Re: GRR!! SMP=1 sucks

Adrian Bridgett (linker@nightshade.ml.org)
Thu, 9 Apr 1998 18:39:31 -0400 (EDT)


On Thu, 9 Apr 1998, Alan Cox wrote:

> > I think that SMP=1 should be the default because eventually
> > we may want SMP=1 to be the only kind of kernel so that we can have
> > fully preemptable kernel threads, which in turn will allow every
>
> SMP=1 isnt safe on some boxes. SMP=1 is upto 10% slower for single CPU
> on real tasks and 40% slower on certain FPU/sleep/FPU/sleep patterns
>
> Alan

Then perhaps this is some more pressure to reduce SMP overhead to it's
bare minimum?

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