From owner-freebsd-isp Sat Mar 27 8:16:10 1999 Delivered-To: freebsd-isp@freebsd.org Received: from david.siemens.de (david.siemens.de [192.35.17.14]) by hub.freebsd.org (Postfix) with ESMTP id 2B4DD1528F for ; Sat, 27 Mar 1999 08:16:08 -0800 (PST) (envelope-from andre.albsmeier@mchp.siemens.de) X-Envelope-Sender-Is: andre.albsmeier@mchp.siemens.de (at relayer david.siemens.de) Received: from mail2.siemens.de (mail2.siemens.de [139.25.208.14]) by david.siemens.de (8.9.3/8.9.3) with ESMTP id RAA10435 for ; Sat, 27 Mar 1999 17:16:00 +0100 (MET) Received: from curry.mchp.siemens.de (curry.mchp.siemens.de [146.180.31.23]) by mail2.siemens.de (8.9.3/8.9.3) with ESMTP id RAA01666 for ; Sat, 27 Mar 1999 17:15:43 +0100 (MET) Received: (from daemon@localhost) by curry.mchp.siemens.de (8.8.8/8.8.8) id RAA73379 for ; Sat, 27 Mar 1999 17:15:44 +0100 (CET) Date: Sat, 27 Mar 1999 17:15:40 +0100 From: Andre Albsmeier To: Stuart Henderson Cc: Andre Albsmeier , Steve Price , freebsd-isp@FreeBSD.ORG, hamellr@dsinw.com Subject: Re: Need help fine-tuning a web server (fwd) Message-ID: <19990327171540.C21608@internal> References: <36FBA273.F6108F6B@eclipse.net.uk> <19990326161829.A17488@internal> <36FBAE8F.17384C3F@eclipse.net.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: <36FBAE8F.17384C3F@eclipse.net.uk>; from Stuart Henderson on Fri, Mar 26, 1999 at 03:58:07PM +0000 Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, 26-Mar-1999 at 15:58:07 +0000, Stuart Henderson wrote: > > Does -m486 also help on Pentium or Pentium II systems ? > > Yes it does. If you don't include it then gcc will only use instructions > that also work on 386's - enabling 486 optimizations will allow the use > of some extra opcodes that weren't available for 386's that can speed up > some operations. Hmm, let me quote from "man gcc": -m486 -mno-486 Control whether or not code is optimized for a 486 instead of an 386. Code generated for a 486 will run on a 386 and vice versa. "man gcc" says the m486 optimized code will run on a 386. But this would imply that these instructions are available on the 386 as well. I asked because I have heard that m486 optimization would slow things down on Pentium Processors... -Andre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message