Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762107AbXJYUUc (ORCPT ); Thu, 25 Oct 2007 16:20:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762696AbXJYUUF (ORCPT ); Thu, 25 Oct 2007 16:20:05 -0400 Received: from mailout.stusta.mhn.de ([141.84.69.5]:57921 "EHLO mailhub.stusta.mhn.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1762674AbXJYUUB (ORCPT ); Thu, 25 Oct 2007 16:20:01 -0400 Date: Thu, 25 Oct 2007 22:20:31 +0200 From: Adrian Bunk To: Michael Lothian Cc: linux-kernel@vger.kernel.org Subject: Re: Possibility of adding -march=native to x86 Message-ID: <20071025202031.GU30533@stusta.de> References: <0EC33A59AA72084CA28B83816B40929F02682BB3@REEDXCLSXM01V03.rbsres01.net> <20071025185022.GP30533@stusta.de> <20071025191723.GQ30533@stusta.de> <20071025195020.GS30533@stusta.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1034 Lines: 28 On Thu, Oct 25, 2007 at 09:12:45PM +0100, Michael Lothian wrote: > > The MPENTIUM4 option does not only set -march=pentium4, it also enables > > several other options in arch/i386/Kconfig.cpu resulting in better > > performance. > > How about an autodetect to set the right options here too using cpuid? > > With a warning of course that the code produced will be specifically > for the native cpu that it's compiled on. If you don't know or can figure out yourself the CPU you have, you'd better not compile your own kernel... cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/