Re: SMP kernel on uniprocessor system?

Zachary Amsden (zamsden@cthulhu.engr.sgi.com)
Mon, 04 Oct 1999 10:39:27 -0700


>From: Chris Wedgwood <cw@f00f.org>

>> No advantages. Performance and memory waste disavantages.

>Has anyone actually quantified how much memory is wasted and how much
>slower things are? I would expect for most people, it would be
>imperceivable.

Well for one thing, I would expect your context switching and lock
primitives to have extra overhead, which would result in overall
performance degradation. Any extra bookeeping involved in SMP
increases the probability of cache misses.

Zachary Amsden
zamsden@engr.sgi.com

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