From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261562AbVGYAr5 (ORCPT ); Sun, 24 Jul 2005 20:47:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261564AbVGYAr4 (ORCPT ); Sun, 24 Jul 2005 20:47:56 -0400 Received: from imap.gmx.net ([213.165.64.20]:29402 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S261562AbVGYAr4 (ORCPT ); Sun, 24 Jul 2005 20:47:56 -0400 X-Authenticated: #28678167 Message-ID: <42E4373D.1070607@gmx.net> Date: Mon, 25 Jul 2005 02:50:05 +0200 From: Andreas Baer User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050725) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Problem with Asus P4C800-DX and P4 -Northwood- Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi everyone, First I want to say sorry for this BIG post, but it seems that I have no other chance. :) I have a Asus P4C800-DX with a P4 2,4 GHz 512 KB L2 Cache "Northwood" Processor (lowest Processor that supports HyperThreading) and 1GB DDR400 RAM. I'm also running S-ATA disks with about 50 MB/s (just to show that it shouldn't be due to hard disk speed). Everything was bought back in 2003 and I recently upgraded to the lastest BIOS Version. I've installed Gentoo Linux and WinXP with dual-boot on this system. Now to my problem: I'm currently developing a little database in C++ (runs currently under Windows and Linux) that internally builds up an R-Tree and does a lot of equality tests and other time consuming checks. For perfomance issue I ran a test with 200000 entries and it took me about 3 minutes to complete under Gentoo Linux. So I ran the same test in Windows on the same platform and it took about 30(!) seconds. I was a little bit surprised about this result so I started to run several tests on different machines like an Athlon XP 2000+ platform and on my P4 3GHz "Prescott" Notebook and they all showed something about 30 seconds or below. Then I began to search for errors or any misconfiguration in Gentoo, in my code and also for people that have made equal experiences with that hardware configuration on the internet. I thought I have a problem with a broken gcc or libraries like glibc or libstdc++ and so I recompiled my whole system with the stable gcc 3.3.5 release, but that didn't make any changes. I also tried an Ubuntu and a Suse LiveCD to verify that it has nothing to do with Gentoo and my kernel version and they had the same problem and ran the test in about 3 min. Currently I'm at a loss what to do. I'm beginning to think that this is maybe a kernel problem because I have no problems under Windows and it doesn't matter whether I change any software or any configuration in Gentoo. I'm currently running kernel-2.6.12, but the Livecd's had other kernels. HyperThreading(HT) is also not the reason for the loss of power, because I tried to disable it and to create a uniprocessor kernel, but that didn't solve the problem. If you need some output of my configuration/log files or anything like that, just mail me. Is it possible that the kernel has a lack of support for P4 with "Northwood" core? Maybe only this one? Could I solve the problem if I change the processor to a "Prescott" core? Perhaps someone could provide any information if this would make any sense or not. Thanks in advance for anything that could help. ...sorry for bad english :)