[openib-general] [ANNOUNCE] Contribute RDS ( ReliableDatagramSockets) to OpenIB

[Michael Krause]

At 10:48 AM 11/10/2005, Caitlin Bestler wrote:
>
>
>
>Mike Krause wrote in response to Greg Lindahl:
>
>
> >       If it is to be reasonably robust, then RDS should be required to
>support
> > the resync between the two sides of the communication.  This aligns
>with the
> > stated objective of implementing reliability in one location in
>software and
> > one location in hardware.  Without such resync being required in the
>ULP,
> > then one ends up with a ULP that falls shorts of its stated objectives
>and
> > pushes complexity back up to the application which is where the
>advocates
> > have stated it is too complex or expensive to get it correct.
>
>
>I haven't reread all of RDS fine print to double-check this, but my
>impression is that RDS semantics exactly match the subset of MPI
>point-to-point communications where the receiving rank is required
>to have pre-posted buffers before the send is allowed.

My concern is the requirement that RDS resync the structures in the face of 
failure and know whether to re-transmit or will deal with 
duplicates.  Having pre-posted buffers will help enable the resync to be 
accomplished but should not be equated to pre-post equals one can deal with 
duplicates or will verify to prevent duplicates from occurring.

Mike 
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