feel the 
> non-interactive load instantly. [...]

i have to agree with Mike that this is a material regression that cannot 
be talked around.

Con, we want RSDL to /improve/ interactivity. Having new scheduler 
interactivity logic that behaves /worse/ in the presence of CPU hogs, 
which CPU hogs are even reniced to +5, than the current interactivity 
code, is i think a non-starter. Could you try to fix this, please? Good 
interactivity in the presence of CPU hogs (be them default nice level or 
nice +5) is _the_ most important scheduler interactivity metric. 
Anything else is really secondary.

	Ingo

ps. please be nice to each other - both of you are long-time
    scheduler contributors who did lots of cool stuff :-)
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