From: Mike Galbraith <efault@gmx.de>
To: Nicolas Kalkhof <nkalkhof@web.de>
Cc: maciej.rutecki@gmail.com,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [REGRESSION] sudden cpu hogging in kernel 3.2 rc-series
Date: Tue, 22 Nov 2011 06:03:03 +0100 [thread overview]
Message-ID: <1321938183.4942.8.camel@marge.simson.net> (raw)
In-Reply-To: <615350841.1406384.1321911635013.JavaMail.fmail@mwmweb021>
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
next prev parent reply other threads:[~2011-11-22 5:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 21:40 [REGRESSION] sudden cpu hogging in kernel 3.2 rc-series Nicolas Kalkhof
2011-11-22 5:03 ` Mike Galbraith [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-11-22 8:19 Nicolas Kalkhof
2011-11-22 10:22 ` Mike Galbraith
2011-11-18 20:33 Nicolas Kalkhof
2011-11-21 21:11 ` Maciej Rutecki
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