Bogus BogoMIPS on ThinkPad? [Entertainment for Linus]

Bogus BogoMIPS on ThinkPad? [Entertainment for Linus]

[Patrick E Kane]

When my ThinkPad 600E boots Linux says that it has a 75 MHz CPU,
but my BIOS tells me it has a 300 MHz CPU -- whats the deal?

  Linux version 2.4.9-13 (bhcompile@stripples.devel.redhat.com)
    (gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)) #1
    Tue Oct 30 20:11:04 EST 2001
 ...
 Initializing CPU#0
 Detected 75.431 MHz processor.
 Console: colour VGA+ 80x25
 Calibrating delay loop... 169.98 BogoMIPS
 ...

My guess is that the TP is doing me a favour by running the
CPU at a reduced speed to save my battery.  I'm running 
with my charge plugged in so I'd like to have my BogoMIPS back.


The BogoMIPS HOWTO says:

  The reasons (there are two) it is printed during boot-up is that 
   a) it is slightly useful for debugging and for checking that the
      computers caches and turbo button work, and 
   b) Linus loves to chuckle when he sees confused people on the news.

Confused,

PEK
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Re: Bogus BogoMIPS on ThinkPad? [Entertainment for Linus]

[Dave Jones]

On Mon, 3 Dec 2001, Patrick E Kane wrote:

> When my ThinkPad 600E boots Linux says that it has a 75 MHz CPU,
> but my BIOS tells me it has a 300 MHz CPU -- whats the deal?

Try tpctl. (http://tpctl.sourceforge.net/)
Seems to have a 'SPeed' setting option.

(This is probably controllable from your BIOS too somewhere)

regards,
Dave.

-- 
| Dave Jones.        http://www.codemonkey.org.uk
| SuSE Labs

Re: Bogus BogoMIPS on ThinkPad? [Entertainment for Linus]

[Patrick E Kane]

Dave,

Thanks for the pointer to tpctl (ThinkPad configuration tools for Linux).
It allowed me to change the default speed so I get 300 MHz at boot.

 || When my ThinkPad 600E boots Linux says that it has a 75 MHz CPU,
 || but my BIOS tells me it has a 300 MHz CPU -- whats the deal?
 | Try tpctl. (http://tpctl.sourceforge.net/)

Using tpctl I was able to figure out that the key sequene FN+F11 can 
be used to toggle power mode (the F11 key has faucet icon :-).

With my CPU at full speed a couple of other problems that I was having
have gone away.  I was having problems with keyboard focus when I 
switch X term windows and sometime X clients would get broken pipe
errors when starting up.

Thanks,

PEK
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