[Beowulf] Cheap SDR IB

[Mark Hahn]

>> If I had just 2 fat nodes could I connect the HCAs directly to each other 
>> and avoid the switch costs? 
>
> Yes.  With 3 nodes it might be cheaper having 2 HCA per node, 6 cables,
> than the switch solution.

with 3 nodes, each with a two ports,
wouldn't you need just 3 cables?

how is routing controlled in switchless configs? 
does IB have node-level forwarding?
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