[openib-general] IB: I don't like what I'm seeing.

Wed Mar 31 10:54:23 PST 2004

At 12:46 PM 3/31/2004, Hefty, Sean wrote:
>That said, Infiniband is a complex architecture that requires a fair
>amount of code to perform even "simple" non-connection based unreliable
>datagram communication.  A communication manager would still be needed
>for UD queue pairs for service ID resolution. 

Another way of saying this is that Infiniband places only a limited
amount of its support in hardware. Therefore, for architectural
reasons, it implements its complexity in software. As others have
pointed out, this is appropriate, given the return by the fast-path
of the hardware.

I would agree that a withdrawal to UD is not very useful, given that
it probably doesn't remove much, and also that most applications
expect RC-style service. If only IPoIB were in scope that would be
logical, however.

Tom.

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