Re: Mystery packet killing tg3

[Stephen Hemminger <shemminger@xxxxxxxx>]

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