I got you. Thanks. -----Original Message----- From: Randy Dunlap [mailto:rdunlap@xxxxxxxxxxxx] Sent: Saturday, September 18, 2010 1:48 PM To: Joshua Hintze Cc: 'Maxim Levitsky'; linux-kernel@xxxxxxxxxxxxxxx; linux-ide@xxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxx [mailto:linux-ide-owner@xxxxxxxxxxxxxxx] On Behalf Of Maxim Levitsky > Sent: Saturday, September 18, 2010 1:23 PM > To: Joshua Hintze > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-ide@xxxxxxxxxxxxxxx > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
