From owner-freebsd-hardware@FreeBSD.ORG Tue Sep 4 21:51:00 2007 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D2BDF16A419 for ; Tue, 4 Sep 2007 21:51:00 +0000 (UTC) (envelope-from cracauer@koef.zs64.net) Received: from koef.zs64.net (koef.zs64.net [212.12.50.230]) by mx1.freebsd.org (Postfix) with ESMTP id 6FA2213C478 for ; Tue, 4 Sep 2007 21:51:00 +0000 (UTC) (envelope-from cracauer@koef.zs64.net) Received: from koef.zs64.net (koef.zs64.net [212.12.50.230]) by koef.zs64.net (8.14.1/8.14.1) with ESMTP id l84Lowon085878; Tue, 4 Sep 2007 23:50:58 +0200 (CEST) (envelope-from cracauer@koef.zs64.net) Received: (from cracauer@localhost) by koef.zs64.net (8.14.1/8.14.1/Submit) id l84LowDa085877; Tue, 4 Sep 2007 17:50:58 -0400 (EDT) (envelope-from cracauer) Date: Tue, 4 Sep 2007 17:50:58 -0400 From: Martin Cracauer To: err Message-ID: <20070904215058.GA85717@cons.org> References: <20070829174236.6c33ccfc@n2.lands.raad> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070829174236.6c33ccfc@n2.lands.raad> User-Agent: Mutt/1.4.2.2i Cc: freebsd-hardware@freebsd.org Subject: Re: 8GB RAM: PAE or not PAE? X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Sep 2007 21:51:00 -0000 err wrote on Wed, Aug 29, 2007 at 05:42:36PM +0200: > Hi > > I have an HP DL380 quad core with 8GB of RAM and SAS disks in RAID, with freebsd 6 STABLE on it. > > Everything works fine, except for the RAM addressing problem: freebsd sees only 4GB. > I know it have been discussed, but it could be a problem to me for running a 64bit compiled system; what is the stability of a kernel compiled with the PAE option? > > I've a kernel with no modules, and before trying PAE I would know for other people experiences... > In particular I'm interested in the behavior of ciss, bce, em and usb stuff, and application like Perl, Ruby, PHP 5, MySQL server, heavy MAWK and bzip2 load. Usb? Ugh. But last time I ran i386+PAE was 6.2-beta and it ran fine with 8 GB and 8 processors, well enough to complete a complex benchmark suite. I wouldn't know about USB and other non-primary drivers. You should also be able to run a 100% 32 bit userland with a 64 bit kernel. I'll have to do that next weekend or whenever I find time, for other reasons. > Also, if I boot a PAE kernel, in order to have all my RAM available, I have to set the hw.physmem variable to 8G ? No. Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer http://www.cons.org/cracauer/ FreeBSD - where you want to go, today. http://www.freebsd.org/