Wrong CPU speed shown in /proc/cpuinfo

insomniac

I have a Thinkpad (IBM T20) with a 650 MHz P-III cpu. But:

bash-2.05a# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 3
cpu MHz : 135.516
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 : 286.72

So.... what's wrong???
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mksoft · l33t Joined: 28 May 2002 Posts: 844

Maybe your cpu is set for lower speed to conserve power :?:

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drone · n00b Joined: 12 Oct 2002 Posts: 2

And see if you can set some powersaving options there.
My Thinkpad 240 has this set of options... And then there is the Fn+Key keyboard commands to set the cpu to full power / low power / floating power consumption. But I find them key presses confusing, so I just set it to full power in the BIOS.

Try that and see what you get.

insomniac · Posted: Sun Oct 13, 2002 2:49 pm Post subject:

hmm... got the following now:

sh-2.05a$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 3
cpu MHz : 497.842
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 : 992.87

...which is a bit better, but still not 650 MHz...

I am using the gentoo-sources kernel. The Thinkpad modules are not loaded.
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oniq · Guru Joined: 02 Sep 2002 Posts: 597 Location: Connecticut

Do you have CPU Frequency scaling turned on in the kernel under Processor type and features?
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insomniac · Posted: Sun Oct 13, 2002 5:38 pm Post subject:

eh - i have no such option there...
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oniq · Guru Joined: 02 Sep 2002 Posts: 597 Location: Connecticut

How about when you boot, what is your CPU speed? (dmesg | grep speed)

insomniac · Posted: Sun Oct 13, 2002 6:22 pm Post subject:

here:

sh-2.05a$ dmesg | grep MHz
Detected 497.842 MHz processor.
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
sh-2.05a$

hmm... seems like something is not right.

what about the "jiffies" setting in the kernel config? it's set to 100... (what does it do, anyway???)
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oniq · Guru Joined: 02 Sep 2002 Posts: 597 Location: Connecticut

Since it seems to boot at a lower speed, its got to either think its on battery power or its a BIOS setting. Which kernel are you exactly using (from uname -r)? Why not give a different kernel a try, making sure scaling is off?

Try checking out http://mr.uue.org/gnulinux/t20/#speedstep.
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insomniac · Posted: Mon Oct 14, 2002 2:51 pm Post subject:

i'm using gentoo-sources 2.4.19
will check more when i get home
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insomniac · Posted: Mon Oct 14, 2002 5:28 pm Post subject:

bash-2.05a# uname -r
2.4.19-gentoo-r9
bash-2.05a#

And I _still_ do not have a "scaling" setting anywhere in the kernel options...
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ee99ee2 · Posted: Fri Apr 18, 2003 8:33 pm Post subject:

me either
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dberkholz · Posted: Fri Apr 18, 2003 9:42 pm Post subject:

I've only seen CPU Frequency Scaling in 2.5.x kernels, not 2.4.x.

gubbs · n00b Joined: 28 Feb 2003 Posts: 35

did you resolve this?

I just ordered a t20 ... :Os