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

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Message-Id: <200703122022.43021.kernel@kolivas.org>
Date:	Mon, 12 Mar 2007 20:22:42 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2

On Monday 12 March 2007 19:55, Mike Galbraith wrote:
> On Mon, 2007-03-12 at 19:29 +1100, Con Kolivas wrote:
> > I'll save you the trouble. I just checked myself and indeed the load is
> > only 1. What this means is that although there are 2 tasks running, only
> > one is running at any time making a total load of 1. So, if we add two
> > other tasks that add 2 more to the load the total load is 3. However if
> > we weight the other two tasks at nice 5, they only add .75 each to the
> > load making a weighted total of 2.5. This means that X+Gforce together
> > should get a total of 1/2.5 or 40% of the overall cpu. That sounds like
> > exactly what you're describing is happening.
>
> Hmm.  So... anything that's client/server is going to suffer horribly
> unless niced tasks are niced all the way down to 19?

Fortunately most client server models dont usually have mutually exclusive cpu 
use like this X case. There are many things about X that are still a little 
(/me tries to think of a relatively neutral term)... wanting. :(

-- 
-ck
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