Date: Mon, 02 Aug 1999 23:26:31 -0400 From: "Louis A. Mamakos" <louie@TransSys.COM> To: Doug Ambrisko <ambrisko@whistle.com> Cc: multimedia@FreeBSD.ORG Subject: Re: 3D board for XFree86 GLX - Please recommend Message-ID: <199908030326.XAA08033@whizzo.transsys.com> In-Reply-To: Your message of "Mon, 02 Aug 1999 09:58:28 PDT." <199908021658.JAA97273@whistle.com> References: <199908021658.JAA97273@whistle.com>
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> Doug Rabson writes: > | On Sun, 1 Aug 1999, Marc van Woerkom wrote: > | > Possible. AGP bandwith is 2x or 4x of PCI. > | AGP is 2x or 4x 32bit PCI at 33Mhz. 64bit PCI at 66Mhz matches AGP speeds > | without reinventing the wheel... > > Yep, I hate AGP ... my guess is Intel had trouble making a real PCI slot > work like it is supposed to so they invented AGP so they only had to > make one separate PCI slot work. Well, there is a bit more to it than that. I think the AGP slot (and associated support chips) also include a mapping capability so that the AGP peripheral can do DMA bus cycles to virtual addresses you hand to it. This could be handy so that you don't need contiguous physical memory for texture maps, etc. Of course I'm sure this is some new invention, totally unlike the UNIBUS mapping registers we used in the dark ages. louie To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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