DL360 G6 Linux CPU Frequency scaling

[S G Carr]

I am unable to activate cpu frequency scaling in linux 2.6.32.2 the error is

WARNING: Error inserting acpi_cpufreq (/lib/modules/2.6.32.2/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko): No such device

The kernel was built on a Slackware 13 64bit base install.

There is no indication dmesg of the cpus supporting throttling yet it seems to be enabled in the BIOS.

The system has 2 X Intel(R) Xeon(R) CPU E5540 @ 2.53GHz stepping 05

All cores are enabled 8 in total with hyperthreading giving a total of 16 cores.

Is it a problem in Linux or am I missing something in the BIOS setup.

Linux seems to look for
/sys/devices/system/cpu/cpu0/cpufreq folder that does not exist

But there is
/sys/devices/system/cpu/cpufreq folder

Thanks
Stephen Carr

[Huc_1]

what does

ls -l /proc/cpuinfo

return ?

does the path/fi/lib/modules/2.6.32.2/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko file exist ?

Here on a fedora 12 duo core

drwxr-xr-x. 7 root root 0 2009-12-24 06:51 cpu0
drwxr-xr-x. 7 root root 0 2009-12-24 06:51 cpu1
drwxr-xr-x. 2 root root 0 2009-12-24 07:18 cpuidle
-r--r--r--. 1 root root 4096 2009-12-24 07:18 kernel_max
-r--r--r--. 1 root root 4096 2009-12-24 07:18 offline
-r--r--r--. 1 root root 4096 2009-12-24 07:18 online
drwxr-xr-x. 2 root root 0 2009-12-24 07:18 perf_counters
-r--r--r--. 1 root root 4096 2009-12-24 07:18 possible
-r--r--r--. 1 root root 4096 2009-12-24 07:18 present

Hope this helps!

enjoy, life

Jean-Pierre Huc

[Matti_Kurkela]

The acpi_cpufreq relies on the ACPI power management routines in the BIOS to actually perform the frequency scaling. Is your BIOS version up to date?

MK

[S G Carr]

It is a brand new system - I will check the version of the bios with the latest available version. I have been told to change the Power regulator to OS controlled - I may have missed the option or not aware of its impact.

Thanks
Stephen Carr