From owner-freebsd-amd64@FreeBSD.ORG Tue Jan 24 18:09:10 2006 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C36D616A41F for ; Tue, 24 Jan 2006 18:09:10 +0000 (GMT) (envelope-from lars.tunkrans@bredband.net) Received: from mxfep02.bredband.com (mxfep02.bredband.com [195.54.107.73]) by mx1.FreeBSD.org (Postfix) with ESMTP id CD5A743D58 for ; Tue, 24 Jan 2006 18:09:08 +0000 (GMT) (envelope-from lars.tunkrans@bredband.net) Received: from [192.168.245.40] ([213.112.167.229] [213.112.167.229]) by mxfep02.bredband.com with ESMTP id <20060124180907.DICV2008.mxfep02.bredband.com@[192.168.245.40]>; Tue, 24 Jan 2006 19:09:07 +0100 Message-ID: <43D66D52.2090008@bredband.net> Date: Tue, 24 Jan 2006 19:09:22 +0100 From: Lars Tunkrans User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.7.12) Gecko/20051118 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ken Gunderson References: <20060124110334.40e81208.kgunders@teamcool.net> In-Reply-To: <20060124110334.40e81208.kgunders@teamcool.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-amd64@freebsd.org Subject: Re: dual vs single core opteron 100's 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, 24 Jan 2006 18:09:10 -0000 Ken Gunderson wrote: >Greets Everyone: > >I was getting into a discussion the other day about this and decided to >see what the FBSD amd64 gurus had to say about it. Given approximately >equal cost of, for example, a single core Opteron150 (2.4GHz) and a >dual core Opteron165 (1.8GHz) under what kind of situations would >one be preferred over the other? > >fwiw- my friend asserts it will ALWAYS be the faster single core because >of context switches and dual cores are optimized for highly multi- >threaded OS's (e.g. WInblows). But 1) I think the scheduler has been >improved in 6.0, and 2) he's a linuxer. > >And yes, I know what AMD has to say on this but am interested in the >FBSD community's perspective on this w.r.t. FBSD. > >TIA > > > The DUAL core will be prefferd for Webservers, Application servers, and databases that are multithreaded and transaction oriented. The singel Core will be preffered for Simulations, Compute intensive stuff - image Rendering , Games , that are singel threaded. //Lars