From owner-freebsd-amd64@FreeBSD.ORG Thu Jul 28 16:23:36 2005 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 AD96116A41F for ; Thu, 28 Jul 2005 16:23:36 +0000 (GMT) (envelope-from ray@redshift.com) Received: from outgoing.redshift.com (outgoing.redshift.com [207.177.231.8]) by mx1.FreeBSD.org (Postfix) with ESMTP id 661BD43D45 for ; Thu, 28 Jul 2005 16:23:36 +0000 (GMT) (envelope-from ray@redshift.com) Received: from workstation (216-228-19-21.dsl.redshift.com [216.228.19.21]) by outgoing.redshift.com (Postfix) with SMTP id 2B83597915; Thu, 28 Jul 2005 09:23:36 -0700 (PDT) Message-Id: <3.0.1.32.20050728092338.01207628@pop.redshift.com> X-Mailer: na X-Sender: redshift.com Date: Thu, 28 Jul 2005 09:23:38 -0700 To: Steve Kargl From: ray@redshift.com In-Reply-To: <20050728161908.GB64153@troutmask.apl.washington.edu> References: <3.0.1.32.20050728080526.00aa4098@pop.redshift.com> <86mzo7yvpe.fsf@xps.des.no> <3.0.1.32.20050728013152.00a4d188@pop.redshift.com> <86mzo7yvpe.fsf@xps.des.no> <3.0.1.32.20050728080526.00aa4098@pop.redshift.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: freebsd-amd64@freebsd.org Subject: Re: Benchmarks: AMD64 vs i386 on Dual 246 Opteron 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: Thu, 28 Jul 2005 16:23:36 -0000 True, once you go over the 4GB limit it's a different ball of wax. However, until that time, it would be nice to get to the bottom of why 64 bit code is running half the speed of 32 bit code on the exact same machine - don't you think? Ray At 09:19 AM 7/28/2005 -0700, Steve Kargl wrote: | On Thu, Jul 28, 2005 at 08:05:26AM -0700, ray@redshift.com wrote: | > | > I've also heard the AMD's perform well under heavy database | > load - although I have not put any machine into production yet. | > | > As you say, you get a new shinney AMD and run to put a 64 bit | > OS on it thinking it will smoke the tires. But once you test | > it and start thinking about it, the 32 bit running faster makes | > sense. Maybe there needs to be a 20 bit OS :-) | > | | Drop 8 GB of memory into the box and see how the 32-bit | FreeBSD performs in comparison to the 64-bit FreeBSD | when your process consumes greater than 4GB of memory. | | -- | Steve | |