linux-kernel - Re: cpuinfo shows wrong MHz value

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Date:	Sun, 15 Feb 2009 08:11:35 +0100
From:	Joerg Platte <jplatte@...sa.net>
To:	Frans Pop <elendil@...net.nl>
Cc:	Kasper Sandberg <lkml@...anurb.dk>, linux-kernel@...r.kernel.org
Subject: Re: cpuinfo shows wrong MHz value

Am Sonntag, 15. Februar 2009 schrieb Joerg Platte:
> Am Sonntag, 15. Februar 2009 schrieb Frans Pop:
> > On Sunday 15 February 2009, Joerg Platte wrote:
> > > Sorry, I should have made it clear that my computer is running with 13
> > > GHz (at leat according to the kernel). With previous kernels (IIRC
> /sys/devices/system/cpu/cpu0/cpufreq> grep . *
> affected_cpus:0
> cpuinfo_cur_freq:13000000
> cpuinfo_max_freq:13000000
> cpuinfo_min_freq:3250000
> related_cpus:0
> scaling_available_frequencies:3250000 4875000 6500000 8125000 9750000
> 11375000 13000000
> scaling_available_governors:conservative ondemand userspace powersave
> performance
> scaling_cur_freq:13000000
> scaling_driver:p4-clockmod
> scaling_governor:performance
> scaling_max_freq:13000000
> scaling_min_freq:3250000
> scaling_setspeed:<unsupported>

Looks like p4_clockmod is responsible for these high values. After removing 
it /proc/cpuinfo shows the correct values:

cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 1
model name      : Intel(R) Pentium(R) 4 CPU 1.60GHz
stepping        : 2
cpu MHz         : 1598.609
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : 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 pebs bts
bogomips        : 3197.21
clflush size    : 64
power management:

best regards,
Jörg
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