Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756650AbZLYUdI (ORCPT ); Fri, 25 Dec 2009 15:33:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756289AbZLYUdG (ORCPT ); Fri, 25 Dec 2009 15:33:06 -0500 Received: from one.firstfloor.org ([213.235.205.2]:47649 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753071AbZLYUdG (ORCPT ); Fri, 25 Dec 2009 15:33:06 -0500 Date: Fri, 25 Dec 2009 21:33:04 +0100 From: Andi Kleen To: Arjan van de Ven Cc: Andi Kleen , Linus Torvalds , Mark Hounschell , "Pallipadi, Venkatesh" , "dmarkh@cfl.rr.com" , Alain Knaff , Linux Kernel Mailing List , "fdutils@fdutils.linux.lu" , "Li, Shaohua" , Ingo Molnar Subject: Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28 Message-ID: <20091225203304.GA22306@basil.fritz.box> References: <1261525076.16916.4.camel@localhost.localdomain> <4B3162BC.9000508@cfl.rr.com> <4B3214EC.6020308@compro.net> <6598A4E21F1DB24D80BF72956484F59802EFD1C6@orsmsx001.amr.corp.intel.com> <4B32386B.2060509@compro.net> <87bphpd4rt.fsf@basil.nowhere.org> <20091223170832.GH20539@basil.fritz.box> <20091225132116.6c9089f2@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091225132116.6c9089f2@infradead.org> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1017 Lines: 27 On Fri, Dec 25, 2009 at 01:21:16PM +0100, Arjan van de Ven wrote: > On Wed, 23 Dec 2009 18:08:32 +0100 > Andi Kleen wrote: > > > I removed that code when moving to 64bit (floppy driver disabling C1), > > but perhaps we need some variant of it again (but it's the first such > > report in many years). Although it would be sad to have it again on > > all systems. > > at least now we have the pmqos infrastructure, driver just needs to ask > for 0 latency ;) Does pmqos work with apci=off etc.? I didn't think it shut down the classic "HLT" idle, does it? The old i386 systems needed that apparently, they long pre date any deeper idle states. Anyways the code is still there for 32bit. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/