From owner-freebsd-questions@FreeBSD.ORG Thu Mar 15 03:23:18 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id E487816A40D for ; Thu, 15 Mar 2007 03:23:18 +0000 (UTC) (envelope-from youshi10@u.washington.edu) Received: from mxout2.cac.washington.edu (mxout2.cac.washington.edu [140.142.33.4]) by mx1.freebsd.org (Postfix) with ESMTP id C655513C483 for ; Thu, 15 Mar 2007 03:23:18 +0000 (UTC) (envelope-from youshi10@u.washington.edu) Received: from hymn03.u.washington.edu (hymn03.u.washington.edu [140.142.12.169]) by mxout2.cac.washington.edu (8.13.7+UW06.06/8.13.7+UW07.03) with ESMTP id l2F3NIpV021264 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 14 Mar 2007 20:23:18 -0700 Received: from localhost (localhost [127.0.0.1]) by hymn03.u.washington.edu (8.13.7+UW06.06/8.13.7+UW07.03) with ESMTP id l2F3NIIC016980 for ; Wed, 14 Mar 2007 20:23:18 -0700 X-Auth-Received: from [67.187.172.183] by hymn03.u.washington.edu via HTTP; Wed, 14 Mar 2007 20:23:18 PDT Date: Wed, 14 Mar 2007 20:23:18 -0700 (PDT) From: youshi10@u.washington.edu To: freebsd-questions@freebsd.org In-Reply-To: <200703150321.18033.danny@ricin.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-PMX-Version: 5.3.0.289146, Antispam-Engine: 2.5.0.283055, Antispam-Data: 2007.3.14.200935 X-Uwash-Spam: Gauge=IIIIIII, Probability=7%, Report='SUPERLONG_LINE 0.05, NO_REAL_NAME 0, __CT 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0' Subject: Re: Optimizationn questions? 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: Thu, 15 Mar 2007 03:23:19 -0000 On Thu, 15 Mar 2007, Danny Pansters wrote: > On Thursday 15 March 2007 02:16, Gary Kline wrote: >> Two quick one for kernel and/or compiler wizards: first, is >> a 400Mz processor considered a 586 (for my KERNELCONF file)? > > Think its 686 (but really, leaving 486 and 586 in isn't going to slow down > booting or anything!) I always say: Use GENERIC unless you have a good reason > not to. > >> Second, is it safe to do a buildworld with -O3? If there are > > No. It's not supported if things break. > >> stability concerns, I'll go with the default when I rebuild my >> 6.2 systems. > > The defaults should be fine. Also, like I said consider just using GENERIC and > load the odd kmod if needed. Generally it's less headache and equal > performance. > >> thanks in advance, >> >> gary > > Cheers, > > Dan Dan, I know that this has been discussed a few times before, but IMO running a slightly stripped down kernel (i.e. custom, not GENERIC) actually proves to be helpful in increasing boot times (if options were added statically) and compile times if [(# of options added) < (# of options in GENERIC)]. I like being able to compile my kernel on my P4 in less than 10 minutes anyhow with less options :). The only thing that was brought up earlier (sometime later last year in a thread--I think either Oct or Nov) is that removing options removes flexibility as well. But that's a tradeoff you have to make. -Garrett