> -----Original Message-----
> From: Woodruff, Robert J [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, January 05, 2005 3:53 PM
> To: Diego Crupnicoff; Hal Rosenstock; Peter Buckingham
> Cc: [email protected]
> Subject: RE: [openib-general] ip over ib throughtput
>
>
> The trade off is that a fully connected model requires each
> node to burn a QP for every node in the cluster and thus does
> not scale as well as the UD model. My guess is that if
> people need really high performance
> socket access, they will use SDP instead.
>
> woody
>
1 QP for every node in the cluster does not sound that bad.
SDP is a good alternative too. It has even further benefits as compared to IPoIB (built in HW reliability that eliminates the TCP/IP stack, potential for zero copy, etc). However, in terms of QP requirements, SDP would consume even more than what a connected mode IPoIB would (still not too bad given the IB HW capabilities).
Diego
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