Date: Wed, 17 Jan 2001 01:51:45 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: andy@chantrill.freeserve.co.uk (Andy Chantrill) Cc: freebsd-smp@FreeBSD.ORG Subject: Re: APIC Message-ID: <200101170151.SAA20200@usr08.primenet.com> In-Reply-To: <000f01c08003$562b4f30$01010a0a@DEDICATIONINET.local> from "Andy Chantrill" at Jan 16, 2001 09:28:57 PM
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> Hey, > > A few questions about smp (I'm new to this gig): > > i) What is APIC? Advanced Programmable Interrupt Controller. Your processor has one, for each processor you have, and your I/O chipset has at least one. For more information, you should probably look at the Intel Multiprocessing specification, version 1.4 or better. It's basically Intel's way of getting a patent and externalizing the SMP interprocessor arbitration logic, so tho no clone vendors can create SMP systems which are compatible, without licensing the patent. That's why all the clone vendors got together and created "OpenAPIC". > ii) What is the difference between "APIC" and "APIC -mapped" in > my Compaq Proliant BIOS? You would have to ask Compaq, to be absolutely sure.; it could mean anything, really. > iii) Which should I be using? In general terms, whatever it says you should use for UnixWare is usually conservative enough to work with BSD, which likes to cut things pretty close to the glass (that is, BSD has some pretty high expectations of the hardware having been built to specification correctly). My suggestion would be "leave it alone, unless it doesn't work, in which case, use whatever works, and post about it to this list, so it will be saved in the archives for the next person". Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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