From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266757AbUGLJTl (ORCPT ); Mon, 12 Jul 2004 05:19:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266765AbUGLJTl (ORCPT ); Mon, 12 Jul 2004 05:19:41 -0400 Received: from smtp-out2.blueyonder.co.uk ([195.188.213.5]:18134 "EHLO smtp-out2.blueyonder.co.uk") by vger.kernel.org with ESMTP id S266757AbUGLJTi (ORCPT ); Mon, 12 Jul 2004 05:19:38 -0400 Message-ID: <40F257A8.10205@blueyonder.co.uk> Date: Mon, 12 Jul 2004 10:19:36 +0100 From: Sid Boyce Reply-To: sboyce@blueyonder.co.uk User-Agent: Mozilla Thunderbird 0.6 (X11/20040502) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Con Kolivas CC: Nuno Monteiro , linux-kernel@vger.kernel.org Subject: Re: 2.6.x Scheduler, preemption and responsiveness - puzzlement References: <40F1BA46.9000207@blueyonder.co.uk> <20040711221818.GA30704@outpost.ds9a.nl> <40F1C568.2070503@blueyonder.co.uk> <20040712000137.GA3854@hobbes.itsari.int> <40F1E409.4040200@blueyonder.co.uk> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 12 Jul 2004 09:19:53.0319 (UTC) FILETIME=[63D96F70:01C467F1] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con Kolivas wrote: > Sid Boyce writes: > >> Nuno Monteiro wrote: >> >>> >>> On 2004.07.11 23:55, Sid Boyce wrote: >>> >>>> I've been wondering why this is, I can't remember what the BIOS >>>> says about the hard drives, from memory it looked OK, I think it >>>> was set to >>> >>> >>> >>> >>> >>>> PCI IDE nVidia Corporation nForce2 IDE (rev a2) >>> >>> >>> >>> >>> >>>> # CONFIG_BLK_DEV_AMD74XX is not set >>> >>> >>> >>> You don't have the driver for your IDE chipset compiled in. In the >>> "ATA/ ATAPI/MFM/RLL support" under "Device Drivers" menu select "AMD >>> and nVidia IDE support". Also, you can disable the "Generic PCI IDE >>> Chipset Support" and the "VIA82CXXX chipset support" you seem to >>> have enabled. >>> >>> Then you should be able to do DMA, and things will go a lot faster. >>> >>> >>> Hope this helps. >>> >>> >>> >>> Nuno >> >> >> Oops!, thanks. The previous motherboard used the VIA chipset, so that >> got missed when I changed over. >> Regards >> Sid. > > > DMA disabled is perhaps the most common reason for poor performance > under I/O loads. I think some cut down configurations that people have > used from their 2.4 installations have missed the appropriate IDE driver. > > Cheers, > Con That fixed the problem. When I checked my P-II 333 box and AMD64 laptop (VIA chipset), they were OK. Working on 4 boxes at the same time, I guess I got stuck in a VIA mental groove. Regards Sid. -- Sid Boyce .... Hamradio G3VBV and keen Flyer ===== LINUX ONLY USED HERE =====