From owner-freebsd-hardware@FreeBSD.ORG Wed Aug 29 21:19:49 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 10CD016A421 for ; Wed, 29 Aug 2007 21:19:49 +0000 (UTC) (envelope-from jgrosch@juniper.net) Received: from smtpa.juniper.net (smtpa.juniper.net [207.17.137.120]) by mx1.freebsd.org (Postfix) with ESMTP id DDF4913C48A for ; Wed, 29 Aug 2007 21:19:48 +0000 (UTC) (envelope-from jgrosch@juniper.net) Received: from unknown (HELO emailsmtp55.jnpr.net) ([172.24.18.132]) by smtpa.juniper.net with ESMTP; 29 Aug 2007 13:51:11 -0700 X-IronPort-AV: i="4.19,323,1183359600"; d="scan'208"; a="69952688:sNHT39944920" Received: from odin.juniper.net ([172.24.115.43]) by emailsmtp55.jnpr.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 29 Aug 2007 13:51:10 -0700 Received: by odin.juniper.net (Postfix, from userid 200) id A578CA6DAD; Wed, 29 Aug 2007 13:51:10 -0700 (PDT) Date: Wed, 29 Aug 2007 13:51:10 -0700 From: Josef Grosch To: err Message-ID: <20070829205110.GA68658@juniper.net> 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 Organization: Juniper Networks X-OriginalArrivalTime: 29 Aug 2007 20:51:10.0714 (UTC) FILETIME=[5475E5A0:01C7EA7E] 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 Reply-To: jgrosch@juniper.net List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Aug 2007 21:19:49 -0000 On Wed, Aug 29, 2007 at 05:42:36PM +0200, err wrote: > 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. > > 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 ? > > Thanks > -- > Emmanuel Richiardone Based on my experience with PAE I would say, don't. I found PAE to be very brittle. Not all the drivers work well with PAE. Most recent Intel processors understand 64bit. I have several machines in our datacenter which are Intel 5160 running amd64. Josef -- FreeBSD 6.2 | Josef Grosch | Listen, strange women lying in ponds distributing jgrosch@juniper.net | swords is no basis for a system of government.