Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751238Ab3FWU6T (ORCPT ); Sun, 23 Jun 2013 16:58:19 -0400 Received: from terminus.zytor.com ([198.137.202.10]:42930 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750883Ab3FWU6S (ORCPT ); Sun, 23 Jun 2013 16:58:18 -0400 Message-ID: <51C7615B.5010508@zytor.com> Date: Sun, 23 Jun 2013 13:58:03 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6 MIME-Version: 1.0 To: Dave Airlie CC: Henrique de Moraes Holschuh , Brice Goglin , Linux Kernel Mailing List , David Airlie , dri-devel@lists.freedesktop.org, Andy Lutomirski Subject: Re: MTRR use in drivers References: <51C3DDFA.7050204@zytor.com> <51C69732.1010906@gmail.com> <20130623192936.GA28655@khazad-dum.debian.net> <51C75465.9060007@zytor.com> <51C75CD6.5010206@zytor.com> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 973 Lines: 28 On 06/23/2013 01:54 PM, Dave Airlie wrote: >>> breaking old boxes just because, is just going to get reverted when I >>> get the first regression report that you broke old boxes. >>> >> >> Not "just because", but *if* the choice is between breaking old boxes >> and breaking new boxes I'll take the latter. >> > > But Linus won't so your choice doesn't matter. I hate to break it to you, but we regress on ancient hardware all the time. Optimization work gets done on modern machines, so the sweet spot keeps moving. In particular, if supporting ancient hardware means leaving a lot of performance on modern hardware on the table, we may have to take that penalty. Fortunately, most of the time we don't have to. -hpa -- 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/