Date: Tue, 15 Oct 2002 11:51:58 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Peter Wemm <peter@wemm.org> Cc: arch@FreeBSD.org Subject: Re: Database indexes and ram Message-ID: <15788.14750.474882.99633@grasshopper.cs.duke.edu> In-Reply-To: <20021015011435.763AE2A88D@canning.wemm.org> References: <3DAA695F.96E345E6@mindspring.com> <20021015011435.763AE2A88D@canning.wemm.org>
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Peter Wemm writes: > Terry Lambert wrote: > > Peter Wemm wrote: > > > And then there's the AGP remap table stuff to provide a window from > > > anywhere in memory into the lower 4G of space that's within reach of 32 bit > > > PCI devices... > > > > Peter, you are sneaky... in a good way. > > > > Do you really think this could be abused this way? How much, in the > > way of windows, can you have lying around at one time? I'm not very > > AGP-aware, other than "I need it for my X server". > > I cant claim credit for this.. The linux folks supposedly have it working - > David O'Brien told me about it. > FWIW, Doug Rabson thought of this a few years ago when we first ported FreeBSD/alpha to the API UP1x000. Unlike most alphas, it has an AGP slot, and it does not have a pci chipset capable of doing scatter/gather dma mapping. Doug suggested that I use the AGP remap table for ISA dma, but I could never make it work. I ended up just doing bounce buffers. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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