From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755960Ab0IRUC7 (ORCPT ); Sat, 18 Sep 2010 16:02:59 -0400 Received: from mail-da-3.dns-solutions.net ([69.12.112.3]:56765 "HELO mail-da-3.dns-solutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753633Ab0IRUC6 (ORCPT ); Sat, 18 Sep 2010 16:02:58 -0400 From: "Joshua Hintze" To: "'Randy Dunlap'" Cc: "'Maxim Levitsky'" , , References: <00d401cb55f7$33a78210$9af68630$@com> <20100917154732.330c4b1b@varda> <010901cb5754$ae6735a0$0b35a0e0$@com> <1284837774.12425.1.camel@localhost.localdomain> <010d01cb5769$cbca3380$635e9a80$@com> <20100918124750.393a64a8.rdunlap@xenotime.net> In-Reply-To: <20100918124750.393a64a8.rdunlap@xenotime.net> Subject: RE: PATA IDE is slower in newer versions of kernel Date: Sat, 18 Sep 2010 14:02:50 -0600 Message-ID: <010e01cb576c$7909c900$6b1d5b00$@com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: ActXamJy0z4norJ7Q62dpuB137KH7gAAg+gw Content-Language: en-us Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I got you. Thanks. -----Original Message----- From: Randy Dunlap [mailto:rdunlap@xenotime.net] Sent: Saturday, September 18, 2010 1:48 PM To: Joshua Hintze Cc: 'Maxim Levitsky'; linux-kernel@vger.kernel.org; linux-ide@vger.kernel.org Subject: Re: PATA IDE is slower in newer versions of kernel On Sat, 18 Sep 2010 13:43:40 -0600 Joshua Hintze wrote: > Thanks, > > I'm not sure what you mean by bisect, other than just the definition of the word. I am breaking this problem down adding printks etc. I think I'm finally beginng to understand how this works :) > http://www.kernel.org/pub/software/scm/git/docs/git-bisect.html http://www.kernel.org/pub/software/scm/git/docs/user-manual.html#using-bisec t > > > -----Original Message----- > From: linux-ide-owner@vger.kernel.org [mailto:linux-ide-owner@vger.kernel.org] On Behalf Of Maxim Levitsky > Sent: Saturday, September 18, 2010 1:23 PM > To: Joshua Hintze > Cc: linux-kernel@vger.kernel.org; linux-ide@vger.kernel.org > Subject: RE: PATA IDE is slower in newer versions of kernel > > On Sat, 2010-09-18 at 11:12 -0600, Joshua Hintze wrote: > > Some updated information. I created a screen capture of what I am seeing. First is the logic analyzer when the newer linux kernel is writing slow to the PATA port. > > > > http://i56.tinypic.com/oqhrug.png > > > > Notice in the above link how there is a lot of activating and then large gaps of no activity. After about 9 mS the STOP line is strobed a few times and then DMARQ finally returns to normal operating. The link below shows the picture of an old 2.6.10 kernel where write speeds are much faster. > > > > http://i51.tinypic.com/a9wiur.png > > > > In the above image notice how the wait time is considerable less 100's of microseconds before the stop lines get strobed. > > > > I'm dedicated to continue working on the problem, I just need to advice from the linux community. I've tried different I/O schedulers such as noop and anticipatory and I'm studying the ide-dma code but still lost to where this is happening. > > > > Thanks! > > > Maybe you can just bisect this? > Just a general advice, I don't know ide subsystem at all. > > Best regards, > Maxim Levitsky --- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code *** No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3132 - Release Date: 09/18/10 00:34:00