Date: Tue, 01 Sep 1998 09:52:16 -0700 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: mjacob@feral.com, freebsd-alpha@FreeBSD.ORG Subject: Re: Alpha Install - oops! Message-ID: <199809011652.JAA11800@lestat.nas.nasa.gov>
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On Tue, 1 Sep 1998 12:31:48 -0400 (EDT) Andrew Gallatin <gallatin@cs.duke.edu> wrote: > 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. The hardware can prefetch past the last real S/G segment. When I implemented S/G map DMA in NetBSD/alpha, I had to add a spill pte after the last valid segment. Jason R. Thorpe thorpej@nas.nasa.gov NASA Ames Research Center Home: +1 408 866 1912 NAS: M/S 258-5 Work: +1 650 604 0935 Moffett Field, CA 94035 Pager: +1 650 940 5942 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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