From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751397AbWF2MDX (ORCPT ); Thu, 29 Jun 2006 08:03:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751871AbWF2MDX (ORCPT ); Thu, 29 Jun 2006 08:03:23 -0400 Received: from mailhost.tue.nl ([131.155.2.19]:49373 "EHLO mailhost.tue.nl") by vger.kernel.org with ESMTP id S1751397AbWF2MDW (ORCPT ); Thu, 29 Jun 2006 08:03:22 -0400 Message-ID: <44A3C17F.3060204@etpmod.phys.tue.nl> Date: Thu, 29 Jun 2006 14:03:11 +0200 From: Bart Hartgers User-Agent: Thunderbird 1.5.0.4 (X11/20060527) MIME-Version: 1.0 To: =?UTF-8?B?UmFmYcWCIEJpbHNraQ==?= Cc: Alan Cox , Greg Kroah-Hartman , 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> In-Reply-To: <1151581077.23785.9.camel@localhost.localdomain> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 -- Bart Hartgers - TUE Eindhoven - http://plasimo.phys.tue.nl/bart/contact/