From owner-freebsd-questions@FreeBSD.ORG Sun Aug 27 20:03:25 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E985816A4DA for ; Sun, 27 Aug 2006 20:03:25 +0000 (UTC) (envelope-from wojtek@tensor.3miasto.net) Received: from chylonia.3miasto.net (chylonia.3miasto.net [213.192.74.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id E272143D46 for ; Sun, 27 Aug 2006 20:03:23 +0000 (GMT) (envelope-from wojtek@tensor.3miasto.net) Received: from chylonia.3miasto.net (localhost [127.0.0.1]) by chylonia.3miasto.net (8.13.4/8.13.4) with ESMTP id k7RK3FXA020193; Sun, 27 Aug 2006 22:03:15 +0200 (CEST) (envelope-from wojtek@tensor.3miasto.net) Received: from localhost (wojtek@localhost) by chylonia.3miasto.net (8.13.4/8.13.4/Submit) with ESMTP id k7RK3EpY020190; Sun, 27 Aug 2006 22:03:14 +0200 (CEST) (envelope-from wojtek@tensor.3miasto.net) X-Authentication-Warning: chylonia.3miasto.net: wojtek owned process doing -bs Date: Sun, 27 Aug 2006 22:03:13 +0200 (CEST) From: Wojciech Puchar X-X-Sender: wojtek@chylonia.3miasto.net To: ke han In-Reply-To: Message-ID: <20060827220002.C19869@chylonia.3miasto.net> References: <44EF0F92.80108@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Martin Miedema , freebsd-questions@freebsd.org Subject: Re: Intel 64bit / AMD 64 bit advantage X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 27 Aug 2006 20:03:26 -0000 > 32 vs 64 bits does not give you any raw performance boost for most apps. The yes it will. FreeBSD/amd64 works at least 10% faster than FreeBSD/i386 on athlon64 machine, when i386 version were recompiled for P4. With default FreeBSD/i386 - it will be at least 30%. just because it's not just 64-bit addresses, but twice the registers (r8-r15) allowing C compiler to generate more efficient code. For now AMD64 is the fastest and cheapest architecture - at least with AMD processors, not intel clones. (YES now intel makes clones of AMD processors)