From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1RcEGg-0002V2-Af for garchives@archives.gentoo.org; Sun, 18 Dec 2011 10:46:58 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 8DDEA21C10A; Sun, 18 Dec 2011 10:46:44 +0000 (UTC) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by pigeon.gentoo.org (Postfix) with ESMTP id F32D321C10A for ; Sun, 18 Dec 2011 10:45:34 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp.gentoo.org (Postfix) with ESMTP id 3E1971B4002 for ; Sun, 18 Dec 2011 10:45:34 +0000 (UTC) X-Virus-Scanned: by amavisd-new using ClamAV at gentoo.org X-Spam-Flag: NO X-Spam-Score: -3.794 X-Spam-Level: X-Spam-Status: No, score=-3.794 tagged_above=-999 required=5.5 tests=[AWL=0.335, BAYES_00=-1.9, FREEMAIL_FROM=0.001, RP_MATCHES_RCVD=-2.228, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham Received: from smtp.gentoo.org ([127.0.0.1]) by localhost (smtp.gentoo.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id e5rGw71sRKJQ for ; Sun, 18 Dec 2011 10:45:27 +0000 (UTC) Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by smtp.gentoo.org (Postfix) with ESMTP id C27BC1B4008 for ; Sun, 18 Dec 2011 10:45:26 +0000 (UTC) Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1RcEF9-0007wK-44 for gentoo-user@gentoo.org; Sun, 18 Dec 2011 11:45:23 +0100 Received: from athedsl-374033.home.otenet.gr ([79.131.13.15]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 18 Dec 2011 11:45:23 +0100 Received: from realnc by athedsl-374033.home.otenet.gr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 18 Dec 2011 11:45:23 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: gentoo-user@lists.gentoo.org From: Nikos Chantziaras Subject: [gentoo-user] Re: -march=native is *EXTREMELY* conservative Date: Sun, 18 Dec 2011 12:45:27 +0200 Organization: Lucas Barks Message-ID: References: <20111217210709.GA1740@waltdnes.org> <20111218011054.GA2804@waltdnes.org> <20111218103449.GA21102@waltdnes.org> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: athedsl-374033.home.otenet.gr User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111117 Thunderbird/8.0 In-Reply-To: <20111218103449.GA21102@waltdnes.org> X-Archives-Salt: 0b642d07-afc4-4efd-bee4-1666d13f1be8 X-Archives-Hash: a147f8b1af20b1777aa042fef034a5c9 On 12/18/2011 12:34 PM, Walter Dnes wrote: > On Sat, Dec 17, 2011 at 08:10:54PM -0500, Walter Dnes wrote > >> The onboard GPU was initially incapable of handling 1080i video without >> stuttering badly and dropping frames. After explicitly changing the >> flags and rebuilding system+world+kernel, it displays 1080p videos >> flawlessly. That's one big "co-incidence". > > This was only recently installed. Is it possible that the generic x86 > code from the initial install was the problem? And that emerging > system+world got me full optimization? Could be. It could also be it's because of "-mfpmath=sse". That's only used by default on 64-bit. On 32-bit, the FPU is used for floating point operations by default, which gives better precision (80 bit vs 64 bit) but slower speed. But then again, that sounds too much of a performance difference. So if I had to guess, I'd say it's because of the world rebuild that made sure everything was built with proper optimizations.