From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751408AbWESRhc (ORCPT ); Fri, 19 May 2006 13:37:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751410AbWESRhc (ORCPT ); Fri, 19 May 2006 13:37:32 -0400 Received: from tallyho.bytemark.co.uk ([80.68.81.166]:2692 "EHLO tallyho.bytemark.co.uk") by vger.kernel.org with ESMTP id S1751408AbWESRhb (ORCPT ); Fri, 19 May 2006 13:37:31 -0400 Date: Fri, 19 May 2006 18:37:27 +0100 From: "Dr. David Alan Gilbert" To: linux-kernel@vger.kernel.org Cc: John Richard Moser Subject: Re: Stealing ur megahurts (no, really) Message-ID: <20060519173727.GA7947@gallifrey> References: <446D61EE.4010900@comcast.net> <20060519112218.GE19673@gallifrey> <446DFF25.4020301@comcast.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <446DFF25.4020301@comcast.net> X-Chocolate: 70 percent or better cocoa solids preferably X-Operating-System: Linux/2.4.32 (i686) X-Uptime: 18:30:59 up 10 days, 6:43, 1 user, load average: 0.30, 0.20, 0.10 User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * John Richard Moser (nigelenki@comcast.net) wrote: > That I wrote > > <...> > > > > Hi John, > > While cpu downclocking helps a bit, it would be hopelessly inaccurate > > for figuring out if your app would run fast enough on the given > > ancient machine. A lot else has happened to the world since the days > > of the 200MHz CPU: > > * Faster memory > > * Larger caches > > * Faster PCI busses > > * Instruction set additions (various more levels of SSE etc) > > * Faster discs > > * Changes to the CPU architecture/implementation > > > > Skews and fuzz. Imperfections, but at least we get a general idea. ;) Really? I bet there is a factor of 2 at least in that lot when you put them together? (Depending on what you are running) Remember the reason you are scrabbling around for this ancient machine is to answer a question along the lines of 'is my program useable on a .....' ? Also you want to make sure you haven't made an assumption about an actual feature (you left a cmov in somewhere? You assumed AGP? LBA block addressing etc). Dave -- -----Open up your eyes, open up your mind, open up your code ------- / Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \ \ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex / \ _________________________|_____ http://www.treblig.org |_______/