From owner-freebsd-stable Wed Mar 19 10:25:15 2003 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BD4B137B401; Wed, 19 Mar 2003 10:25:13 -0800 (PST) Received: from smtpproxy2.mitre.org (smtpproxy2.mitre.org [192.80.55.70]) by mx1.FreeBSD.org (Postfix) with ESMTP id EF34A43F93; Wed, 19 Mar 2003 10:25:12 -0800 (PST) (envelope-from jandrese@mitre.org) Received: from avsrv2.mitre.org (avsrv2.mitre.org [128.29.154.4]) by smtpproxy2.mitre.org (8.12.8/8.12.8) with ESMTP id h2JIPCOC023429; Wed, 19 Mar 2003 13:25:12 -0500 (EST) Received: from MAILHUB2 (mailhub2.mitre.org [129.83.221.18]) by smtpsrv2.mitre.org (8.12.8/8.12.8) with ESMTP id h2JIPAk2028829; Wed, 19 Mar 2003 13:25:10 -0500 (EST) Received: from mm112324-2k.mitre.org (128.29.3.65) by mailhub2.mitre.org with SMTP id 1575200; Wed, 19 Mar 2003 13:25:09 -0500 Message-ID: <3E78B604.70909@mitre.org> Date: Wed, 19 Mar 2003 13:25:08 -0500 From: Jason Andresen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3) Gecko/20030312 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ulrich Spoerlein Cc: Doug Barton , stable@freebsd.org Subject: Re: HEADSUP: XFree86 4.3.0 update References: <200303180051.LAA03851@lightning.itga.com.au> <20030319003933.J88684@znfgre.tberna.bet> <20030319181304.GC335@galgenberg.net> In-Reply-To: <20030319181304.GC335@galgenberg.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Ulrich Spoerlein wrote: > On Wed, 19.03.2003 at 00:40:41 -0800, Doug Barton wrote: > >>> Make sure your X session is running with depth >= 16!!!! >> >>I read an article from what should be a reliable source that said all >>modern SVGA cards perform best at their maximum color depth, since that's >>how they're optimized. > > > _Probably_ true for 2D and Desktop usage (though I doubt it) and > _definitely_ not true for 3D Usage (all those 32bit textures need to be > transferred from Chip <-> RAM, the smaller they are the faster the card > goes). > > So the 16 vs 32 bit case is clear. But it might be true that 8bit modes > "suck" at newer hardware (because of emulation?) I've heard this said many times over the years, but when I go and actually benchmark my cards I always find that they perform faster at lower bit depths. Granted this is fairly simple stuff like xengine, but it has been a constant. It's easy to test on your machine. Just start X in the various bitdepths and run a few benchmarks. I'd be interested to know if there are actually cards out there that prefer higher bit depths. 8 bit is usually considerably faster than the 15/16/24/32 bit cases as well. -- \ |_ _|__ __|_ \ __| Jason Andresen jandrese@mitre.org |\/ | | | / _| Network and Distributed Systems Engineer _| _|___| _| _|_\___| Office: 703-883-7755 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message