Messages in this thread | | | Date | Wed, 18 Mar 1998 21:23:06 +0100 | From | Pavel Machek <> | Subject | Re: SMP speed on 6x86 UP |
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Hi!
> > Anybody got any idea. May the APIC code touch chipset or processor > > ports? > > i suspect it's the LOCK overhead. If it's a single-CPU system, then could > you edit asm-i386/atomic.h, and do:
I doubt it could be _any_ kernel overhead. When machine goes down in performance 3 times or so, it usually means that something is misconfigured. Overhead in kernel does not hit user processes _that_ much and surely would not change bogomips.
> generally, the APIC(s) is rarely touched except at initialization > time. So
Well, one bad shot into configuration register at init time is probably just enough.
> it cant really be the APIC stuff. And it's _never_ supposed to be touched > if it's not detected at bootup ...
Pavel
-- I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).
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