http://bugzilla.kernel.org/show_bug.cgi?id=12651
venkatesh.pallip...@intel.com changed:
What |Removed |Added
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AssignedTo|acpi_power-proces...@kernel-|venkatesh.pallip...@intel.co
|bugs.osdl.org |m
Status|NEW |ASSIGNED
------- Comment #4 from venkatesh.pallip...@intel.com 2009-02-09 14:19 -------
Vladimir.
Nice detective work :-).
Looks like "nohz" is not correctly turning off hz on one of the CPUs here. As a
result, ondemand thinks CPU is busy. Even if ondemand goes to lower freq, you
may still be spending more power due to constant ticks on this CPU0. So, the
problem may be bigger than ondemand itself.
Can you look at /proc/interrupts, specifically IRQ 0: and LOC lines and see how
many interrupts are going to each CPU. Also see whether that is changing with
.27 and .28
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