From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750817AbWF2MvO (ORCPT ); Thu, 29 Jun 2006 08:51:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750839AbWF2MvO (ORCPT ); Thu, 29 Jun 2006 08:51:14 -0400 Received: from smtp4.poczta.interia.pl ([80.48.65.7]:15136 "EHLO smtp4.poczta.interia.pl") by vger.kernel.org with ESMTP id S1750817AbWF2MvO (ORCPT ); Thu, 29 Jun 2006 08:51:14 -0400 Message-ID: <44A3CCB0.7080208@interia.pl> Date: Thu, 29 Jun 2006 14:50:56 +0200 From: =?ISO-8859-2?Q?Rafa=B3_Bilski?= User-Agent: Thunderbird 1.5.0.4 (X11/20060628) MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Re: [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from Longhaul by rw semaphores References: <44A2C9A7.6060703@interia.pl> <1151581077.23785.9.camel@localhost.localdomain> <44A3C17F.3060204@etpmod.phys.tue.nl> In-Reply-To: <44A3C17F.3060204@etpmod.phys.tue.nl> X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 8bit X-EMID: 14d1cacc Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Bart Hartgers napisał(a): > Alan Cox wrote: >> Ar Mer, 2006-06-28 am 20:25 +0200, ysgrifennodd Rafał Bilski: >>> AUTOHALT, this means interrupts must be disabled except for the time tick, >>> which should be reset to >=1ms. Care must be taken to avoid other system events >>> that could interfere with this operation. A few examples are snooping, NMI, >>> INIT, SMI and FLUSH." >> "snooping". So we do need the cache sorting out. >> > > If I understand correctly, trouble occurs when the processor tries to > snoop? Would disabling (via MSR) and flushing the caches before changing > the frequency help in that case? > > Groeten, > Bart > I will check that. If this was so simple all this time... I hope this "few examples" aren't many more. Rafał ---------------------------------------------------------------------- PS. Fajny portal... >>> http://link.interia.pl/f196a