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SubjectRE: cpufreq userspace governor does not reflect changes

>-----Original Message-----
>From: Dhaval Giani []
>Sent: Friday, November 17, 2006 11:48 AM
>To: Pallipadi, Venkatesh
>Subject: Re: cpufreq userspace governor does not reflect changes
>On 11/18/06, Pallipadi, Venkatesh
><> wrote:
>> /sys/devices/....../cpuX/cpufreq/scaling_cur_freq
>> Gives you the information about last frequency that Linux
>tried to set
>> on this CPU
>> /sys/devices/....../cpuX/cpufreq/cpuinfo_cur_freq
>> (When supported) Gives you the information about actual
>frequency that
>> the CPU is running at.
>> Zero frequency value below is certainly a bug in the driver.
>What is the
>> kernel you are using?
>Ooops! sorry missed that one. Its the 2.6.19-rc5-mm2. Its having the
>same .config which i posted on the bugzilla. Do you want the acpidump

Not really. There were couple of fixes that went in recently. I can send
pointers to those to you.

>> On the particular CPU you have here, all cores in a package
>indeed share
>> the frequency. But, it does not really show up in
>affected_cpus as OS is
>> not coordinating the shared-ness of P-state across cores.
>That means, OS
>> programs each core individually based on CPU utilization and hardware
>> will pick the highest frequency among the two and run both
>cores at that
>> frequency.
>Hold on, so let me get it right. When i do an echo 1596000 >
>/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed, the cpu cores
>will still be running at 1.86 Ghz since the other core is at that
>frequency? In this situation how do I then change the frequency?

Yes. You just have to change the frequency on both the cores.

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