[openib-general] [PATCH v2 1/2] iWARP Connection Manager.
swise at opengridcomputing.com
Tue Jun 13 14:46:36 PDT 2006
On Tue, 2006-06-13 at 14:36 -0700, Sean Hefty wrote:
> >> Er...no. It will lose this event. Depending on the event...the carnage
> >> varies. We'll take a look at this.
> >This behavior is consistent with the Infiniband CM (see
> >drivers/infiniband/core/cm.c function cm_recv_handler()). But I think
> >we should at least log an error because a lost event will usually stall
> >the rdma connection.
> I believe that there's a difference here. For the Infiniband CM, an allocation
> error behaves the same as if the received MAD were lost or dropped. Since MADs
> are unreliable anyway, it's not so much that an IB CM event gets lost, as it
> doesn't ever occur. A remote CM should retry the send, which hopefully allows
> the connection to make forward progress.
hmm. Ok. I see. I misunderstood the code in cm_recv_handler().
Tom and I have been talking about what we can do to not drop the event.
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