Date: Tue, 1 Sep 1998 12:31:48 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: mjacob@feral.com Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: Alpha Install - oops! Message-ID: <13804.8316.576176.582569@grasshopper.cs.duke.edu> In-Reply-To: <Pine.LNX.4.02.9809010915570.17849-100000@feral-gw> References: <13804.2770.473870.7600@grasshopper.cs.duke.edu> <Pine.LNX.4.02.9809010915570.17849-100000@feral-gw>
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Matthew Jacob writes: > > > I'd watch this for crossing page boundaries on reads if you're using any > S/G map stuff. In fact, I'd have an extra mapping at the end of > the S/G list that just remaps the first page so that any prefetch > on a read won't get a fault but will just pick up known good data. Gee, I'd hope a GL would be smart enough not to prefectch past the end of a S/G segment; I do know that the page-boundry DMA restriction is gone on GL's. However, I use the direct-map segment in my Myrinet drivers (on DU & on *BSD), so I can't verify that it doesn't happen. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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