From owner-freebsd-amd64@FreeBSD.ORG Tue Dec 26 20:09:10 2006 Return-Path: X-Original-To: amd64@freebsd.org Delivered-To: freebsd-amd64@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id B721D16A403 for ; Tue, 26 Dec 2006 20:09:10 +0000 (UTC) (envelope-from tamaru@myn.rcast.u-tokyo.ac.jp) Received: from mail1.ecc.u-tokyo.ac.jp (mail1.ecc.u-tokyo.ac.jp [133.11.50.203]) by mx1.freebsd.org (Postfix) with ESMTP id 67DB113C480 for ; Tue, 26 Dec 2006 20:09:10 +0000 (UTC) (envelope-from tamaru@myn.rcast.u-tokyo.ac.jp) Received: from spam004.ecc.u-tokyo.ac.jp (spam004.ecc.u-tokyo.ac.jp [133.11.50.197]) by mail1.ecc.u-tokyo.ac.jp (Postfix) with ESMTP id B371F1006A for ; Wed, 27 Dec 2006 05:09:09 +0900 (JST) Received: from md002.ecc.u-tokyo.ac.jp (192.168.160.22 [192.168.160.22]) by spam004.ecc.u-tokyo.ac.jp (SpamBlock.pst 3.4.94) with ESMTP id for ; Wed, 27 Dec 2006 05:08:23 +0900 Received: from amulet.amuletic.net (v055252.ppp.asahi-net.or.jp [124.155.55.252]) by md002.ecc.u-tokyo.ac.jp (MOS 3.4.5-GR) with ESMTP id BOY07717 (AUTH via LOGINBEFORESMTP); Wed, 27 Dec 2006 05:08:23 +0900 (JST) Date: Wed, 27 Dec 2006 05:08:36 +0900 Message-ID: From: Hiroharu Tamaru To: amd64@FreeBSD.org In-Reply-To: <20061226104440.5d52417b.kgunders@teamcool.net> References: <20061226104440.5d52417b.kgunders@teamcool.net> User-Agent: User-Agent: Wanderlust/2.14.0 (Africa) Emacs/21.3 Mule/5.0 (SAKAKI) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII X-IP: 192.168.160.22 X-FROM-DOMAIN: myn.rcast.u-tokyo.ac.jp X-FROM-EMAIL: tamaru@myn.rcast.u-tokyo.ac.jp Cc: Subject: Re: >32GB memory with Xeon ? X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Dec 2006 20:09:10 -0000 At Tue, 26 Dec 2006 10:44:40 -0700, Ken Gunderson wrote: > > On Tue, 26 Dec 2006 23:07:58 +0900 > Hiroharu Tamaru wrote: > > > Hello list, > > > > Is there any limit on the amount of memory that can be used > > with FreeBSD 6.x/amd64 ? I found that FreeBSD/ia64 > > currently has 2GB limit. I was wondering how amd64 is like. > > > > Specifically, I am thinking of a Dual-core x Dual-processor > > Xeon 5160, with 5000P chipset and something like 40GB of > > RAM. > > Any particular reason you've ruled out AMD platform? I know some folks > who've done some big enterprise class SAP machines based on AMD and > Linux. Not 100% sure but I think I recall AMD8111 and AMD8131 chipsets > and boards fully loaded with 32GB. No, I haven't ruled it out yet. In fact, I've just started looking around. My usage is computation, and previous experiences showed that for our workload, the main memory bandwidth gave the largest influence on speed (it has a very low data locality). We have IA64 system running Linux as well (it's running Linux b/c we have large memory there too), but hearing that recent Woodcrest Xeons can have upto 21+GB/s bandwidth to the RAM, I got interested and started seeking around hardwarewise and softwarewise for possible options. Do you have any advice/comments in this regard for AMD platform too? > -- > > Best regards, > > Ken Gunderson > > "The course of history shows that as a government grows, liberty > decreases." (Thomas Jefferson) Thanks. -- Hiroharu Tamaru