[openib-general] [ANNOUNCE] ContributeRDS(ReliableDatagramSockets) to OpenIB

[Caitlin Bestler]

> -----Original Message-----
> From: Woodruff, Robert J [mailto:robert.j.woodruff at intel.com] 
> Sent: Friday, November 04, 2005 1:10 PM
> To: Ranjit Pandit
> Cc: Caitlin Bestler; Fab Tillier; Sean Hefty; Rick Frank; 
> Matt L. Leininger; openib-general at openib.org
> Subject: RE: [openib-general] [ANNOUNCE] 
> ContributeRDS(ReliableDatagramSockets) to OpenIB
> 
> >To put the improvement in perspective:
> 
> And if RDS were implemented over a connectionless QP, the QP 
> savings are even more...
> 
> Procs per node   uDapl/Sdp   Rds/connection oriented
> RDS/conectionless
> 2                  19996            9999                      1    
> 4                  39984            9999                      1
> 
> Of coarse, connectionless would require the reliability to be 
> done in S/W in addition to the demuxing of packets. 
> 
> woody
> 
>

It would also require the application to do SAR for all
packets that are larger than the PMTU. One of the benefits
of trying to ride on the SOCK_DGRAM interface is that it
already defines a larger guaranteed message size.