linux-kernel - does niced processes scales frequency too at the ondemand governor ?

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Message-ID: <527A8A7E.1050906@gmx.de>
Date:	Wed, 06 Nov 2013 19:29:18 +0100
From:	Toralf Förster <toralf.foerster@....de>
To:	cpufreq@...r.kernel.org
CC:	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: does niced processes scales frequency too at the ondemand governor
 ?

Running a Gentoo Linux at a 4-core CPU (i5) I realize, that compiling
packages using -j4 usually needs twice as long, if I run 4 BOINC
processes in the back ground (nice -n 19) too. Even considering effects
of invalidation of cache data this seems a too big impact in my eyes.

It looks for me like that the BOINC processes scales down the frequency,
when they are running. This behaviour however would be wrong IMO. The
frequency should be scaled just by the non-niced foreground processes,
right ?

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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