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Re: Mystery packet killing tg3

To: Andi Kleen <ak@xxxxxx>
Subject: Re: Mystery packet killing tg3
From: Stephen Hemminger <shemminger@xxxxxxxx>
Date: Thu, 05 May 2005 09:20:25 -0700
Cc: Peter Buckingham <peter@xxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, jgarzik@xxxxxxxxx, netdev@xxxxxxxxxxx
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Andi Kleen wrote:

>>>IOMMU code on x86-64 should be never active unless Stephen
>>>used IOMMU_DEBUG or iommu=force.  THat is because the tg3
>>>is a 64bit capable device and should always use bypass.
>>how is this detected? we have a board that is using a 32bit e1000 and we 
>>have to use iommu=force otherwise it doesn't do the right thing with > 
>>4GB of RAM.
>"32bit e1000"? How did you get such a beast? AFAIK all e1000s are 64bit
>address capable. Please supply a full boot log without iommu=force 
>and describe what happens exactly.
One of the osdl e1000's in the lab is an IBM rebranded card that although
it uses a 64bit slot, is really only 32bit

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