Re: CPU Frequencies Don't scale independently
Hi,
On Sun, 29 Jun 2008, Hakan BAYINDIR <hakan@bayindir.org> writes:
> I'm running debian testing on a Intel Core2Quad Q6600 CPU with 4
> gigabytes of RAM for 7 months. Until 2.6.22, the kernel was scaling each
> of my cores independently of each other but starting with 2.6.22, every
> core is running in the same frequency. While this doesn't pose any
> stability or performance issues, causes higher temprature and noise when
> I run a single threaded computing intensive job.
>
> I tracked the cause a bit. I was able to dig upto
> "/sys/devices/system/cpu/cpuX/cpufreq/affected_cpus". This file says
> which CPUs should scale together. Since file is read only even to root I
> think it's an unconfigurable option. I also found that cpu frequencies
> are adjusted by cpufreq_acpi module and I cannot find any configuration
> related to it files in my system (with my current knowledge).
>
> The weird thing is I'm running an exact clone of this system in my
> office with a core2duo system which scales its cores independently. I
> cloned my home system to the office when I was running an Athlon64,
> approximately 1.5 years ago.
>
> If anybody can say what is wrong, is it the expected behavior, where
> should I look further, or whom I can talk to?
>
> BTW, I'm running 2.6.24-1-686-bigmem kernel prepackaged from debian testing.
Did you solve your problem? I may recommend you to read files under
linux/Documentation/cpu-freq directory. BTW, sending your
/proc/config.gz might be helpful.
Regards.
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