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

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Date:	Sun, 27 Jan 2008 17:57:05 +0100
From:	Toralf Förster <toralf.foerster@....de>
To:	vatsa@...ux.vnet.ibm.com
Cc:	Tomasz Chmielewski <mangoo@...g.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, a.p.zijlstra@...llo.nl,
	dhaval@...ux.vnet.ibm.com
Subject: Re: (ondemand) CPU governor  regression between 2.6.23 and 2.6.24

At Sunday 27 January 2008 Srivatsa Vaddagiri wrote :
> You can set that to 0 to ask ondemand gov to include nice load into
> account while calculating cpu freq changes:
> 
> # echo 0 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load
> 
> This should restore the behavior of ondemand governor as seen in 2.6.23
> in your case (even with CONFIG_FAIR_GROUP_SCHED enabled). Can you pls confirm 
> if that happens?

Yes, of course, unfortunately this speeds up the CPU up to max power consumption
which isn't wanted at least at a notebook b/c temperature and fan speed are at
maximum in that case :-(

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 ?


-- 
MfG/Sincerely

Toralf Förster
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