From owner-freebsd-arch Wed May 31 11:30:43 2000 Delivered-To: freebsd-arch@freebsd.org Received: from ns.dotcast.net (ns.dotcast.com [63.77.78.58]) by hub.freebsd.org (Postfix) with ESMTP id 36B4737B548 for ; Wed, 31 May 2000 11:30:40 -0700 (PDT) (envelope-from marty@dotcast.com) Received: from joshuatree (joshuatree.dotcast.com [10.10.10.133]) by ns.dotcast.net (8.9.3/8.9.3) with SMTP id LAA80061 for ; Wed, 31 May 2000 11:30:19 -0700 (PDT) (envelope-from marty@dotcast.com) From: "Marty Fouts" To: Subject: RE: Preemptive kernel on older X86 hardware Date: Wed, 31 May 2000 11:29:32 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 In-Reply-To: <20000531172432.A7547@sophos.com> Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG It depends a great deal on how you want to use the NUMA system and what it's internal architecture supports. I spent a number of years at HP Labs investigating a similar proposition for a different Un*x, and the amount of work varies dramatically with the requirements. Loosely coupled "cluster" applications mostly require adding some shared namespace features, which is a lot of work. Tightly coupled highly available systems pretty much require a significant rewrite, or, lacking that, a collection of bubble gum and bailing wire sufficient to stretch from here to the moon and back. Marty -----Original Message----- From: owner-freebsd-arch@FreeBSD.ORG [mailto:owner-freebsd-arch@FreeBSD.ORG]On Behalf Of Mark Blackman Sent: Wednesday, May 31, 2000 9:25 AM To: Chuck Paterson Cc: Luoqi Chen; arch@FreeBSD.ORG Subject: Re: Preemptive kernel on older X86 hardware On a nearly unrelated note, anybody care to venture how tough would it be to modify *BSD* to run on a NUMA system instead of an SMP solution. This, obviously, is very high-end tiny niche area, but interesting to contemplate, especially if you're not doing the development. :) -- Mark Blackman,Internet Systems Administrator,Sophos Anti-Virus e-mail: tmb@sophos.com http://www.sophos.com US Support: +1 888 SOPHOS 9 UK Support: +44 1235 559933 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message