From owner-freebsd-questions@FreeBSD.ORG Sun Dec 19 05:39:43 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E38FA16A4CE for ; Sun, 19 Dec 2004 05:39:43 +0000 (GMT) Received: from relay02.mail-hub.kbs.net.au (relay02.mail-hub.kbs.net.au [202.136.32.45]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6D4A243D41 for ; Sun, 19 Dec 2004 05:39:41 +0000 (GMT) (envelope-from peterzelezny@dodo.com.au) Received: from [220.240.114.182] (helo=pzbox.localdomain) by relay02.mail-hub.kbs.net.au with smtp (Exim 4.34) id 1Cftn7-0005Mk-Eu for freebsd-questions@freebsd.org; Sun, 19 Dec 2004 16:39:37 +1100 Date: Sun, 19 Dec 2004 16:39:52 +1100 From: Peter Zelezny To: freebsd-questions@freebsd.org Message-Id: <20041219163952.4e387060.peterzelezny@dodo.com.au> X-Mailer: Sylpheed version 0.9.99 (GTK+ 1.2.10; i386-vine-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: MD driver on physical ram? (64MB cachable problem) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Dec 2004 05:39:44 -0000 Hi All, Would it be possible to use the 'md' driver on a physical address? I'm particularly interested if someone has some hacks or custom patches that would allow this. The problem I have on some old hardware is that the chipset can only cache the first 64MB in L2, but the machine has 128MB total. I'd like to limit the memory with MAXMEM=64M, and then mount the remaining memory as a very fast swap drive. Thanks in advance for any ideas. Peter.