linux-kernel - Re: Re: Re: Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU usage

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Date:	Tue, 29 Nov 2011 13:51:50 +0000 (GMT)
From:	"Artem S. Tashkinov" <t.artem@...os.com>
To:	mhocko@...e.cz
Cc:	pomac@...or.com, linux-kernel@...r.kernel.org, rjw@...k.pl,
	tino.keitel@...ei.de
Subject: Re: Re: Re: Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU
 usage

On Nov 29, 2011, Michal Hocko wrote: 

> It seems that this is cannot be set in runtime:
> SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL);
> 
> Or maybe you need to boot with cpuidle_sysfs_switch. According to the
> documentation you might be able to change the governor. I have no idea
> whether this can help somehow but let's try that.
> 
> I haven't found any intel_idle machine in my lab so far and all other
> acpi_idle machines seem to work (or at least randomly selected ones) so
> this smells like a major difference in the setup.

# echo acpi_idle > /sys/devices/system/cpu/cpuidle/current_driver
bash: /sys/devices/system/cpu/cpuidle/current_driver: Permission denied

BTW

# cat  /sys/devices/system/cpu/cpuidle/available_governors
ladder menu

dmesg | grep -i idle
[    0.000000] Kernel command line: root=/dev/sda1 ro cpuidle_sysfs_switch
[    0.000126] using mwait in idle threads.
[    1.083872] intel_idle: MWAIT substates: 0x1120
[    1.083873] intel_idle: v0.4 model 0x2A
[    1.083874] intel_idle: lapic_timer_reliable_states 0xffffffff
[    1.159043] cpuidle: using governor ladder
[    1.168842] cpuidle: using governor menu
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