[Bug 10055] New: conservative governor doesn't increase frequency, just decrease. powernow-k7

[Bug 10055] New: conservative governor doesn't increase frequency, just decrease. powernow-k7

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10055

           Summary: conservative governor doesn't increase frequency, just
                    decrease. powernow-k7
           Product: Power Management
           Version: 2.5
     KernelVersion: 2.6.24.2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@www.linux.org.uk
        ReportedBy: borych@gmx.de


Latest working kernel version:2.6.23.16
Earliest failing kernel version:2.6.24
Distribution:Gentoo
Hardware Environment:mitac 8375 Athlon XP-M 2800+

Problem Description: kernel 2.6.24.2, conservative governor compiled in
(doesn't matter whether module or not). If I set conservative as current
governor (either via cpufreq-utils or set it as default governor in kernel) the
CPU frequency decreases slowly at low CPU load as it ought to be. But if I put
the CPU on high load then,the frequency remains unchanged. 
Conservative is working on 2.6.23.*, ondemand works even on 2.6.24 CPU
frequency module is powernow-k7 compiled in as module.

Steps to reproduce:
1.compile kernel with conservative governor
2.set it as current governor
3.put CPU on high load


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10055


akpm@osdl.org changed:

           What    |Removed                     |Added
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                 CC|                            |davej@codemonkey.org.uk
         Regression|0                           |1




------- Comment #1 from akpm@osdl.org  2008-02-20 15:52 -------
marked as a regression..


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10055


davej@codemonkey.org.uk changed:

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                 CC|                            |trenn@suse.de




------- Comment #2 from davej@codemonkey.org.uk  2008-02-20 16:44 -------
Most obvious candidate for a problematic diff would be this patch I guess..

commit 1c2562459faedc35927546cfa5273ec6c2884cce
Author: Thomas Renninger <trenn@suse.de>
Date:   Tue Oct 2 13:28:12 2007 -0700

    [CPUFREQ] allow ondemand and conservative cpufreq governors to be used as
default

    Depending on the transition latency of the HW for cpufreq switches, the
    ondemand or conservative governor cannot be used with certain cpufreq
    drivers.  Still the ondemand should be the default governor on a wide range
    of systems.  This patch allows this and lets the governor fallback to the
    performance governor at cpufreq driver load time, if the driver does not
    support fast enough frequency switching.

    Main benefit is that on e.g.  installation or other systems without
    userspace support a working dynamic cpufreq support can be achieved on most
    systems by simply loading the cpufreq driver.  This is especially essential
    for recent x86(_64) laptop hardware which may rely on working dynamic
    cpufreq OS support.



Looking through it though, I'm not entirely clear how it could be at fault.


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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http://bugzilla.kernel.org/show_bug.cgi?id=10055


alex-kernel@digriz.org.uk changed:

           What    |Removed                     |Added
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                 CC|                            |alex-kernel@digriz.org.uk




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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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http://bugzilla.kernel.org/show_bug.cgi?id=10055


dsd@gentoo.org changed:

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                 CC|                            |kernel@gentoo.org




------- Comment #3 from dsd@gentoo.org  2008-02-24 15:01 -------
downstream bug report
https://bugs.gentoo.org/show_bug.cgi?id=210747
(identical, link for reference only)


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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me@tiagocunha.org changed:

           What    |Removed                     |Added
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                 CC|                            |me@tiagocunha.org




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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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http://bugzilla.kernel.org/show_bug.cgi?id=10055


protasnb@gmail.com changed:

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                 CC|                            |protasnb@gmail.com




------- Comment #4 from protasnb@gmail.com  2008-06-01 16:57 -------
Eric, is this still a problem with current kernel?
If so, you can try enabling CPU_FREQ_DEBUG in the config and either boot with
cpufreq.debug=X or load cpufreq with debug=X parameter, where X is 1(core)
2(driver) or 4(governor) debug.


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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http://bugzilla.kernel.org/show_bug.cgi?id=10055





------- Comment #5 from alex-kernel@digriz.org.uk  2008-06-01 17:19 -------
Could you try the patch on:
http://bugzilla.kernel.org/show_bug.cgi?id=8081


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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art-kbt@broomstick.com changed:

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                 CC|                            |art-kbt@broomstick.com




------- Comment #6 from art-kbt@broomstick.com  2008-07-29 01:37 -------
Still a problem with 2.6.25

Alex:  This is NOT the same bug as with conservative climbing extremely slowly
due to a high scaling_min value.  In this case, it will not climb AT ALL --
even hours pegged at 100%, and it will stay at the same frequency.  The bug you
reference also appeared much earlier -- this one appeared with 2.6.24, and
2.6.23 is fine.


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10055





------- Comment #7 from art-kbt@broomstick.com  2008-07-29 02:04 -------
Created an attachment (id=17022)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=17022&action=view)
kern log for cpufreq scaling not working

Kernel log for cpufreq conservative scaling not working, cpufreq.debug=7.  For
the last few minutes of this log, the CPU was pegged at 95-100%, yet the
frequency stood still at the lowest possible value.


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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7

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http://bugzilla.kernel.org/show_bug.cgi?id=10055


art-kbt@broomstick.com changed:

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  Attachment #17022|application/octet-stream    |text/plain
          mime type|                            |




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