From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265418AbTLHPY5 (ORCPT ); Mon, 8 Dec 2003 10:24:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265421AbTLHPY4 (ORCPT ); Mon, 8 Dec 2003 10:24:56 -0500 Received: from head.linpro.no ([80.232.36.1]:41117 "EHLO head.linpro.no") by vger.kernel.org with ESMTP id S265418AbTLHPYz (ORCPT ); Mon, 8 Dec 2003 10:24:55 -0500 Subject: 2.4: mylex and > 2GB RAM From: Per Buer Reply-To: perbu@linpro.no To: linux-kernel@vger.kernel.org Content-Type: text/plain Organization: Linpro AS Message-Id: <1070897058.25490.56.camel@netstat.linpro.no> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7) Date: Mon, 08 Dec 2003 16:24:19 +0100 Content-Transfer-Encoding: 7bit X-Spam-Score: -4.9 (----) X-Scanner: exiscan for exim4 (http://duncanthrax.net/exiscan/) *1ATNFj-0001VR-OP*Ttm8pUE7U2k* Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi. I have an Supermicro Superserver (wow!) 8040 or 8060 with a two Intel Xeon (p3-based with 1MB cache) and a Mylex AcceleRAID 352. We recently upgraded from 2 to 4GB of memory. There seems to a problem with IO and high memory. Suddenly IO performance will degrade dramatically (throughput of about 50KB/s). Booting the machine with "mem=2048" remedies this. We have tried replacing the memory with another make - no luck. Any hints? -- There are only 10 different kinds of people in the world, those who understand binary, and those who don't.