[ofa-general] Re: IPOIB CM (NOSRQ)[PATCH V3] patch for review

[Pradeep Satyanarayana]

general-bounces at lists.openfabrics.org wrote on 05/03/2007 01:30:00 PM:

>  > Current ehca surely supports UC. Just give ibv_uc_pingpong a try.
> 
> Thanks... in that case I would definitely suggest investigating using
> UC for IPoIB connected mode when SRQs are not available.
> 
> In fact assuming the IBA work to add the ability to attach UC QPs to
> SRQs is completed, I think we would probably want to move IPoIB CM to
> using UC exclusively.

Then in the interim, how do we address the interoperability issue between 
say
for example, Topspin and IBM HCAs using connected mode -switch to datagram 
mode? 

This discussion started from using non zero retry count -that is still 
easily
solvable by patching CM and/or drivers and resetting the retry_count back 
to 0.

Switching to datagram mode will result in too big a performance drop. I am 
not
inclined to go in that direction.

Pradeep
pradeep at us.ibm.com