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

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Date:	Fri, 20 Oct 2006 00:25:48 +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:
>> Hello,
>> 
>> I have just noticed that enabling cpufreq on my Dell PowerEdge 1425SC 
>> changes my secondary cpu clock to 2.8GHz.
>
> [snip]
>
>> # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
>> p4-clockmod
>
> You shouldn't be using this driver. Use speedstep-centrino or

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

> acpi-cpufrreq.

I will check this, thank you. BTW: what wrong is with p4-clockmod? I was 
not able to find any information that it is broken and should not be 
used?

Best regards,

 				Krzysztof Olędzki