[openib-general] IB mcast question

[Roland Dreier]

    Steve> However, if I run 2 instances of the app that reads mcasts
    Steve> and dumps them to stdout, I only get the mcast packets
    Steve> delivered to one of the applications.  Namely the first one
    Steve> who joins the group seems to get the mcasts.  I know for
    Steve> UDP/IP multicast, all applications bound to the same port
    Steve> and joined to the IP mcast addr will get a copy of incoming
    Steve> mcast packets.  Is this not true for IB mcast?  It appears
    Steve> not based on my tests...

This should work -- multicast packets should be replicated to all
attached UD QPs.  There is likely a bug in the librdma multicast support.

 - R.