From owner-freebsd-smp Thu Sep 12 11:25:53 1996 Return-Path: owner-smp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id LAA20943 for smp-outgoing; Thu, 12 Sep 1996 11:25:53 -0700 (PDT) Received: from clem.systemsix.com (clem.systemsix.com [198.99.86.131]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id LAA20931 for ; Thu, 12 Sep 1996 11:25:48 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by clem.systemsix.com (8.6.12/8.6.12) with SMTP id MAA18695; Thu, 12 Sep 1996 12:23:59 -0600 Message-Id: <199609121823.MAA18695@clem.systemsix.com> X-Authentication-Warning: clem.systemsix.com: Host localhost didn't use HELO protocol X-Mailer: exmh version 1.6.5 12/11/95 From: Steve Passe To: Terry Lambert cc: peter@spinner.dialix.com (Peter Wemm), rv@groa.uct.ac.za, freebsd-smp@FreeBSD.org Subject: Re: Intel XXpress - some SMP benchmarks In-reply-to: Your message of "Thu, 12 Sep 1996 11:07:22 PDT." <199609121807.LAA07176@phaeton.artisoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 12 Sep 1996 12:23:59 -0600 Sender: owner-smp@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk Hi, >> One thing I'm not clear about from the IO apic docs yet is whether there >> are 15 cpu's and 15 IO apic's, or whether there's a limit of 15 devices on >> the APIC bus. > > 1 BP, 31 (AP | IO APIC) (2^5 == 32) its a four bit register, where do you get 2^5, am I missing something? > You may want to disassemble your MP cold boot BIOS code to see about I've been wondering about the issue of the MP table being in BIOS. Traditionally this is ROM. Do you think they just hardcode all this stuff, or really arbitrate numbers during boot and can 'modify' them in the BIOS area because it is really shadowed into RAM? -- Steve Passe | powered by smp@csn.net | FreeBSD -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.2 mQCNAzHe7tEAAAEEAM274wAEEdP+grIrV6UtBt54FB5ufifFRA5ujzflrvlF8aoE 04it5BsUPFi3jJLfvOQeydbegexspPXL6kUejYt2OeptHuroIVW5+y2M2naTwqtX WVGeBP6s2q/fPPAS+g+sNZCpVBTbuinKa/C4Q6HJ++M9AyzIq5EuvO0a8Rr9AAUR tBlTdGV2ZSBQYXNzZSA8c21wQGNzbi5uZXQ+ =ds99 -----END PGP PUBLIC KEY BLOCK-----