Re: P States

On Tue, Aug 31, 2004 at 11:41:25AM -0000, Sreenidhi  BG wrote:
> hello All, 
> I recently bought a Pentium M IBM thinkpad. It is running on Linux, SuSe 9.1 with 2.6.4 kernel.
> 
> I dont see the "performance" entry in my "proc/acpi/processor/CPU0/performance" interface.

Possibly because not the native ACPI cpufreq [see below] driver is used, but
the speedstep-centrino driver.

> I have enabled the PowerManagement section in Linux Kernel, recompiled and
> booted with my new kernel. But still I dont see the "performance" entry in
> my /proc interface.
Have you enabled CONFIG_CPU_FREQ ? and CONFIG_X86_SPEEDSTEP_CENTRINO ?

> How do I know at what frequency is my CPU running?
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

> Any pointers to any utilities/resources will be of great help.
a) upgrade the kernel to 2.6.7 or later
b) read the file Documentation/cpu-freq/user-guide.txt
c) compile the kernel with the following (preferred) settings:

CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_TABLE=y
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
CONFIG_X86_SPEEDSTEP_CENTRINO=y
CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE=y
CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI=y


	Dominik


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