linux-kernel - Re: Allocating buffers for USB transfers (again)

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Date:	Thu, 7 Jul 2011 14:38:51 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	linux-usb@...r.kernel.org, alsa-devel@...a-project.org,
	Takashi Iwai <tiwai@...e.de>,
	Clemens Ladisch <clemens@...isch.de>, florian@...kler.org,
	pedrib@...il.com, William Light <wrl@...est.net>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: Allocating buffers for USB transfers (again)

On Thu, Jul 7, 2011 at 2:33 PM, Oliver Neukum <oliver@...kum.org> wrote:

> PS:  Do you still see this if you enable 64bit DMA for EHCI?

The problem is that I personally don't see that issue at all. I even
installed 4GB of RAM to my development machine last year to be able to
reproduce this, but I can't, even when the memory allocator is under
heavy load. The only people who see this effect are Pedro Ribeiro and
William Light (both in Cc:), and both have been very helpful in trying
patches and reporting back in detail. Which instructions could we
probably give to these people to finally hunt this issue down?

Daniel
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