[Bug 12482] Change cpufreq_ondemand to tread SCHED_IDLE time as idle time

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https://bugzilla.kernel.org/show_bug.cgi?id=12482


Robert Bradbury <robert.bradbury@xxxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |robert.bradbury@xxxxxxxxx




--- Comment #10 from Robert Bradbury <robert.bradbury@xxxxxxxxx>  2010-06-25 07:15:41 ---
Comments on Gentoo Bug #287463 and Kernel Bugs #14066,  #14771 and #16072 may
be related to this.  It is clear from my experience with cpufreq_ondemand and
acpi-cpufreq since Linux 2.6.30 is that there are very few people who really
understand the issues involved here.  The general tone from the "kernel"
developers seems to be that cpufreq_ondemand (and indirectly p4-clockmod.c) are
"deprecated" in favor of using acpi-cpufreq.  This is without taking into
account that for acpi-cpufreq to work correctly it needs an Enhanced Intel
Speedstep processor *and* a compatible ACPI BIOS with _PCT code(*) -- and there
are a *lot* (presumably millions) of machines in the world for which this is
not the case.

* This only applies to machines with Intel Pentium class processors presumably.

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