Re: About p4-clockmod breakage/removal

Matthew Garrett
2008-05-14T09:34:08Z

On Tue, May 13, 2008 at 11:35:32PM -0400, Len Brown wrote:

> cpufreq is not designed to manage thermals, and putting p4_clockmod
> underneath it to manage thermals is a mistake.

Check processor_thermal.c. It explicitly interfaces with cpufreq in
order to perform P state management.

> There is already a well known thermal throttling interface
> available via ACPI and it does not need p4_clockmod to run.
> Passive trip points work automatically even without cpufreq being present.
> If they do not, then we need to fix them.

You're assuming that the throttling interface is always exposed via
ACPI. I've seen machines where this isn't the case.

--
Matthew Garrett | mjg59@srcf.ucam.org