From owner-freebsd-arch Sun Oct 13 3:38:11 2002 Delivered-To: freebsd-arch@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 17FE837B401 for ; Sun, 13 Oct 2002 03:38:10 -0700 (PDT) Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id D3C5E43E75 for ; Sun, 13 Oct 2002 03:38:08 -0700 (PDT) (envelope-from ticso@cicely8.cicely.de) Received: from cicely5.cicely.de (cicely5.cicely.de [IPv6:3ffe:400:8d0:301:200:92ff:fe9b:20e7]) by srv1.cosmo-project.de (8.12.5/8.12.5) with ESMTP id g9DAb06K003317 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=OK); Sun, 13 Oct 2002 12:37:35 +0200 (CEST) (envelope-from ticso@cicely8.cicely.de) Received: from cicely8.cicely.de (cicely8.cicely.de [10.1.1.10]) by cicely5.cicely.de (8.12.6/8.12.6) with ESMTP id g9DAaugK096974 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Sun, 13 Oct 2002 12:36:56 +0200 (CEST) (envelope-from ticso@cicely8.cicely.de) Received: from cicely8.cicely.de (localhost [127.0.0.1]) by cicely8.cicely.de (8.12.6/8.12.6) with ESMTP id g9DAatlv033775; Sun, 13 Oct 2002 12:36:55 +0200 (CEST) (envelope-from ticso@cicely8.cicely.de) Received: (from ticso@localhost) by cicely8.cicely.de (8.12.6/8.12.6/Submit) id g9DAZc6G033774; Sun, 13 Oct 2002 12:35:38 +0200 (CEST) Date: Sun, 13 Oct 2002 12:35:38 +0200 From: Bernd Walter To: "M. Warner Losh" Cc: hch@infradead.org, wes@softweyr.com, dillon@apollo.backplane.com, vova@sw.ru, nate@root.org, arch@FreeBSD.org Subject: Re: Database indexes and ram Message-ID: <20021013103538.GG17920@cicely8.cicely.de> Reply-To: ticso@cicely.de References: <200210082051.g98KpjU1084793@apollo.backplane.com> <3DA4C271.37AACAA3@softweyr.com> <20021012135245.A16453@infradead.org> <20021012.150616.129769790.imp@bsdimp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20021012.150616.129769790.imp@bsdimp.com> X-Operating-System: FreeBSD cicely8.cicely.de 5.0-CURRENT i386 User-Agent: Mutt/1.5.1i Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, Oct 12, 2002 at 03:06:16PM -0600, M. Warner Losh wrote: > In message: <20021012135245.A16453@infradead.org> > Christoph Hellwig writes: > : On Wed, Oct 09, 2002 at 04:57:37PM -0700, Wes Peters wrote: > : > Linux solved this problem by refusing to do it. The candidates for DMA > : > transfers include skbufs and buffers from the disk buffer pool, both of > : > which are allocated from the lowest 4GB of physical ram when using PAE > : > mode. > : > : Umm, Linux _does_ DMA into any memory if the NIC/HBA/whatever supports > : it. > > Unless the card is 64bit, it can't DMA past 4G. Shouldn't all modern pci chips support two 32bit word addresses. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message