New: cpufreq userspace governor doesn't work on Intel Core 2 Gen 2 CPUs
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: [email protected]
ReportedBy: [email protected]
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
https://bugzilla.kernel.org/show_bug.cgi?id=42671
Len Brown <[email protected]> changed:
What |Removed |Added
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Status|NEW |NEEDINFO
CC| |[email protected]--- Comment #1 from Len Brown <[email protected]> 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
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=42671
--- Comment #2 from Artem S. Tashkinov <[email protected]> 2012-01-31 06:57:41 --- (In reply to comment #1)
Quoted 9 lines
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_setspeeddoes 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
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=42671
Artem S. Tashkinov <[email protected]> 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
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=42671
--- Comment #3 from Artem S. Tashkinov <[email protected]> 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
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=42671
Alan <[email protected]> changed:
What |Removed |Added
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CC| |[email protected] AssignedTo|[email protected] |[email protected]
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