netdev - Re: PROBLEM: tg3 spitting out uninitialized memory

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Date:	Mon, 16 Apr 2007 08:31:26 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Michael Chan <mchan@...adcom.com>
Cc:	Jamie webb <j@...bb.sygneca.com>, Andi Kleen <andi@...stfloor.org>,
	netdev@...r.kernel.org
Subject: Re: PROBLEM: tg3 spitting out uninitialized memory

> That's right.  See the discussion on a similar problem here:
> 
> <http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=10
> 59644&admit=-682735245+1158251313899+28353475>

That's an AMD machine.

> 
> In this other case, the symptoms were very similar to yours.
> I suspected it was an IOMMU problem, and the problem went
> away when the user upgraded to the latest kernel at that
> time.

tg3s never use the IOMMU on AMD systems with production kernels
because they have a suitably large DMA mask. IOMMU is only used
there to remap memory that doesn't fit a device's DMA mask.
There is a debugging mode to force iommu always, but it is not used 
unless you configure it specially.

-Andi
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