[openib-general] RMPP implementation

[Fab Tillier]

> From: Sean Hefty [mailto:mshefty at ichips.intel.com]
> Sent: Tuesday, November 16, 2004 5:07 PM
> 
> I'm starting work on the RMPP implementation in the MAD code.  If anyone
> has any ideas/preferences on the implementation, please let me know.
> 
> For the send side, there are a couple of ways to perform the segmentation:
> 
> 1.  Issue one send at a time.  Additional sends are not transfered until
>   the first send completes.
> 2.  Issue multiple sends using 2 data segments per request.  This
> requires allocating and mapping space (36 bytes) for copying the MAD
> common and RMPP headers.
> 3.  Issue multiple sends using 3 data segments per request.  This is the
> same as #2, but only copes the RMPP header.
> 
> I'm leaning towards #2 at this point.
> 

Isn't #1 the simplest to implement?  Turnaround on the send queue should be
pretty quick, so send performance should be fine.  I say do whatever is
simplest, and then optimize from there, and to me that means #1 at the
moment.  What are the reasons to *not* do #1?

- Fab