linux-kernel - Re: [intel-pstate driver regression] processor frequency very high even if in idle

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Date:	Sat, 2 Apr 2016 20:20:32 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jörg Otte <jrg.otte@...il.com>
Cc:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Doug Smythies <dsmythies@...us.net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

On Sat, Apr 2, 2016 at 7:19 PM, Jörg Otte <jrg.otte@...il.com> wrote:
> 2016-04-02 17:28 GMT+02:00 Srinivas Pandruvada
> <srinivas.pandruvada@...ux.intel.com>:
>>
>> On Sat, 2016-04-02 at 08:30 +0200, Sedat Dilek wrote:
>>> > I am trying CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y from
>>> > linux-pm.git#linux-next out of curiosity...
>>> >
>>> > $ ./scripts/diffconfig /boot/config-$(uname -r) .config
>>> >  CPU_FREQ_DEFAULT_GOV_PERFORMANCE y -> n
>>> > +CPU_FREQ_DEFAULT_GOV_SCHEDUTIL y
>>> > +CPU_FREQ_GOV_ATTR_SET y
>>> > +CPU_FREQ_GOV_SCHEDUTIL y
>>> >
>>> > ...will report.
>>> >
>>>
>>> Not sure why I see here "powersave".
>>> Does Intel-PState driver not support CPU_FREQ_GOV_SCHEDUTIL?
>>>
>>> $ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
>>> intel_pstate
>>> intel_pstate
>>> intel_pstate
>>> intel_pstate
>>>
>>> $ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
>>> powersave
>>> powersave
>>> powersave
>>> powersave
>>
>> If you are using Ubuntu, the OS has a script which will automatically
>> change from performance.
>> Doug can give more information on this script.
>>
>> Thanks,
>> Srinivas
>>
>>
>>
>>>
>>> See also attached files.
>>>
>>> - sed@ -
>
> maybe:
> /etc/init.d/ondemand
>

With CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y (linux-pm.git#linux-next) I get...

$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq
acpi-cpufreq

$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
ondemand
ondemand
ondemand
ondemand

...is there a difference when using intel_pstate as scaling_driver?
Are the scripts of Ubuntu working properly with acpi-cpufreq (only)?

- Sedat -