[openib-general] ip over ib throughtput

[Diego Crupnicoff]

> -----Original Message-----
> From: Woodruff, Robert J [mailto:robert.j.woodruff at intel.com] 
> Sent: Wednesday, January 05, 2005 3:53 PM
> To: Diego Crupnicoff; Hal Rosenstock; Peter Buckingham
> Cc: openib-general at openib.org
> 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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