Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752286AbZLZJgm (ORCPT ); Sat, 26 Dec 2009 04:36:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751664AbZLZJgf (ORCPT ); Sat, 26 Dec 2009 04:36:35 -0500 Received: from casper.infradead.org ([85.118.1.10]:59979 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751774AbZLZJg1 (ORCPT ); Sat, 26 Dec 2009 04:36:27 -0500 Date: Sat, 26 Dec 2009 10:38:35 +0100 From: Arjan van de Ven To: Andi Kleen 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: <20091226103835.68479100@infradead.org> In-Reply-To: <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> <20091225203304.GA22306@basil.fritz.box> Organization: Intel X-Mailer: Claws Mail 3.7.3 (GTK+ 2.16.6; i586-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1211 Lines: 35 On Fri, 25 Dec 2009 21:33:04 +0100 Andi Kleen wrote: > 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.? yes > I didn't think it shut down > the classic "HLT" idle, does it? it does if you specify a latency of 0; it will then go into the spin-only state until you give up your latency requirement -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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/