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cpu not detected(x86)

DISCUSSION Nico Schottelius 3 participants 5 messages Aug 7, 2001 – Aug 21, 2001

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Nico Schottelius

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#0 lore raw

Hello!

I am trying to run 2.4.7 and have heavily problems with my cpu. The kernel retected another speed at every start! I attached three times CPUINFO. The cpu in reality is a p3 650 mhz speedstep. (may switch down to 500 mhz, but 126 _not_).

Who changed something in the 2.4.7 source ?
I am more or less unable to run X with netscape to write this email with 126 Mhz!

What to do, where to fix ? Please help asap!

Nico

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 161.858
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 : 330.95

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 127.553
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 : 244.94

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 162.371
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 : 317.84

#1 lore raw
Quoted 6 lines · Nico Schottelius

Hello!

I am trying to run 2.4.7 and have heavily problems with my cpu. The kernel retected another speed at every start! I attached three times CPUINFO. The cpu in reality is a p3 650 mhz speedstep. (may switch down to 500 mhz, but 126 _not_).

Speedstep is voodoo. No-one other than Intel have knowledge of how it works. On my P3-700 I've seen speeds range from as low as 2MHz[1] -> 266MHz (using an ACPI kernel), and the 550/700 on APM. I've also seen other laptops do speed scaling between 2MHz->full clock speed whilst on APM.

Run the MHz tester (URL below), and put the box under some load. It should increase the MHz accordingly. How high it goes seems to depend on how good your BIOS support for it is.

Also try switching between ACPI & APM kernels, to see what difference it makes.

regards,

Dave.

[1] Actually slower than this, the MHz calculation code takes some cycles, so it's an estimate only. http://www.codemonkey.org.uk/MHz.c

Signature · 2 lines
| Dave Jones.        http://www.suse.de/~davej
| SuSE Labs
author
#2 lore raw

Re: cpu not detected(x86) (ACPI!)

In reply to Nico Schottelius

It's me again. Running without ACPI seems to
fix the problem. Possibly this bugs comes from
acpi.

Can someone check that ?

Nico

Quoted 74 lines · Nico Schottelius

Hello!

I am trying to run 2.4.7 and have heavily problems with my cpu. The kernel retected another speed at every start! I attached three times CPUINFO. The cpu in reality is a p3 650 mhz speedstep. (may switch down to 500 mhz, but 126 _not_).

Who changed something in the 2.4.7 source ?
I am more or less unable to run X with netscape to write this email with 126 Mhz!

What to do, where to fix ? Please help asap!

Nico

------------------------------------------------------------------------
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 161.858
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 : 330.95

------------------------------------------------------------------------
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 127.553
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 : 244.94

------------------------------------------------------------------------
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 162.371
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 : 317.84

#3 lore raw
In reply to Nico Schottelius
Quoted 10 lines · Nico Schottelius

Hello!

I am trying to run 2.4.7 and have heavily problems with my cpu. The kernel retected another speed at every start! I attached three times CPUINFO. The cpu in reality is a p3 650 mhz speedstep. (may switch down to 500 mhz, but 126 _not_).

Who changed something in the 2.4.7 source ?
I am more or less unable to run X with netscape to write this email with 126 Mhz!

Sometimes i use an old Pentium 133 classic (no mmx), and it works, well to do this with X11 and netscape. I think we are starting to be used to PC that are too powerful. :) If you go to fast how can you see where you are going? ;)
OK, it was a joke...

I would like to know, if your CPU is on a laptop, are you sure that your power management works well?

Is it working ok with 2.4.6? and 2.4.8-pre3?

Luigi

author
#4 lore raw
Quoted 12 lines · Luigi Genoni
Quoted 10 lines · Nico Schottelius

Hello!

I am trying to run 2.4.7 and have heavily problems with my cpu. The kernel retected another speed at every start! I attached three times CPUINFO. The cpu in reality is a p3 650 mhz speedstep. (may switch down to 500 mhz, but 126 _not_).

Who changed something in the 2.4.7 source ?
I am more or less unable to run X with netscape to write this email with 126 Mhz!

Quoted 8 lines

Sometimes i use an old Pentium 133 classic (no mmx), and it works, well to do this with X11 and netscape. I think we are starting to be used to PC that are too powerful. :) If you go to fast how can you see where you are going? ;)
OK, it was a joke...

I would like to know, if your CPU is on a laptop, are you sure that your power management works well?

No, seems like ACPI killed the cpu speed.
I can't undernstand why ACPI is not marked EXPERIMENTAL, if those things are normal!

Quoted 1 line

Is it working ok with 2.4.6? and 2.4.8-pre3?

Sorry, only tested 2.4.7.
Maybe I can test 2.4.8 in the next days.

Nico