netdev - Re: [PATCH] atl1: disable 64bit DMA

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Message-ID: <46803A40.4070009@redhat.com>
Date:	Mon, 25 Jun 2007 17:57:20 -0400
From:	Chris Snook <csnook@...hat.com>
To:	"Jay L. T. Cornwall" <jay@...na.co.uk>
CC:	Luca Tettamanti <kronos.it@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	Jay Cliburn <jacliburn@...lsouth.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] atl1: disable 64bit DMA

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.

	-- Chris
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