Date: Wed, 19 Mar 2003 13:25:08 -0500 From: Jason Andresen <jandrese@mitre.org> To: Ulrich Spoerlein <q@uni.de> Cc: Doug Barton <DougB@freebsd.org>, stable@freebsd.org Subject: Re: HEADSUP: XFree86 4.3.0 update Message-ID: <3E78B604.70909@mitre.org> In-Reply-To: <20030319181304.GC335@galgenberg.net> References: <200303180051.LAA03851@lightning.itga.com.au> <20030319003933.J88684@znfgre.tberna.bet> <20030319181304.GC335@galgenberg.net>
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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
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