[Bug 42671] New: cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

[Bug 42671] New: cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=42671

           Summary: cpufreq userspace governor doesn't work on Intel Core
                    2 Gen 2 CPUs
           Product: Power Management
           Version: 2.5
    Kernel Version: All known
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: t.artem@mailcity.com
        Regression: No


On my Intel Core i5 2500 CPU with acpi-cpufreq module loaded I do this

# echo 2000000 | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_setspeed

then

# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
2000000
2000000
2000000
2000000

so theoretically it should work.

However i7z (http://code.google.com/p/i7z/) shows that CPU frequency is freely
floating and turbo boost gets enabled as soon as I have any discernible load,
in other words userspace CPU frequency driver doesn't work at all and it
doesn't really enforce the specified CPU frequency.

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[Bug 42671] cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=42671


Len Brown <lenb@kernel.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |lenb@kernel.org




--- Comment #1 from Len Brown <lenb@kernel.org>  2012-01-31 02:58:30 ---
are you sure that you are using the userspace governor?
few people do, as it is generally obsolted by ondemand.

When ondemand is running, scaling_setspeed does nothing,
and you can "manually" control what ondemand does by
setting its maximum and minimum frequencies.

Please show the output from
grep .  /sys/devices/system/cpu/cpu0/cpufreq/*

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[Bug 42671] cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=42671





--- Comment #2 from Artem S. Tashkinov <t.artem@mailcity.com>  2012-01-31 06:57:41 ---
(In reply to comment #1)
> are you sure that you are using the userspace governor?
> few people do, as it is generally obsolted by ondemand.
> 
> When ondemand is running, scaling_setspeed does nothing,
> and you can "manually" control what ondemand does by
> setting its maximum and minimum frequencies.
> 
> Please show the output from
> grep .  /sys/devices/system/cpu/cpu0/cpufreq/*

/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit:3301000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:3301000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:3301000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:1600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency:10000
/sys/devices/system/cpu/cpu0/cpufreq/related_cpus:0 1 2 3
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:3301000
3300000 3200000 3100000 3000000 2900000 2800000 2700000 2600000 2500000 2400000
2300000 2200000 2100000 2000000 1600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:ondemand
powersave userspace conservative performance
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:2000000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:acpi-cpufreq
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:userspace
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:3301000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:1600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:2000000

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[Bug 42671] cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=42671


Artem S. Tashkinov <t.artem@mailcity.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED




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[Bug 42671] cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

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https://bugzilla.kernel.org/show_bug.cgi?id=42671





--- Comment #3 from Artem S. Tashkinov <t.artem@mailcity.com>  2012-02-07 09:14:56 ---
Is there any other information I can provide to help resolve this bug, Len?

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[Bug 42671] cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=42671


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
         AssignedTo|cpufreq@vger.kernel.org     |rjw@sisk.pl




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