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

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Message-ID: <20070313082251.GA26604@elte.hu>
Date:	Tue, 13 Mar 2007 09:22:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Mike Galbraith <efault@....de>,
	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


* Con Kolivas <kernel@...ivas.org> wrote:

> > It's not "offensive" to me, it is a behavioral regression.  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.  Doesn't the fact that you're asking 
> > me to lower my expectations tell you that I just might have a point?
> 
> Yet looking at the mainline scheduler code, nice 5 tasks are also 
> supposed to get 75% cpu compared to nice 0 tasks, however I cannot 
> seem to get 75% cpu with a fully cpu bound task in the presence of an 
> interactive task. [...]

i'm sorry, but your argument seems to be negated. We of course have no 
problem with interactive tasks stealing CPU time from CPU hogs. The 
situation Mike found is _the other direction_: that /CPU hogs/ stole 
from interactive tasks. That's bad and needs to be fixed. Please?

	Ingo
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