https://bugzilla.kernel.org/show_bug.cgi?id=42772
Summary: thermal zone throttling is broken with multicore
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Thermal
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Manufacturer: Acer
Product Name: Aspire 1830T
On Intel CPUs the processor typically uses the highest frequency
set by any logical CPU. When the system overheats
Linux first forces the frequency to the lowest available one
to lower the temperature.
However this was done only per logical CPU, which means all
logical CPUs in a package would need to go through this before
the frequency is actually lowered.
Worse this delay actually prevents real throttling, because
the real throttle code only proceeds when the lowest frequency
is already reached.
So when a throttle event happens force the lowest frequency
for all CPUs in the package where it happened. The per CPU
state is now kept per package, not per logical CPU. An alternative
would be to do it per cpufreq unit, but since we want to bring
down the temperature of the complete chip it's better
to do it for all.
Fix
http://permalink.gmane.org/gmane.linux.kernel/1249401
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