cpufreq frequencies off for Core 2 Duo E6600 "Conroe"

cpufreq frequencies off for Core 2 Duo E6600 "Conroe"

[Matthias Hentges]

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Hi all,

I'm the happy user of a shiny new C2D E6600 CPU. While cpufreq works, it
only offers support for the lowest possible frequency (1596MHz)

(Linux mhcln01 2.6.19-rc1-git5-mh02 #3 SMP Tue Oct 10 01:35:05 CEST 2006
i686 GNU/Linux )

root@mhcln01:../system/cpu/cpu0/cpufreq >cat
scaling_available_frequencies 
2394000 2394000 2394000 2394000 2394000 2394000 2394000 2394000 2394000
1596000 

As I understand it, the command above should list all possible "steps"
for this CPU. The E6600 supports a multiplicator change between 6 and 9.
For a default FSB of 266 this would mean the valid steps for the CPU
are:

2394000 2128000 1862000 1596000 

There is another thing bugging me with cpufreq:
+root@mhcln01:../system/cpu/cpu0/cpufreq >cat scaling_cur_freq 
1596000
+root@mhcln01:../system/cpu/cpu0/cpufreq >cat cpuinfo_cur_freq 
1596000

Since the machine is overclocked to FSB301 (2.7GHz), the output above is
clearly wrong (should read 6 x 301 = 1806MHz). I wonder if it would be
possible to replace the output with the real frequency, not some
hard-wired frequency/vcore value?

Thanks for your time.
-- 
Matthias 'CoreDump' Hentges 

My OS: Debian SID. Geek by Nature, Linux by Choice

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Re: cpufreq frequencies off for Core 2 Duo E6600 "Conroe"

[Dominik Brodowski]

Hi,

On Tue, Oct 10, 2006 at 02:41:03AM +0200, Matthias Hentges wrote:
> I'm the happy user of a shiny new C2D E6600 CPU. While cpufreq works, it
> only offers support for the lowest possible frequency (1596MHz)

That's probably because the BIOS only exposes the lowest and the highest
frequency.

> There is another thing bugging me with cpufreq:
> +root@mhcln01:../system/cpu/cpu0/cpufreq >cat scaling_cur_freq 
> 1596000
> +root@mhcln01:../system/cpu/cpu0/cpufreq >cat cpuinfo_cur_freq 
> 1596000
> 
> Since the machine is overclocked to FSB301 (2.7GHz), the output above is
> clearly wrong (should read 6 x 301 = 1806MHz). I wonder if it would be
> possible to replace the output with the real frequency, not some
> hard-wired frequency/vcore value?

Not easily.

	Dominik