Roland Dreier wrote:
> > You don't know the time that the transition occurred, except that it
> > is between when you called modify QP and when it returned. But an
> > asynchronous event doesn't really help, does it?
> It does help. APM is not only defined for network fault tolerance, it can
> also be used for load-balancing. With this event, one can know when
> the path is loaded and it is safe to call modify_qp.
I guess I don't really understand how you're using this event. What
advantage is there in getting an async event at some unknown time
(maybe before the modify QP operation returns, maybe after)? What
does it let you do that you can't do with the verbs architecture as
defined strictly by the verbs?
Roland is right, this event wasn't defined in the IB spec.
If you wish to know when it is safe to call the modify_qp verb you can
call query_qp and check the
path_mig_state: it the state is ARMED, it means that it is safe to use
the alternate path.
Dotan
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