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From: "Menon, Nishanth" <nm@ti.com>
To: Ameya Palande <2ameya@gmail.com>
Cc: "Gupta, Ramesh" <grgupta@ti.com>,
	Kevin Hilman <khilman@deeprootsystems.com>,
	"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
	"Ramirez Luna, Omar" <x00omar@ti.com>,
	"Kanigeri, Hari" <h-kanigeri2@ti.com>,
	Ameya Palande <ameya.palande@nokia.com>,
	"Guzman Lugo, Fernando" <x0095840@ti.com>
Subject: RE: dma_alloc_coherent bug?
Date: Mon, 16 Mar 2009 14:09:19 -0500	[thread overview]
Message-ID: <7A436F7769CA33409C6B44B358BFFF0CFF5A46E5@dlee02.ent.ti.com> (raw)
In-Reply-To: <269694c00903161029x37c44fe8q9e550b7b81b01913@mail.gmail.com>

> -----Original Message-----
> From: Ameya Palande [mailto:2ameya@gmail.com]
> Sent: Monday, March 16, 2009 7:30 PM
> To: Menon, Nishanth
> Cc: Gupta, Ramesh; Kevin Hilman; linux-omap@vger.kernel.org; Ramirez Luna,
> Omar; Kanigeri, Hari; Ameya Palande; Guzman Lugo, Fernando
> Subject: Re: dma_alloc_coherent bug?
> 
> There seems to be a bug some where inside DMA / VM area which is
> causing this fragmentation.
> 
> Any clue??
Russell mentioned sometime back:
http://lkml.indiana.edu/hypermail/linux/kernel/0706.0/0370.html

So I suppose dma_alloc_coherent for > 1page size(4096) is bad? If so hmm.. I am guessing audio driver and others do use dma_alloc_coherent.. I tried my dummy driver on omapzoom master and it seemd to work fine there for 10K iterations :(.. should'nt the same fragmentation hit there too?

Any clues?

Regards,
Nishanth Menon


  reply	other threads:[~2009-03-16 19:09 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-13  0:23 Bridge issue #3! dma_alloc_coherent causing crash - pm branch Menon, Nishanth
2009-03-13  0:34 ` Kevin Hilman
2009-03-13  8:04   ` Menon, Nishanth
2009-03-13  9:48     ` Gupta, Ramesh
2009-03-13 15:59       ` Kevin Hilman
2009-03-14  4:26         ` Gupta, Ramesh
2009-03-16  9:54           ` dma_alloc_coherent bug? Menon, Nishanth
2009-03-16 17:29             ` Ameya Palande
2009-03-16 19:09               ` Menon, Nishanth [this message]
2009-03-17  6:16                 ` dma_alloc_coherent fragmentation Menon, Nishanth

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