[Bug 55091] New: cpufreq governors woks crazy

[Bug 55091] New: cpufreq governors woks crazy

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=55091

           Summary: cpufreq governors woks crazy
           Product: Power Management
           Version: 2.5
    Kernel Version: 3.9-rc2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: towo@siduction.org
        Regression: No


Since i test kernel 3.9-rc2, cpufreq is crazy with governors ondemand and
conservative.
Even if the system is idling, cpufreq is on the highest or medium frequency.
Only with powersafe i can get the cpu to the lowest frequency.

This behavior i cant see in 3.8 or below.

Here the output from cpufreq-info:

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0 1 2 3
  maximum transition latency: 10.0 us.
  hardware limits: 1.60 GHz - 2.66 GHz
  available frequency steps: 2.66 GHz, 2.13 GHz, 1.60 GHz
  available cpufreq governors: powersave, conservative, userspace, ondemand,
performance
  current policy: frequency should be within 1.60 GHz and 2.66 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz.
  cpufreq stats: 2.66 GHz:3.10%, 2.13 GHz:3.09%, 1.60 GHz:93.81%  (8123)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0 1 2 3
  maximum transition latency: 10.0 us.
  hardware limits: 1.60 GHz - 2.66 GHz
  available frequency steps: 2.66 GHz, 2.13 GHz, 1.60 GHz
  available cpufreq governors: powersave, conservative, userspace, ondemand,
performance
  current policy: frequency should be within 1.60 GHz and 2.66 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz.
  cpufreq stats: 2.66 GHz:3.10%, 2.13 GHz:3.09%, 1.60 GHz:93.81%  (8123)
analyzing CPU 2:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0 1 2 3
  maximum transition latency: 10.0 us.
  hardware limits: 1.60 GHz - 2.66 GHz
  available frequency steps: 2.66 GHz, 2.13 GHz, 1.60 GHz
  available cpufreq governors: powersave, conservative, userspace, ondemand,
performance
  current policy: frequency should be within 1.60 GHz and 2.66 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz.
  cpufreq stats: 2.66 GHz:3.10%, 2.13 GHz:3.09%, 1.60 GHz:93.81%  (8123)
analyzing CPU 3:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0 1 2 3
  maximum transition latency: 10.0 us.
  hardware limits: 1.60 GHz - 2.66 GHz
  available frequency steps: 2.66 GHz, 2.13 GHz, 1.60 GHz
  available cpufreq governors: powersave, conservative, userspace, ondemand,
performance
  current policy: frequency should be within 1.60 GHz and 2.66 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz.
  cpufreq stats: 2.66 GHz:3.10%, 2.13 GHz:3.09%, 1.60 GHz:93.81%  (8123)

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[Bug 55091] cpufreq governors woks crazy

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https://bugzilla.kernel.org/show_bug.cgi?id=55091


Viresh Kumar <viresh.kumar@linaro.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |viresh.kumar@linaro.org




--- Comment #1 from Viresh Kumar <viresh.kumar@linaro.org>  2013-03-12 11:15:49 ---
Hi,

I was the guy behind most of the cpufreq core updates in this kernel release. I
haven't tried to reproduce the problem you got (was very busy with some other
activity), but i am trying to analyse what may cause it. Following are the
important updates that i can make out from: 'git diff v3.8..v3.9-rc2'

- Locking Fixes
- policy->cpus and policy->related_cpus fixups
- simplification of cpu hotplug path in cpufreq core
- removing redundant code between governors

I don't really think any of the above can cause this problem, unless there is a
bug somewhere.

- per cpu timer for both ondemand and conservative:

commit 2abfa876f1117b0ab45f191fb1f82c41b1cbc8fe
Author: Rickard Andersson <rickard.andersson@stericsson.com>
Date:   Thu Dec 27 14:55:38 2012 +0000

    cpufreq: handle SW coordinated CPUs

    This patch fixes a bug that occurred when we had load on a secondary CPU
    and the primary CPU was sleeping. Only one sampling timer was spawned
    and it was spawned as a deferred timer on the primary CPU, so when a
    secondary CPU had a change in load this was not detected by the cpufreq
    governor (both ondemand and conservative).

    This patch make sure that deferred timers are run on all CPUs in the
    case of software controlled CPUs that run on the same frequency.



This can be behind all the problem you are facing. Can you try reverting all
patches including and after this patch?

If any of the cpu is loaded enough, then you will see some freq used (based on
the load). Whereas, earlier if cpu0 goes down, then we were just not
re-evaluating load at all.

--
viresh

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[Bug 55091] cpufreq governors woks crazy

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Aaron Lu <aaron.lu@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aaron.lu@intel.com
         AssignedTo|cpufreq@vger.kernel.org     |aaron.lu@intel.com




--- Comment #2 from Aaron Lu <aaron.lu@intel.com>  2013-03-26 07:44:56 ---
Hi towo,

Can you please follow Viresh's suggestion in comment #1 to test out? Thanks.

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[Bug 55091] cpufreq governors woks crazy

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Aaron Lu <aaron.lu@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
         AssignedTo|aaron.lu@intel.com          |cpufreq@vger.kernel.org




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[Bug 55091] cpufreq governors woks crazy

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--- Comment #3 from towo@siduction.org  2013-03-26 16:39:46 ---
Sorry for the long delay, but it seems all is good.
If i check the frewuency with

watch -n 0,5 cpufreq-info

all is good, only conky is showing those fancy freqency changes.
So i would resume, it's conky's fault.

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[Bug 55091] cpufreq governors woks crazy

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https://bugzilla.kernel.org/show_bug.cgi?id=55091


Aaron Lu <aaron.lu@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|cpufreq@vger.kernel.org     |aaron.lu@intel.com




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