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3 frequency steps for p3 on windows

QUESTION Simon Braunschmidt 1 participant 3 messages May 12, 2005 – Jun 27, 2005

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Simon Braunschmidt

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#0 lore raw

Hi,

I have a compaq armada m300 with a speedstep-enabled 600mhz pentium. It is running ubuntu so its essentialy a 2.6.10 kernel. Scaling the frequency dynamically works very good so far, i can choose between ~500mhz and ~600mhz.

However, when i boot into windows xp sp2, after installing some enabler programm from the compaq website, the freqency of the cpu is scaled dynamically with the THREE steps ~413mhz, ~500mhz and ~600mhz, the exact values for 500 and 600 being the same as in linux.

So in windows i get an extra frequency option for 413mhz not available in linux.

Is there any chance of supporting this in linux? Since i only ever heard of 2 frequency steps for the early p3's, i think this will be a compaq-specific behaviour. Is compaq giving out documentation?

please cc me

Greetings
Simon Braunschmidt

simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ uname -a
Linux heimdal 2.6.10-5-686 #1 Tue Apr 5 12:27:02 UTC 2005 i686 GNU/Linux
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 3
cpu MHz         : 498.115
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 sep mtrr pge mca cmov pat 
pse36 mmx fxsr sse
bogomips        : 986.45
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ sudo cat *
Password:
0
500000
600000
500000
600000 500000
userspace ondemand powersave performance
500000
speedstep-smi
userspace
600000
500000
500000
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$
author
#1 lore raw

Am Donnerstag, 12. Mai 2005 22:53 schrieb Simon Braunschmidt:

Quoted 15 lines

Hi,

I have a compaq armada m300 with a speedstep-enabled 600mhz pentium. It is running ubuntu so its essentialy a 2.6.10 kernel. Scaling the frequency dynamically works very good so far, i can choose between ~500mhz and ~600mhz.

However, when i boot into windows xp sp2, after installing some enabler programm from the compaq website, the freqency of the cpu is scaled dynamically with the THREE steps ~413mhz, ~500mhz and ~600mhz, the exact values for 500 and 600 being the same as in linux.

So in windows i get an extra frequency option for 413mhz not available in linux.

Quoted 9 lines

Is there any chance of supporting this in linux? Since i only ever heard of 2 frequency steps for the early p3's, i think this will be a compaq-specific behaviour. Is compaq giving out documentation?

please cc me

Greetings
Simon Braunschmidt

After some (random) experimentation (changing from ac to battery while in s3 state, maybe something more, didnt take notes, seems all unrelated), the frequency steping in linux was ~415mhz and ~500mhz. The values
in /sys­­/.../cpufreq stayed the same, and the max. frequency was now ~500mhz (the 600mhz diddnt seem to work anymore).

This behaviour was gone after a reboot and i hadnt been able to reproduce it, strange.

So in principle it is possible under linux to use the "compaq 3 steps behaviour", but the inner workings need to be understood. Any pointers where i could start?

Greetings
Simon Braunschmidt

Quoted 40 lines
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ uname -a
Linux heimdal 2.6.10-5-686 #1 Tue Apr 5 12:27:02 UTC 2005 i686 GNU/Linux
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 3
cpu MHz         : 498.115
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 sep mtrr pge mca cmov
pat pse36 mmx fxsr sse
bogomips        : 986.45
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ sudo cat *
Password:
0
500000
600000
500000
600000 500000
userspace ondemand powersave performance
500000
speedstep-smi
userspace
600000
500000
500000
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$
author
#2 lore raw

Hi again

Any ideas about this?

At least some pointer about where to start investigating would be usefull, so i could start a the right place. Maybe you know off some tool to investigate the system state state in winxp for comparison with linux?

Greeting
Simon

Am Dienstag, 17. Mai 2005 17:11 schrieb Simon Braunschmidt:

Quoted 80 lines

Am Donnerstag, 12. Mai 2005 22:53 schrieb Simon Braunschmidt:

Quoted 15 lines

Hi,

I have a compaq armada m300 with a speedstep-enabled 600mhz pentium. It is running ubuntu so its essentialy a 2.6.10 kernel. Scaling the frequency dynamically works very good so far, i can choose between ~500mhz and ~600mhz.

However, when i boot into windows xp sp2, after installing some enabler programm from the compaq website, the freqency of the cpu is scaled dynamically with the THREE steps ~413mhz, ~500mhz and ~600mhz, the exact values for 500 and 600 being the same as in linux.

So in windows i get an extra frequency option for 413mhz not available in linux.

Quoted 8 lines

Is there any chance of supporting this in linux? Since i only ever heard of 2 frequency steps for the early p3's, i think this will be a compaq-specific behaviour. Is compaq giving out documentation?

please cc me

Greetings
Simon Braunschmidt

After some (random) experimentation (changing from ac to battery while in s3 state, maybe something more, didnt take notes, seems all unrelated), the frequency steping in linux was ~415mhz and ~500mhz. The values in /sys­­/.../cpufreq stayed the same, and the max. frequency was now ~500mhz (the 600mhz diddnt seem to work anymore).

This behaviour was gone after a reboot and i hadnt been able to reproduce it, strange.

So in principle it is possible under linux to use the "compaq 3 steps behaviour", but the inner workings need to be understood. Any pointers where i could start?

Greetings
Simon Braunschmidt

Quoted 39 lines
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ uname -a
Linux heimdal 2.6.10-5-686 #1 Tue Apr 5 12:27:02 UTC 2005 i686 GNU/Linux
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 3
cpu MHz         : 498.115
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 sep mtrr pge mca
cmov pat pse36 mmx fxsr sse
bogomips        : 986.45
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$ sudo cat *
Password:
0
500000
600000
500000
600000 500000
userspace ondemand powersave performance
500000
speedstep-smi
userspace
600000
500000
500000
simon@heimdal:/sys/devices/system/cpu/cpu0/cpufreq$