From owner-freebsd-performance@FreeBSD.ORG Fri Feb 6 19:01:46 2004 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2CFAF16A4CE for ; Fri, 6 Feb 2004 19:01:46 -0800 (PST) Received: from mta7.pltn13.pbi.net (mta7.pltn13.pbi.net [64.164.98.8]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4B99543D31 for ; Fri, 6 Feb 2004 19:01:45 -0800 (PST) (envelope-from todd@qdsdirect.com) Received: from qdsdirect.com (adsl-65-68-200-81.dsl.rcsntx.swbell.net [65.68.200.81])id i1731h9D005237 for ; Fri, 6 Feb 2004 19:01:44 -0800 (PST) Message-ID: <4025A592.70909@qdsdirect.com> Date: Sat, 07 Feb 2004 20:57:22 -0600 From: Todd Lewis User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6b) Gecko/20031205 Thunderbird/0.4 X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-performance@freebsd.org Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Sun, 08 Feb 2004 11:48:34 -0800 Subject: frustratingly slow box at 4GB, but not 1GB of memory X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Feb 2004 03:01:46 -0000 Did you try compiling the kernel with the option options PAE Your at the 4 gig marker. It wouldn't supprise me if your system is having dificulty accessing the 4gigs. My rule of thumb is 1 gig of memory for every 256k of on chip cache. P4 have 256k~512k 1~2g memory. Xenons have 512k, 2g for each processor. Xenon MP 512k to 1meg cache etc. etc. http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html