Date: Thu, 04 Jul 1996 11:44:12 -0700 From: erich@uruk.org To: freebsd-smp@freebsd.org Subject: Running SMP Message-ID: <199607041844.LAA11426@uruk.org>
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After hacking the hard-coded base address of the APIC, I tried running
some kernel compiles to see what kind of performance I was getting.
Frankly, it was pretty rotten. Here's what I got (multiprocessor
150MHz Pentium Pro w/256K caches):
FreeBSD SMP 1 CPU : 4:36
-j 2 : 4:15
FreeBSD SMP 2 CPU : 4:28
-j 2 : 4:28
This was all compiling the SMP kernel with almost no devices. I almost
couldn't tell the other CPU was activated, except that "sysctl" told
me in big bold letters that it was, and I kept getting kernel error
messages about "calcru: negative time: ..." and such after doing it.
Linux-SMP would give me at least a 1.5x speedup with a full kernel spinlock
and badly parallelized makefile. What's the deal here?
--
Erich Stefan Boleyn \_ E-mail (preferred): <erich@uruk.org>
Mad Genius wanna-be, CyberMuffin \__ (finger me for other stats)
Web: http://www.uruk.org/~erich/ Motto: "I'll live forever or die trying"
This is my home system, so I'm speaking only for myself, not for Intel.
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