Date: Wed, 17 Jan 2001 15:31:36 +1100 From: "Christopher F. Moran" <cmoran@emergent.com.au> To: <freebsd-smp@FreeBSD.ORG>, "Terry Lambert" <tlambert@primenet.com>, "Andy Chantrill" <andy@chantrill.freeserve.co.uk> Subject: Re: APIC Message-ID: <008d01c0803e$76425440$4ba63c9d@southpacific.corp.microsoft.com> References: <200101170151.SAA20200@usr08.primenet.com>
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On my Proliant 1500 I had to use Mapped mode. The system was unstable (on 4.0 & 4.1) in "Full" Cheers, ----- Original Message ----- From: "Terry Lambert" <tlambert@primenet.com> To: "Andy Chantrill" <andy@chantrill.freeserve.co.uk> Cc: <freebsd-smp@FreeBSD.ORG> Sent: Wednesday, January 17, 2001 12:51 PM Subject: Re: APIC > > 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 > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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