powerd: How to really disable acpi_throttle?

[Nate Lawson]

Ulrich Spoerlein wrote:
> Hi guys,
> 
> I put
> 
> hint.acpi_perf.0.disabled="1"
> hint.acpi_throttle.0.disabled="1"
> 
> into /boot/loader.conf and /boot/device.hints, but the acpi_throttle
> module still seems to attach
> 
> % dmesg|grep cpu
> cpu0: <ACPI CPU> on acpi0
> est0: <Enhanced SpeedStep Frequency Control> on cpu0
> p4tcc0: <CPU Frequency Thermal Control> on cpu0

acpi_throttle and p4tcc are different drivers.  So:

hint.p4tcc.0.disabled="1"

> Btw, who decides how those frequencies are chosen? Is the 600MHz setting
> made by 600MHz-EST * 100% throttle or is it 1200MHz-EST and 50%
> throttle?

There is a optimization phase in cpufreq that prefers frequencies 
generated by absolute drivers more than relative.  So 600 * 100% would 
be chosen, not 1200 * 50%.

-- 
Nate