linux-kernel - Re: [REGRESSION] sudden cpu hogging in kernel 3.2 rc-series

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Message-ID: <1525712996.2585575.1321949994931.JavaMail.fmail@mwmweb003>
Date:	Tue, 22 Nov 2011 09:19:54 +0100 (CET)
From:	"Nicolas Kalkhof" <nkalkhof@....de>
To:	"Mike Galbraith" <efault@....de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	maciej.rutecki@...il.com
Subject: Re: [REGRESSION] sudden cpu hogging in kernel 3.2 rc-series

Hi Mike,

thanks for your reply! I didn't set any polling explicitly.

My boot params are:
intel_iommu=off pcie_aspm=force i915.powersave=1 i915.i915_enable_rc6=1

and in the cpufrequtils startup daemon the only parameter set is:
# Options when starting cpufreq (given to the `cpufreq-set` program)
START_OPTS="--governor ondemand"

egrep "IDLE|GOV" .config yields:

CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
CONFIG_ARCH_HAS_DEFAULT_IDLE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
CONFIG_CPU_IDLE=y
CONFIG_CPU_IDLE_GOV_LADDER=y
CONFIG_INTEL_IDLE=y
# CONFIG_I7300_IDLE is not set

Any advice?

Thanks and Regards
Nic



-----Ursprüngliche Nachricht-----
Von: "Mike Galbraith" <efault@....de>
Gesendet: Nov 22, 2011 6:03:03 AM
An: "Nicolas Kalkhof" <nkalkhof@....de>
Betreff: Re: [REGRESSION] sudden cpu hogging in kernel 3.2 rc-series

>On Mon, 2011-11-21 at 22:40 +0100, Nicolas Kalkhof wrote:
>> This happens on my machine after some minutes, too when running X and
>> the trinity desktop. the cpu continuously uses up additional ~10 watts
>> comparing to older 3.1 kernels. The issue remains high even after I
>> kill X. A closer investigation shows that poll_idle uses up the cpu
>> (see dump below). Is it normal for poll_idle to use up all ressources?
>
>poll_idle should not consume cycles on i7 unless you booted idle=poll,
>or miss-configured the kernel.
>
>egrep 'IDLE|GOV' .config
>
>CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
>CONFIG_ARCH_HAS_DEFAULT_IDLE=y
>CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
># CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
># CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
># CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
>CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
>CONFIG_CPU_FREQ_GOV_POWERSAVE=m
>CONFIG_CPU_FREQ_GOV_USERSPACE=m
>CONFIG_CPU_FREQ_GOV_ONDEMAND=m
>CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m
>CONFIG_CPU_IDLE=y
>CONFIG_CPU_IDLE_GOV_LADDER=y
>CONFIG_CPU_IDLE_GOV_MENU=y
>CONFIG_INTEL_IDLE=y
>CONFIG_I7300_IDLE_IOAT_CHANNEL=y
>CONFIG_I7300_IDLE=m
>CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND=y
>CONFIG_DEVFREQ_GOV_PERFORMANCE=y
>CONFIG_DEVFREQ_GOV_POWERSAVE=y
>CONFIG_DEVFREQ_GOV_USERSPACE=y
>
>


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