Re: Intel Clovertown vs. frequency scaling

[Jarod Wilson <jwilson@redhat.com>]

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Stephen J. Gowdy wrote:
> I have a quad-core version that uses the centrino one (E5345). However,
> it only has two available speeds, 2GHz and 2.33GHz. Do you get more
> options?
> 
> [pcphuat27] ~ > cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
> centrino
> [pcphuat27] ~ > cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
> 2333000 2000000

Not a heck of a lot more, but a bit more.

[jwilson@xeus ~]$ cat sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
acpi-cpufreq
[jwilson@xeus ~]$ cat
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
2660000 2128000 1596000

FYI, unless I'm mistaken, the speedstep-centrino driver is supposed to
be getting deprecated in favor of acpi-cpufreq.


> Andras.Horvath@cern.ch wrote:
>> I have a number of Clovertown (intel quadcore) machines and, even with
>> the latest 2.6.23, it seems to me that frequency scaling is not
>> supported (e.g. the /sys/devices/system/cpu/cpu0/cpufreq/* stuff does
>> not appear even though CONFIG_X86_SPEEDSTEP_CENTRINO is "y").
> 
> I believe you want acpi-cpufreq, not speedstep-centrino. Works just fine
> for my quad-core systems, anyhow. If that doesn't work, its probably the
> bios at fault.


-- 
Jarod Wilson
jwilson@redhat.com



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