On 09-Mar-2004 Jon Noack wrote: > On 3/9/2004 10:17 AM, Justin Dossey wrote: >> On Tue, 9 Mar 2004, Conrad Sabatier wrote: >>>I've been meaning to ask about this. Is there anything to be gained on a UP >>>box by enabling APIC and/or SMP? >> >> I'd say yes, there is. APIC reduces interrupt overhead and provides >> an on-chip timer. It also provides better interrupt sharing. > > APIC, yes (see above). SMP incurs a fairly significant amount of > overhead (extra locking, etc.). I think I heard something a while back > about attempts to selectively enable SMP locking at runtime (so that > leaving SMP enabled in GENERIC doesn't hurt so much for UP), but then > again that might have been a dream... ;-) > > In any case, this is what I run on my UP boxes: >#options SMP # Symmetric MultiProcessor Kernel > device apic # I/O APIC Interesting. Thanks! -- Conrad Sabatier <conrads_at_cox.net> - "In Unix veritas"Received on Tue Mar 09 2004 - 16:20:40 UTC
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