[Cialug] MPS and APIC and ACPI

Dave Weis djweis at internetsolver.com
Thu Jun 30 19:20:38 CDT 2005

Going with APIC mode lets the motherboard move PCI cards and other 
devices to higher interrupts that 16, which helps latency on a full 
machine because the interrupt handlers don't get stacked up for multiple 


Nathan C. Smith wrote:
> MPS and APIC and ACPI blah!  Alphabet soup and I'm confused.
> Are these systems mainly concerned with routing interrupts on multiprocessor
> systems or is there a reason to have them on a single processor machine?
> Perhaps a single processor machine with lots of card slots.  Am I missing
> out on anything if I disable it in the BIOS?
> I found this on the MS web site :
> "Note:The Advanced Configuration and Power Interface Specification, Revision
> 1.0b replaces the Multiprocessor Specification, Version 1.4."
> Anybody share some rules of thumb for configuring this setting and which
> ones Linux supports?
> http://www.acpi.info/spec.htm#spec
> Thanks.
> -Nate
> Nathan Smith  McKee, Voorhees & Sease, P.L.C.  515.288.3667  
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