From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934319AbXC2Sqi (ORCPT ); Thu, 29 Mar 2007 14:46:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934321AbXC2Sqi (ORCPT ); Thu, 29 Mar 2007 14:46:38 -0400 Received: from postfix2-g20.free.fr ([212.27.60.43]:53200 "EHLO postfix2-g20.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934319AbXC2Sqh (ORCPT ); Thu, 29 Mar 2007 14:46:37 -0400 Message-ID: <460C094C.8070304@free.fr> Date: Thu, 29 Mar 2007 20:45:32 +0200 From: Kevin Perros User-Agent: Thunderbird 2.0b2 (X11/20070307) MIME-Version: 1.0 To: John CC: linux-kernel@vger.kernel.org Subject: Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically References: <46094728.40300@free.fr> <75b66ecd0703271341x34463c49w64bdac21a9741355@mail.gmail.com> <460A297A.2030200@free.fr> In-Reply-To: <460A297A.2030200@free.fr> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > No it is an "indutrial" motherboard. > Although I don't know what makes it "industrial". > > Regards. > > Is this related to SMM? > > As far as I can tell, the BIOS is Phoenix AwardBIOS v6.00PG. > > Would someone know how to disable SMM in this BIOS? Usually you cannot disable SMM via the BIOS. You have to write chipset specific Kernel code for that. By example, a module exist in RTAI's code base for Intel Chipset. You can assess your system's latencies using the -rt kernel calibration tools, located in Ingo Molnar's repository. Here is an introduction to SMI : http://www.securityfocus.com/columnists/402