linux-kernel - Re: [BUG][2.6.30] Niced processes do not raise CPU frequency with ondemand

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Date:	Fri, 12 Jun 2009 19:25:37 +0200
From:	Frans Pop <elendil@...net.nl>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [BUG][2.6.30] Niced processes do not raise CPU frequency with ondemand

Thanks for the quick reply Venki.

On Friday 12 June 2009, Pallipadi, Venkatesh wrote:
> What does ignore_nice under cpufreq/ondemand say?

Right, that's 1 (was not aware that existed :-P)
And changing it to 0 solves the problem.

Next question is: how and why does it get set?
As userland has not changed (AFAIK), my first suspect remains the kernel.

# grep . /sys/devices/system/cpu/cpu*/cpufreq/ondemand/*
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load:1
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/powersave_bias:0
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate:80000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max:40000000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_min:40000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold:90
/sys/devices/system/cpu/cpu1/cpufreq/ondemand/ignore_nice_load:1
/sys/devices/system/cpu/cpu1/cpufreq/ondemand/powersave_bias:0
/sys/devices/system/cpu/cpu1/cpufreq/ondemand/sampling_rate:80000
/sys/devices/system/cpu/cpu1/cpufreq/ondemand/sampling_rate_max:40000000
/sys/devices/system/cpu/cpu1/cpufreq/ondemand/sampling_rate_min:40000
/sys/devices/system/cpu/cpu1/cpufreq/ondemand/up_threshold:90
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