From owner-svn-src-all@FreeBSD.ORG Tue Aug 31 19:40:24 2010 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8C3A410656BB; Tue, 31 Aug 2010 19:40:24 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 589798FC28; Tue, 31 Aug 2010 19:40:24 +0000 (UTC) Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net [66.111.2.69]) by cyrus.watson.org (Postfix) with ESMTPSA id EE00646B46; Tue, 31 Aug 2010 15:40:23 -0400 (EDT) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id F008E8A04E; Tue, 31 Aug 2010 15:40:22 -0400 (EDT) From: John Baldwin To: Matthew Jacob Date: Tue, 31 Aug 2010 15:39:56 -0400 User-Agent: KMail/1.13.5 (FreeBSD/7.3-CBSD-20100819; KDE/4.4.5; amd64; ; ) References: <201008311733.o7VHXmxX037013@svn.freebsd.org> <201008311350.17175.jhb@freebsd.org> <4C7D41E9.7060907@feral.com> In-Reply-To: <4C7D41E9.7060907@feral.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201008311539.57185.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (bigwig.baldwin.cx); Tue, 31 Aug 2010 15:40:23 -0400 (EDT) X-Virus-Scanned: clamav-milter 0.95.1 at bigwig.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.6 required=4.2 tests=AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on bigwig.baldwin.cx Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Pyun YongHyeon Subject: Re: svn commit: r212061 - head/sys/dev/bge X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Aug 2010 19:40:24 -0000 On Tuesday, August 31, 2010 1:54:49 pm Matthew Jacob wrote: > But not amd64 please. > > > Keep in mind the PAE case where you cannot effectively specify a 4GB > > boundary. I used a 2GB boundary for twa(4) in the PAE case to deal > > with the boundary issue. Probably though, bus_dma should just always > > enforce a 4GB boundary, at least on x86. Yes, thinking about this more, only i386 + PAE is special. All other cases could represent the 4GB boundary restriction in a bus dma tag for the PCI bus (or in the platform-specific Host-PCI bridge drivers). For i386 + PAE it might make sense to always enforce a 4GB boundary in the bus_dma code itself. -- John Baldwin