Date: Thu, 02 Sep 1999 10:40:30 -0700 From: Nick Sayer <nsayer@sftw.com> To: freebsd-hackers@freebsd.org Subject: CFD: "bogomips" CPU performance metric Message-ID: <37CEB68D.848BDAF8@sftw.com>
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[-- Attachment #1 --]
Linux generates a meric of CPU performance as a byproduct of calibrating
a delay loop.
We don't require doing any such thing, and so adding it would be purely
cosmetic.
However, I allege that cosmetic things aren't in and of themselves evil,
so long as
they don't break anything in the process.
I would like to generate a number that will hopefully be reasonably
compatible with
the one Linux spits out. The best method I have come up with is to have
a similar
(the same?) count down loop in assembler. Have it count down from
1,000,000 and
see how much nanotime() has gone by. NANSPERSEC/nansused = bogomips.
A 1 bogomips machine will take an extra second to do this (anything
likely to be
even able to run FreeBSD should exceed 1 BM - yes, ha ha), and a kBM CPU
can do it in 1 ms. Perhaps in the future a prescaler might be required,
but
this whole thing is just really chrome anyway.
Would anyone scream and projectile-vomit if I added this to identcpu.c?
[-- Attachment #2 --]
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