From owner-freebsd-arch Mon Oct 14 7:31:58 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 2791B37B401 for ; Mon, 14 Oct 2002 07:31:57 -0700 (PDT) Received: from phoenix.infradead.org (carisma.slowglass.com [195.224.96.167]) by mx1.FreeBSD.org (Postfix) with ESMTP id D5B9543E9C for ; Mon, 14 Oct 2002 07:31:51 -0700 (PDT) (envelope-from hch@infradead.org) Received: from hch by phoenix.infradead.org with local (Exim 4.10) id 1816Dt-0004Kg-00; Mon, 14 Oct 2002 15:29:33 +0100 Date: Mon, 14 Oct 2002 15:29:33 +0100 From: Christoph Hellwig To: Terry Lambert Cc: Christoph Hellwig , "M. Warner Losh" , wes@softweyr.com, dillon@apollo.backplane.com, vova@sw.ru, nate@root.org, arch@FreeBSD.ORG Subject: Re: Database indexes and ram Message-ID: <20021014152933.A16492@infradead.org> References: <200210082051.g98KpjU1084793@apollo.backplane.com> <3DA4C271.37AACAA3@softweyr.com> <20021012135245.A16453@infradead.org> <20021012.150616.129769790.imp@bsdimp.com> <20021013133106.C15151@infradead.org> <3DA9B4E1.1257DAA8@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <3DA9B4E1.1257DAA8@mindspring.com>; from tlambert2@mindspring.com on Sun, Oct 13, 2002 at 11:01:05AM -0700 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 Sun, Oct 13, 2002 at 11:01:05AM -0700, Terry Lambert wrote: > Christoph Hellwig wrote: > > On Sat, Oct 12, 2002 at 03:06:16PM -0600, M. Warner Losh wrote: > > > Unless the card is 64bit, it can't DMA past 4G. > > > > Right. But if you have a server with > 4GB memory you usually have > > thos cards. Dito for the non-PCI devices. > > Name one motherboard with more than 2 64 bit PCI slots. IBM summit (x440), IBM/Sequent NUMAQ, Unisys es7xxx, many serverworks-base big boards. Apples' current G4 PowerMACs, etc for the ones with 32bit CPUs. For 64bit CPUs: most PCI-based UltraSparcs, SGI SN0/SN1/SN2 (mips and ia64), many AlphaServers, many Power4-based IBM pSeries machiens, NEC AzusA, and I"m sure I forgot a few. Not to mention other designs on which Linux doesn't even run. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message