Date: Sat, 27 Mar 1999 17:15:40 +0100 From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: Stuart Henderson <stuart@eclipse.net.uk> Cc: Andre Albsmeier <andre.albsmeier@mchp.siemens.de>, Steve Price <sprice@hiwaay.net>, freebsd-isp@FreeBSD.ORG, hamellr@dsinw.com Subject: Re: Need help fine-tuning a web server (fwd) Message-ID: <19990327171540.C21608@internal> In-Reply-To: <36FBAE8F.17384C3F@eclipse.net.uk>; from Stuart Henderson on Fri, Mar 26, 1999 at 03:58:07PM %2B0000 References: <Pine.OSF.4.02.9903260846190.22203-100000@fly.HiWAAY.net> <36FBA273.F6108F6B@eclipse.net.uk> <19990326161829.A17488@internal> <36FBAE8F.17384C3F@eclipse.net.uk>
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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
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