linux-kernel - Re: Question about fair schedulers

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Message-ID: <20070623162837.47f31bf8@localhost>
Date:	Sat, 23 Jun 2007 16:28:37 +0200
From:	Paolo Ornati <ornati@...twebnet.it>
To:	Alberto Gonzalez <info@...bu.es>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Question about fair schedulers

On Sat, 23 Jun 2007 15:56:36 +0200
Alberto Gonzalez <info@...bu.es> wrote:

> > And yes, programs/distributions should set good defaults for you... and
> > if they don't, just complain to them  :)  
> 
> I'm sure they'll do once a fair scheduler goes into mainline :)

Some already does... for example the current version of:
	http://www.exit1.org/dvdrip/

it sets transcode nice to "+19" by default  :)

> 
> I guess what I was missing from the beginning is that "fair" means that the 
> scheduler will be fair among tasks that have the same priority, but if a task 
> has a higher priority, it _will_ get more CPU. So we'll just have to mark 
> applications like video players, audio players or games with a high priority, 
> others like encoders or compilers with low priority, and leave the rest 
> (browsers, word processors, email readers, etc...) as normal priority. This 
> way a fair scheduler would be able to give each task right amount of CPU.

Yes. I think that the more important thing is to nice background tasks
(like encoders etc..), then games / video players can run without
problems even without renicing (usually normal programs don't eat much
CPU).

-- 
	Paolo Ornati
	Linux 2.6.22-rc5-g0864a4e2 on x86_64
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