linux-kernel - Re: [PATCH] atl1: disable 64bit DMA

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Date:	Mon, 25 Jun 2007 18:00:39 -0500
From:	Jay Cliburn <jacliburn@...lsouth.net>
To:	Chris Snook <csnook@...hat.com>
Cc:	"Jay L. T. Cornwall" <jay@...na.co.uk>,
	Luca Tettamanti <kronos.it@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] atl1: disable 64bit DMA

On Mon, 25 Jun 2007 17:57:20 -0400
Chris Snook <csnook@...hat.com> wrote:

> Jay L. T. Cornwall wrote:
> > Chris Snook wrote:
> > 
> >> What boards have we seen this on?  It's quite possible this is:
> > 
> > I can reproduce on an Asus P5K with a Core 2 Duo E6600.
> > 
> > lspci identifies the controller as:
> >   02:00.0 Ethernet controller: Attansic Technology Corp. L1 Gigabit
> >   Ethernet Adapter (rev b0)
> > 
> > dmesg notes the PCI-DMA mapping implementation:
> >   PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
> > 
> 
> I had a hunch this was on Intel.  I'd rather just disable this when
> swiotlb is in use, unless we get more complaints.  It's probably
> ultimately a BIOS quirk anyway.

So far we have reports from both camps:

Asus M2N8-VMX (AM2):	1 report of lockup
http://sourceforge.net/mailarchive/forum.php?thread_name=46780384.063603.26165%40m12-15.163.com&forum_name=atl1-devel

Asus P5K (LGA775):	2 reports of lockups
http://sourceforge.net/mailarchive/forum.php?thread_name=467E7E34.4010603%40gmail.com&forum_name=atl1-devel
http://lkml.org/lkml/2007/6/25/107

The common denominator in these reports is 4GB RAM.
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