Date: Tue, 1 Sep 1998 09:17:32 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: shimon@simon-shapiro.org, freebsd-alpha@FreeBSD.ORG, Doug Rabson <dfr@nlsystems.com> Subject: Re: Alpha Install - oops! Message-ID: <Pine.LNX.4.02.9809010915570.17849-100000@feral-gw> In-Reply-To: <13804.2770.473870.7600@grasshopper.cs.duke.edu>
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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. > > > > Wow! > > Yeah. Tell me about it. There's another variable I forgot to mention > called dma_prefetch. On a MiataGL you want this on. It increases > the DMA read b/w from ~70MB/sec to ~103MB/sec (for 8k transfers). > (We currently turn this off in cia.c for non-GL miatas, but never turn > it on). > > Drew > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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