From owner-freebsd-questions Thu Sep 21 11:44:35 2000 Delivered-To: freebsd-questions@freebsd.org Received: from symbion.srrc.usda.gov (symbion.srrc.usda.gov [199.133.86.40]) by hub.freebsd.org (Postfix) with ESMTP id 9A64E37B423 for ; Thu, 21 Sep 2000 11:44:32 -0700 (PDT) Received: (from glenn@localhost) by symbion.srrc.usda.gov (8.11.0/8.11.0) id e8LIiPm92039; Thu, 21 Sep 2000 13:44:25 -0500 (CDT) (envelope-from glenn) From: Glenn Johnson Date: Thu, 21 Sep 2000 13:44:25 -0500 To: "S. David Pullara" Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Intel cpu's and the -march switch Message-ID: <20000921134425.A91788@node1.cluster.srrc.usda.gov> Mail-Followup-To: glenn, "S. David Pullara" , freebsd-questions@FreeBSD.ORG References: <14794.8801.494001.718949@yuggoth.warpedspace.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <14794.8801.494001.718949@yuggoth.warpedspace.org>; from sdpullara@telus.net on Thu, Sep 21, 2000 at 07:59:45AM -0700 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Sep 21, 2000 at 07:59:45AM -0700, S. David Pullara wrote: > Can anyone tell me if compiling with gcc's -march and -mcpu options > will make any difference? I have an AMD K6 (586-class) cpu and I have > no idea if recompiling the kernel (and other apps) with those switches > is going to result in any improvement. Does anyone know? You will not notice any perceptible performance improvement but you may notice your kernel and/or programs acting strangely after compiling with those options. I would recommend that you _not_ bother with the -march or -mcpu options. -- Glenn Johnson USDA, ARS, SRRC Phone: (504) 286-4252 New Orleans, LA 70124 e-mail: gjohnson@nola.srrc.usda.gov To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message