[Bug 19672] New: ondemand is slow

[Bug 19672] New: ondemand is slow

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=19672

           Summary: ondemand is slow
           Product: Power Management
           Version: 2.5
    Kernel Version: 2.6.35
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: danielhollocher@gmail.com
        Regression: No


I find ondemand is allot slower than conservative for cpu bound tasks.  My
understanding is that performance wise, ondemand should be on par or slightly
faster than conservative.

My chip is an intel core 2 duo, I think 4300.  I am using 2.6.35 from Ubuntu.

On the kraken benchmark, ondemand completes in   34216.6ms +/- 2.3%   where as
conservative completes in   25699.3ms +/- 5.6%


Again, it is my understanding that ondemand should not have this much of a
slowdown.

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[Bug 19672] ondemand is slow

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=19672


Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |florian@mickler.org
         Resolution|                            |CODE_FIX




--- Comment #1 from Florian Mickler <florian@mickler.org>  2011-01-24 13:01:27 ---
a fix for this has been merged in .37-rc1:
commit 3f78a9f7fcee0e9b44a15f39ac382664e301fad5
Author: David C Niemi <dniemi@verisign.com>
Date:   Wed Oct 6 16:54:24 2010 -0400

    [CPUFREQ] add sampling_down_factor tunable to improve ondemand performance

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[Bug 19672] ondemand is slow

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=19672


Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED




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