linux-kernel - Re: 3.2GHz cpus with cpufreq become 2.8GHz

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Message-ID: <Pine.LNX.4.64.0610231550570.8201@bizon.gios.gov.pl>
Date:	Mon, 23 Oct 2006 15:53:33 +0200 (CEST)
From:	Krzysztof Oledzki <olel@....pl>
To:	Wes Felter <wesley@...ter.org>
cc:	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk
Subject: Re: 3.2GHz cpus with cpufreq become 2.8GHz



On Thu, 19 Oct 2006, Wes Felter wrote:

> Krzysztof Oledzki wrote:
>
>> Hm... speedstep-centrino on Xeon? AFAIK speedstep-centrino requires "est" 
>> and /proc/cpuinfo does not mention this flag:
>>  fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 
>> clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni 
>> monitor ds_cpl cid cx16 xtpr
>
> Odd; I have a similar processor and it has est and uses the 
> speedstep-centrino driver. But I am using an old kernel (2.6.5) and the flag 
> detection has changed since then.

Anyway, I have just tested speedstep-centrino, but it does not work.

>> BTW: what wrong is with p4-clockmod? I was not able to find any information 
>> that it is broken and should not be used?
>
> It makes the processor slower but only reduces power consumption slightly, 
> making the processor less power-efficient. You probably don't want your 
> processor to be less efficient.

I also tested ACPI Processor P-States driver (X86_ACPI_CPUFREQ), but it 
does not work either.

Any other ideas?

Best regards,

 				Krzysztof Olędzki