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

From Jörg Otte <jrg.otte@gmail.com>
Newsgroups linux.kernel
Subject Re: [intel-pstate driver regression] processor frequency very high even if in idle
Date 2016-03-30 12:20 +0200
Message-ID <riloe-3NH-23@gated-at.bofh.it> (permalink)
References <ri5Mt-14H-3@gated-at.bofh.it> <ri5Mt-14H-1@gated-at.bofh.it> <ri9wJ-3Fl-9@gated-at.bofh.it>
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2016-03-29 23:34 GMT+02:00 Rafael J. Wysocki <rjw@rjwysocki.net>:
> On Tuesday, March 29, 2016 07:32:27 PM Jörg Otte wrote:
>> 2016-03-29 19:24 GMT+02:00 Jörg Otte <jrg.otte@gmail.com>:
>> > in v4.5 and earlier intel-pstate downscaled idle processors (load
>> > 0.1-0.2%) to minumum frequency, in my case 800MHz.
>> >
>> > Now in v4.6-rc1 the characteristic has dramatically changed. If in
>> > idle the processor frequency is more or less a few MHz around 2500Mhz.
>> > This is the maximum non turbo frequency.
>> >
>> > No difference between powersafe or performance governor.
>> >
>> > I currently use acpi_cpufreq which works as usual.
>> >
>> > Processor:
>> > Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz (family: 0x6, model: 0x3c,
>> > stepping: 0x3)
>> >
>> > Last known good kernel is: 4.5.0-01127-g9256d5a
>> > First known bad kernel is: 4.5.0-02535-g09fd671
>> >
>> > There is
>> > commit 277edba Merge tag 'pm+acpi-4.6-rc1-1' of
>> > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
>> > in between, which brought a few changes in intel_pstate.
>
> Can you please check commit a4675fbc4a7a (cpufreq: intel_pstate: Replace timers
> with utilization update callbacks)?
>
Yes , this solved the problem for me.
I had to resolve some conflicts myself when reverting that
commit. Hard work :).

Here is a 10-seconds trace of the used frequencies when
in "desktop-idle":

driver          cpu0 cpu1 cpu2 cpu3
-------------------------------------
intel_pstate (  800  928  941 1200) MHz   load:( 0.2)%
intel_pstate (  800  928 1181 1800) MHz   load:( 0.0)%
intel_pstate ( 1675 1576 1347  800) MHz   load:( 0.0)%
intel_pstate ( 1198 1576  842  800) MHz   load:( 0.5)%
intel_pstate (  800 1181 1113 1600) MHz   load:( 0.0)%
intel_pstate (  808 1181  805  800) MHz   load:( 0.5)%
intel_pstate (  844 1191  900 1082) MHz   load:( 0.3)%
intel_pstate (  816 1191  800  800) MHz   load:( 0.0)%
intel_pstate (  800  905  892 1082) MHz   load:( 0.2)%
intel_pstate (  945  905 1340  800) MHz   load:( 0.3)%


Thanks, Jörg

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Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-29 19:40 +0200
  Re: [intel-pstate driver regression] processor frequency very high even if in idle "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-29 23:40 +0200
    Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-30 12:20 +0200
      Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-30 13:10 +0200
        Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-30 17:30 +0200
          Re: [intel-pstate driver regression] processor frequency very high even if in idle "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-30 20:40 +0200
            Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-31 11:10 +0200
              Re: [intel-pstate driver regression] processor frequency very high even if in idle "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-31 13:50 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-31 17:30 +0200
                Re: [intel-pstate driver regression] processor frequency very high even if in idle "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-31 17:50 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-03-31 18:20 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-31 19:30 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-03-31 20:00 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-01 02:10 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-04-01 11:50 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-04-01 17:10 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-01 22:30 +0200
                Re: [intel-pstate driver regression] processor frequency very high even if in idle "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-01 14:40 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-04-01 16:10 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-04-01 19:50 +0200
                RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-04-01 20:40 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-04-01 20:50 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-01 22:00 +0200
                RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-04-02 01:40 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-02 02:30 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-01 22:30 +0200
                RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-04-01 17:30 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-04-01 18:50 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-04-01 19:40 +0200
        Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Pandruvada, Srinivas" <srinivas.pandruvada@intel.com> - 2016-03-30 17:40 +0200
          Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-30 18:00 +0200
            Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-03-30 21:00 +0200
              Re: [intel-pstate driver regression] processor frequency very high  even if in idle "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-30 22:20 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-03-30 22:30 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Jörg Otte <jrg.otte@gmail.com> - 2016-03-31 11:30 +0200
                RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-03-31 16:40 +0200
                RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-03-31 17:20 +0200
                Re: [intel-pstate driver regression] processor frequency very high  even if in idle Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-03-31 17:20 +0200
                RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-04-01 09:30 +0200
            RE: [intel-pstate driver regression] processor frequency very high even if in idle "Doug Smythies" <dsmythies@telus.net> - 2016-03-30 21:00 +0200

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