linux-kernel - 2.6.25.x: Wrong CPU frequency (cpufreq table) with p4-clockmod

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Message-Id: <12C649C0-4BEF-41F1-B738-8C8CEF8AEBB8@it-loops.com>
Date:	Fri, 30 May 2008 15:44:55 +0200
From:	Guntsche Michael <mike@...loops.com>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.25.x: Wrong CPU frequency (cpufreq table) with p4-clockmod

Hi list,

I recently upgraded one of my servers from 2.6.24.2 to 2.6.25. This is  
more or less a basic fileserver that also does some compilations from  
time to time.

cat /proc/cpuinfo from 2.6.24.2:

processor : 0
vendor_id : GenuineIntel
cpu family  : 15
model   : 1
model name  : Intel(R) Pentium(R) 4 CPU 1.70GHz
stepping  : 2
cpu MHz   : 425.000
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  
sync_rdtsc
bogomips  : 3401.38
clflush size  : 64

scaling_available_frequencies (p4-clockmod): 425000 637500 850000  
1062500 1275000 1487500 1700000

Since the server is idling most of the time I enabled the ondemand  
governor and installed p4-clockmod. I read that this is not the best  
solution but acpi-cpufreq is not working for me.

Everything was good with 2.6.24. After switching to to 2.6.25 I have  
the following output.

cat /proc/cpuinfo from 2.6.25.4:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 1
model name	: Intel(R) Pentium(R) 4 CPU 1.70GHz
stepping	: 2
cpu MHz		: 3450.000
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	: 3402.06
clflush size	: 64

scaling_available_frequencies (p4-clockmod): 3450000 5175000 6900000  
8625000 10350000 12075000 13800000

The scaling is working but the frequencies are way of. Every value is  
multiplied by ~8.12.
I get the same result with 2.6.25 and 2.6.25.4.
I am not sure if this is only a display related problem, or if  
something more serious is causing this.

Please CC me on any replies since I am not subscribed to the list.

Kind regards,
Michael

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