Enabling CPU freq in a new CPU

Enabling CPU freq in a new CPU

[Kwon, Owen]

Hello

 

I am testing speedstep function with newer Intel CPU. Kernel option is
enabled at compile time, but while booting, CPUID check seemed to fail.
The message is

"p4-clockmod : Unknown p4-clockmod-capable CPU ~~~"

 

Do I need to implement additional code to test this function? Or is it
safe to bypass the CPUID check part?

 

I don't know this is required, but Kernel version is 2.6.22.

 

Thanks,

Owen

 

Owen Kwon (Ohkeun Kwon)

Technical Marketing Engineer

+82 2 767 2428 (Office)

+82 10 9034 4820 (Mobile)

Re: Enabling CPU freq in a new CPU

[Jarod Wilson]

[-- Attachment #1.1: Type: text/plain, Size: 669 bytes --]

Kwon, Owen wrote:
> I am testing speedstep function with newer Intel CPU. Kernel option is
> enabled at compile time, but while booting, CPUID check seemed to fail.
> The message is
> 
> "p4-clockmod : Unknown p4-clockmod-capable CPU ~~~"
> 
> 
> Do I need to implement additional code to test this function? Or is it
> safe to bypass the CPUID check part?
> 
> 
> I don't know this is required, but Kernel version is 2.6.22.

p4-clockmod is for much older p4 processors, and even then, often isn't
recommended for use. What you want for any reasonably new intel
processor is acpi-cpufreq, not p4-clockmod.

-- 
Jarod Wilson
jwilson@redhat.com



[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 251 bytes --]

[-- Attachment #2: Type: text/plain, Size: 147 bytes --]

_______________________________________________
Cpufreq mailing list
Cpufreq@lists.linux.org.uk
http://lists.linux.org.uk/mailman/listinfo/cpufreq

RE: Enabling CPU freq in a new CPU

[Kwon, Owen]

Acpi-cpufreq works with my CPU.
Thank you. :)

-----Original Message-----
From: Jarod Wilson [mailto:jwilson@redhat.com] 
Sent: Tuesday, October 23, 2007 9:44 PM
To: Kwon, Owen
Cc: cpufreq@lists.linux.org.uk
Subject: Re: Enabling CPU freq in a new CPU

Kwon, Owen wrote:
> I am testing speedstep function with newer Intel CPU. Kernel option is
> enabled at compile time, but while booting, CPUID check seemed to
fail.
> The message is
> 
> "p4-clockmod : Unknown p4-clockmod-capable CPU ~~~"
> 
> 
> Do I need to implement additional code to test this function? Or is it
> safe to bypass the CPUID check part?
> 
> 
> I don't know this is required, but Kernel version is 2.6.22.

p4-clockmod is for much older p4 processors, and even then, often isn't
recommended for use. What you want for any reasonably new intel
processor is acpi-cpufreq, not p4-clockmod.

-- 
Jarod Wilson
jwilson@redhat.com