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To: acpi-jp@jp.FreeBSD.org, eric@yikes.com
From: Mitsuru IWASAKI <iwasaki@jp.FreeBSD.org>
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Date: Sat, 30 Nov 2002 12:41:24 +0900
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Subject: [acpi-jp 2006] Re: ACPI Questions
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Hi,

> How long does it take to change the CPU speed after changing
> hw.acpi.cpu.*? 

Immediately :)

% sysctl hw.acpi.cpu
hw.acpi.cpu.max_speed: 8
hw.acpi.cpu.current_speed: 8
hw.acpi.cpu.performance_speed: 8
hw.acpi.cpu.economy_speed: 4

Here, what you can change is only performance_speed and economy_speed.
max_speed and current_speed are read-only.
Please refer /sys/dev/acpica/acpi_cpu.c.

> Are there really 8 levels of cpu performance?  I was under the
> impression that the PIII Mobile really only had two...  Is there any
> easy way to find the current CPU speed, voltage or bus speed?

I want to know that too...

Thanks
