> Thanks for the quick response. I've made the suggested changes, but
> I'm afraid I am having the same problems. In fact, I see that a
> previous thread (
> http://www.spinics.net/lists/linux-rdma/msg07573.html ) follows
> another user with the same problem. In fact, I finally found a message
> (from you, actually!
> http://www.spinics.net/lists/linux-rdma/msg07601.html ) saying that as
> of 2011, librdmacm can't handle UC. Is this still the case?
UC support has never been a priority, so it's not something that's tested. I
modified one of the example librdmacm programs to use UC, and it seemed to
work. At least it made a connection and transferred some data. I did not
verify that UC was actually being used.
A newer kernel may be needed, but I don't remember what patches are required or
which version the changes went upstream. Changes were never made specifically
to support UC, but the changes to support XRC and native IB addressing should
have made it possible.
Btw, is there any reason why you're wanting to run over UC? It kind of
combines the worst part of UD with the worst features of RC -- kind of the el
Camino of protocols.
- Sean
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