From owner-freebsd-alpha Tue Sep 1 09:18:52 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA04274 for freebsd-alpha-outgoing; Tue, 1 Sep 1998 09:18:52 -0700 (PDT) (envelope-from owner-freebsd-alpha@FreeBSD.ORG) Received: from feral.com (gw100.feral.com [192.67.166.129]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA04264 for ; Tue, 1 Sep 1998 09:18:51 -0700 (PDT) (envelope-from mjacob@feral.com) Received: from localhost (mjacob@localhost) by feral.com (8.8.6/8.8.6) with SMTP id JAA18157; Tue, 1 Sep 1998 09:17:33 -0700 Date: Tue, 1 Sep 1998 09:17:32 -0700 (PDT) From: Matthew Jacob X-Sender: mjacob@feral-gw Reply-To: mjacob@feral.com To: Andrew Gallatin cc: shimon@simon-shapiro.org, freebsd-alpha@FreeBSD.ORG, Doug Rabson Subject: Re: Alpha Install - oops! In-Reply-To: <13804.2770.473870.7600@grasshopper.cs.duke.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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