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Date: Sat, 18 Sep 2010 21:22:54 +0200 From: Maxim Levitsky <maximlevitsky@...il.com> To: Joshua Hintze <joshh@...ar.com> Cc: linux-kernel@...r.kernel.org, linux-ide@...r.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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