Messages in this thread | | | From | (Alan Cox) | Subject | Re: GRR!! SMP=1 sucks | Date | Thu, 9 Apr 1998 18:55:39 +0100 (BST) |
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> >SMP=1 isnt safe on some boxes. > Please tell me more about this.
It looks for the APIC and it may not exist. I don't know any box that poking around for an invisible APIC crashes _but_...
> >SMP=1 is upto 10% slower for single CPU > >on real tasks and 40% slower on certain FPU/sleep/FPU/sleep patterns > > Is this situation permanent or just a matter of some tuning > needing to be done (e.g, the granularity of some locks needing to be > adjusted)? I would hope, for example, that spin locks to do not > actually "spin" if there is only one CPU.
Permanent. The FPU lazy restore doesnt work SMP
Alan
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