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Re: SUMMARY: pentium optimized debian discussion

On Wed, Jul 29, 1998 at 09:32:20AM -0700, Stephen Zander wrote:
> >>>>> "Joey" == Joey Hess <joey@kitenet.net> writes:
> Waht, if any, difference do the MMX instructions make?  My IBM 760XL
> laptop (166MHz MMX) reports 330.96 bogo-mips & I've always presumed
> that MMX was responsible.  Does pegcs/egcs -mpentim support the MMX
> instructions yet?

Ha! What makes you think that BogoMIPS tell you anything about your
processor? From the BogoMIPS mini-HOWTO:
  >From Lars Wirzenius,' wirzeniu@kruuna.Helsinki.FI mail of 9 September
  1993, explaining Bogomips, with additional detailed information by Wim
  van Dorst:

       `MIPS is short for Millions of Instructions Per Second.  It
       is a measure for the computation speed of a program.  Like
       most such measures, it is more often abused than used prop­
       erly (it is very difficult to justly compare MIPS for dif­
       ferent kinds of computers).

       BogoMips are Linus's invention. The kernel (or was it a
       device driver?) needs a timing loop (the time is too short
       and/or needs to be too exact for a non-busy-loop method of
       waiting), which must be calibrated to the processor speed of
       the machine. Hence, the kernel measures at boot time how
       fast a certain kind of busy loop runs on a computer. "Bogo"
       comes from "bogus", i.e, something which is a fake. Hence,
       the BogoMips value gives some indication of the processor
       speed, but it is way too unscientific to be called anything
       but BogoMips.

       The reasons (there are two) it is printed during bootup 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.'


"Rhubarb is no Egyptian god."        Debian GNU/Linux        finger brinkmd@ 
Marcus Brinkmann                   http://www.debian.org    master.debian.org
Marcus.Brinkmann@ruhr-uni-bochum.de                        for public  PGP Key
http://homepage.ruhr-uni-bochum.de/Marcus.Brinkmann/       PGP Key ID 36E7CD09

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