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

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Date:	Thu, 7 Jul 2011 17:16:20 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Daniel Mack <zonque@...il.com>
Cc:	Oliver Neukum <oliver@...kum.org>, linux-usb@...r.kernel.org,
	alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.de>,
	Clemens Ladisch <clemens@...isch.de>, pedrib@...il.com,
	William Light <wrl@...est.net>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, Robert Hancock <hancockrwd@...il.com>
Subject: Re: Allocating buffers for USB transfers (again)

[adding Robert Hancock]
see here for the whole thread: https://lkml.org/lkml/2011/7/7/150

2011/7/7 Daniel Mack <zonque@...il.com>:
> 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
>
>

Did someone affected already try the suggestions from Robert :
http://lkml.org/lkml/2010/4/10/66

That is checking if it really is a 64bit vs 32bit issue by booting
with mem=4096M ?


Regards,
Flo
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