https://bugzilla.kernel.org/show_bug.cgi?id=17291
Len Brown <l...@kernel.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |acpi-bugzi...@lists.sourcef
| |orge.net
Component|intel_idle |Power-Processor
AssignedTo|l...@kernel.org |acpi_power-proces...@kernel
| |-bugs.osdl.org
Product|Power Management |ACPI
Summary|intel_idle causes erratic |acpi_idle sees only c1 -
|coretemp readings |i7-875K
--- Comment #14 from Len Brown <l...@kernel.org> 2010-10-25 04:05:01 ---
turbostat shows that intel_idle is succeeding in getting
the package into pc6, c0 residency is 0.10%,
and the frequency drops as low as 1.2GHz.
That all looks good.
You will also find with intel_idle that if you run
a single threaded application, the that thread may
be able to run as fast as 3.6GHz, which is also good.
turbostat shows that the acpi_idle case is not getting
any deeper than c1, c0 time is over 2.00%, and
the frequency is pegged at 3.2GHz. That is not good.
The c1 limitation will prevent you from ever reaching
a frequency higher than 3.2GHz, and using only C1
is a waste of power.
While there may be lower temperatures seen with intel_idle,
and the reading may jump around, the larger bug here is
that when you use acpi_idle, it is not reaching the idle
power saving states that it should; and that will impact
both your energy savings and your maximum performance.
please attach the .config
please attach the output from acpidump.
please build with CONFIG_ACPI_DEBUG=y
and boot the acpi_idle kernel with acpi.debug_layer=0x20000000
and attach the dmesg
BTW. the output from powertop -d
on the acpi_idle case may also be useful
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