Date: Tue, 16 Oct 2007 12:47:25 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Alexander Motin <mav@FreeBSD.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Video memory as swap under FreeBSD Message-ID: <86zlyj5oaq.fsf@ds4.des.no> In-Reply-To: <4711D237.30808@FreeBSD.org> (Alexander Motin's message of "Sun\, 14 Oct 2007 11\:24\:23 %2B0300") References: <1192209799.00813194.1192199401@10.7.7.3> <1192213457.00813222.1192203001@10.7.7.3> <1192242238.00813408.1192231802@10.7.7.3> <1192289079.00813583.1192278003@10.7.7.3> <4711D237.30808@FreeBSD.org>
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Alexander Motin <mav@FreeBSD.org> writes: > Dag-Erling Sm=C3=B8rgrav <des@des.no> writes: > > Arne Schwabe <schwabe@uni-paderborn.de> writes: > > > Video RAM may also not be as stable as your main RAM. I mean > > > nobody [cares] if a bit flips in video ram. > > That may have been true fifteen years ago, but not today. > Have the anybody ever seen ECC video RAM? Video RAM usually works on > higher frequencies then main RAM and IMHO it must affect stability. > For video RAM some percent of errors is really less important, I have > seen it myself with my previous video card until it died completely. A modern video adapter is basically a processor with a specialized instruction set and multiple parallel pipelines. Video memory is not just a frame buffer, it contains code and structured data (textures, polygon lists etc.) If you're lucky, a single-bit error might just change the color of a pixel, but it might also crash the GPU. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
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