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

Michal Hocko
2011-11-29T13:10:45Z

On Tue 29-11-11 12:54:16, Artem S. Tashkinov wrote:
> > On Nov 29, 2011, Michal Hocko wrote:
> >
> > On Tue 29-11-11 13:31:56, Michal Hocko wrote:
> > > On Tue 29-11-11 11:38:47, Artem S. Tashkinov wrote:
> > [...]
> > > > $ grep . -r /sys/devices/system/cpu/cpuidle/
> > > > /sys/devices/system/cpu/cpuidle/current_driver:intel_idle
> > > > /sys/devices/system/cpu/cpuidle/current_governor_ro:menu
> >
> > Could you try with acpi_idle driver?
> > echo acpi_idle > /sys/devices/system/cpu/cpuidle/current_driver
>
> [root@localhost ~]# echo acpi_idle > /sys/devices/system/cpu/cpuidle/current_driver
> -bash: /sys/devices/system/cpu/cpuidle/current_driver: Permission denied

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.