Re: acpi_processor.c - kernel 2.6.1

[Luca Capello <luca-wlebWZzHoyE@public.gmane.org>]

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Hello,

on 01/18/04 12:18, Yury V. Umanets wrote:
> I guess, that there is no code in kernel, which does watch current
> loading and adjust CPU speed. Also this is job for a cpufreq governor,
> not for CPU driver.
>
> For now, there are three governors:
> (1) powersave -- setting CPU frequency statically to lowest available
> frequency.
> (2) performance -- setting to highest available frequency.
> (3) userspace -- used for setting CPU frequency manually.
>
> Probably there also should be number (4), which will set it basing on
> current loading.
some questions and/or suggestions for kernel 2.6.1:

- - 'Power management option (ACPI, APM)' should be changed in 'Power
management option (ACPI, APM, CPUFreq)'

- - why 'Power management option > CPU Frequency scaling > Default CPUFreq
governor' shows only 'performance|userspace' and not also 'powersave'?

- - here my config section for 'Power management option > CPU Frequency
scaling':
> #
> # CPU Frequency scaling
> #
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_PROC_INTF=y
> CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
> CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
> CONFIG_CPU_FREQ_GOV_POWERSAVE=m
> CONFIG_CPU_FREQ_GOV_USERSPACE=m
> # CONFIG_CPU_FREQ_24_API is not set
> CONFIG_CPU_FREQ_TABLE=y

as I didn't know (I had never read docs before and the help from 'make
menuconfig' isn't complete IMHO), I've never load the
'cpufreq_userspace' module, even if I was thinking to use the
'cpufreqd'. If I've correctly understood, 'cpufreqd' need the
'userspace' option/module to work, right? So, why even without the
'userspace' module loaded, is 'cpufreqd' working? I can see it via
/proc/cpuinfo plugging in/out the AC-Adapter.

- - what does loading 'cpufreq_' modules cause? I can see no differences
when I load 'cpufreq_[powersave|userspace]'...

I finished, for now :-)

Thx, bye,
Gismo / Luca
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