linux-kernel - Re: (ondemand) CPU governor regression between 2.6.23 and 2.6.24

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Message-ID: <20080127223218.GA19948@elte.hu>
Date:	Sun, 27 Jan 2008 23:32:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Toralf Förster <toralf.foerster@....de>,
	vatsa@...ux.vnet.ibm.com, Tomasz Chmielewski <mangoo@...g.org>,
	linux-kernel@...r.kernel.org, dhaval@...ux.vnet.ibm.com
Subject: Re: (ondemand) CPU governor  regression between 2.6.23 and 2.6.24


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Sun, 2008-01-27 at 17:57 +0100, Toralf Förster wrote:
> 
> > It would be nice to run a grid application at lowest priority 
> > without impact to power / fan / temperature but OTOH have full 
> > performance for desktop applications, isn't it ?
> 
> This can be achieved by giving the group/uid the grid application uses 
> a weight of 2.

yes, that's the correct solution. For example, the following line in 
/etc/rc.d/rc.local:

echo 2 > /sys/kernel/uids/`grep -w nobody /etc/passwd | cut -d: -f3`/cpu_share

sets user 'nobody' to a very low cpu weight. If there's any grid user, 
it can be done similarly. The default is 1024.

	Ingo
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