From owner-freebsd-questions@FreeBSD.ORG Thu Jan 15 17:53:52 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B5AF110656E5 for ; Thu, 15 Jan 2009 17:53:52 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 6C1978FC14 for ; Thu, 15 Jan 2009 17:53:52 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1LNWPc-0001UK-W3 for freebsd-questions@freebsd.org; Thu, 15 Jan 2009 17:53:49 +0000 Received: from pool-141-156-171-233.esr.east.verizon.net ([141.156.171.233]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 15 Jan 2009 17:53:48 +0000 Received: from nightrecon by pool-141-156-171-233.esr.east.verizon.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 15 Jan 2009 17:53:48 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Michael Powell Followup-To: gmane.os.freebsd.questions Date: Thu, 15 Jan 2009 12:54:25 -0500 Lines: 18 Message-ID: References: <496E06D1.2070706@gmail.com> <20090114181522.GB4487@aurora.oekb.co.at> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: pool-141-156-171-233.esr.east.verizon.net Sender: news Subject: Re: kernel configuration X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: nightrecon@verizon.net List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Jan 2009 17:53:53 -0000 Chuck Swiger wrote: [snip] > > While it is true that you can comment out all but i686 and get a > working kernel, you will experience reduced performance. There are a > number of low-level assembly routines (cf sys/i386/i386/support.s such > as i586_bcopy) that are conditionalized off of I586_CPU only, even > though they provide an advantage on i686 platforms also. > Thank you very kindly for this info tidbit. In my ignorance I had routinely built my kernels with only I686_CPU. Since the few boxen I have are all downlevel every niche I can squeak out some performance is sought after. Thanks indeed! -Mike