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 08:53:18 +0100
From:	Mike Galbraith <efault@....de>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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

On Tue, 2007-03-13 at 16:53 +1100, Con Kolivas wrote:
> On Tuesday 13 March 2007 16:10, Mike Galbraith 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.

(One more comment before I go.  You can then have the last word this
time, promise :)

Because the interactivity logic, which was put there to do precisely
this, is doing it's job?

>  To me 
> that means mainline is not living up to my expectations. What you're saying 
> is your expectations are based on a false cpu expectation from nice 5. You 
> can spin it both ways.

Talk about spin, you turn an example of the current scheduler working
properly into a negative attribute, and attempt to discredit me with it.

The floor is yours.  No reply will be forthcoming.

	-Mike

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