[ewg] user SA notifications, redux

[Mike Heinz]

By providing this mechanism, ib_usa provides a convenient and useful way for user applications to detect when nodes enter or leave the fabric. This is useful for fabric monitoring applications (like a system admin dashboard) or, conceivably, to allow a job scheduler to react to problems and to dynamically balance the computational load across the fabric.

As a reminder - the original proposal also supported allowing user applications to join multicast groups, but there was talk about adding that to rdma_cm, instead.

-----Original Message-----
From: Hefty, Sean [mailto:sean.hefty at intel.com] 
Sent: Wednesday, October 13, 2010 11:59 AM
To: Mike Heinz; linux-rdma at vger.kernel.org; ewg at openfabrics.org
Cc: vlad at mellanox.co.il; Roland Dreier
Subject: RE: user SA notifications, redux

> As I mentioned earlier, the reason ib_sa acts as a single access point for
> SA/SM traps and notices is because traps and notices are sent to ports, not
> to
> queue pairs and not to processes. That means only one entity can be
> subscribed
> for notices and traps at any particular time, and must manage them,
> "sharing
> them out" among all processes that are interested in them.

Can you provide a brief description of the intended usage model?