Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751567AbZL1UFu (ORCPT ); Mon, 28 Dec 2009 15:05:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751363AbZL1UFt (ORCPT ); Mon, 28 Dec 2009 15:05:49 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:55234 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751294AbZL1UFt (ORCPT ); Mon, 28 Dec 2009 15:05:49 -0500 Date: Sun, 27 Dec 2009 12:09:48 +0100 From: Pavel Machek To: Andi Kleen Cc: 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: <20091227110947.GA1398@ucw.cz> References: <4B310879.9050701@compro.net> <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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091223170832.GH20539@basil.fritz.box> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1003 Lines: 27 > > > This might suggest that Mark's floppy controller doesn't like > > > deep C? Mark, did you try booting with processor.max_cstate=1 > > > and HPET enabled? > > > > We have indeed had historical issues with floppy and sleep states before. > > 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. C1 is hlt. Are you sure? I could see how C3 could cause problems (DMA latency), but... Can mark simply try with idle=poll? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/