CPU Performance Management

CPU Performance Management

[Ryan May]

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Hi,

I have a Toshiba 2415-s205 with a P4M-2.0GHz and have recently been toying with ACPI support in the linux kernel.  So far, I have gotten two versions running: The 2.5.66 kernel with the 20030328 ACPI patch and the 2.4.20 kernel with the 20021222 ACPI patch.  Neither of the kernels have any other patches applied.

I am happy to see that (with a quick look) many features work well, except for an issue with the 20030328 patch.  When I cat /proc/acpi/processor/CPU0/info I get the following output:

processor id:                      0
acpi id:                              1
bus mastering control:        yes
power management:           yes
throttling control:                no
performance management:  no
limit interface:                    no

Knowing that I have a P4M, I would have expected to have the option of performance management.  Indeed, on the 20021212 patch on a 2.4.20 kernel, I have both performance management and limit interface enabled.  Anyone have any clue what changed to actually disable performance management?

I've tried disassembling and recompiling my DSDT (using iasl 20030228);  It gives me three identical warnings:

Package (0x00) {},
                    ^ Effective AML package length is zero

Could this be my problem?

Any help would be greatly appreciated.

Ryan May

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RE: CPU Performance Management

[Grover, Andrew]

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We moved the processor performance stuff to the cpufreq interface. I think
the fact that we still list it in info is a bug.
 
Regards -- Andy

-----Original Message-----
From: Ryan May [mailto:rmay-GrrYUJ3DTa8@public.gmane.org] 
Sent: Tuesday, April 01, 2003 7:34 PM
To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: [ACPI] CPU Performance Management


Hi,
 
I have a Toshiba 2415-s205 with a P4M-2.0GHz and have recently been toying
with ACPI support in the linux kernel.  So far, I have gotten two versions
running: The 2.5.66 kernel with the 20030328 ACPI patch and the 2.4.20
kernel with the 20021222 ACPI patch.  Neither of the kernels have any other
patches applied.
 
I am happy to see that (with a quick look) many features work well, except
for an issue with the 20030328 patch.  When I cat
/proc/acpi/processor/CPU0/info I get the following output:
 
processor id:                      0
acpi id:                              1
bus mastering control:        yes
power management:           yes
throttling control:                no
performance management:  no
limit interface:                    no
 
Knowing that I have a P4M, I would have expected to have the option of
performance management.  Indeed, on the 20021212 patch on a 2.4.20 kernel, I
have both performance management and limit interface enabled.  Anyone have
any clue what changed to actually disable performance management?
 
I've tried disassembling and recompiling my DSDT (using iasl 20030228);  It
gives me three identical warnings:
 
Package (0x00) {},
                    ^ Effective AML package length is zero
 
Could this be my problem?
 
Any help would be greatly appreciated.
 
Ryan May
 


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