Mailinglist Archive: opensuse-de (5973 mails)

[ubtj@xxxxxxxxxxxxxxxxxxx (Thomas Hertweck)]

Hallo,

On Mon, 30 Oct 2000, Thorsten Jens wrote:
> * Norbert Roth:
>
> >  Ein Pentium I 100 MHz sollte 
> >  ca. 40 BogoMIPS ausweisen.
> >
> >  Hier wird beim Start 196 BogoMIPS gemeldet.
> >
> > Lt. Mini-HowTo kann eine falsche Konfiguration
> > dafür verantwortlich sein, aber wo? 
>
> IIRC wurde der Bogmips-Code irgendwann in den 2.2.x Kerneln
> geändert, so dass jetzt die Zahl doppelt so hoch ist.

Nein. Auszug aus BogoMIPS FAQ:

No, the BogoMips algorithm, contrarily to popular believe, did 
NOT change over the various kernel versions. What did change in
kernel version 2.2.13 is the CPU state setting just before the
BogoMips calculation. This affects the BogoMips rating for all 
Intel and AMD Pentium variations, resulting in approximately
2*clock, where these were not 2*clock.

Zum Problem des Pentium I 100 (eine Moeglichkeit... :-)

If a kernel is not compiled specifically for the pertaining CPU,
also some (even large) variations of the BogoMips ratings
can occur, mainly due to erroneous alignment. This problem
apparently only occurs on the various x86 CPUs (Intel and
clones). Fortunately it can easily be solved: recompile the kernel
specifically for your CPU.

Alles nachzulesen z.B. im neusten (21.10.00) BogoMIPS HowTo unter
http://www.hobby.nl/~clifton/bogomips.html.

Gruesse
Thomson


-- 
Dipl.-Geophys. Thomas Hertweck
Geophysikalisches Institut, Universitaet (TH) Karlsruhe
Email: ubtj@xxxxxxxxxxxxxxxxxxx
Linux is like a wigwam - no windows, no gates, apache inside! 

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