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 :) Josh -----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 -- 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 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
