Hey there, I have a fairly complex system that I've built over the last few years as part of my PhD that uses reliable connections for message-passing and RDMA. After reading a recent paper, I decided to compare the performance of message-passing over unreliable connections for the sake of completeness, but unfortunately, I've repeatedly run into obstacles trying to switch to using the UC mode. I even wrote a tiny client and server that simply opens a connection, sends a message, and sends a response, and when I switch from RC to UC, the rdma_accept() at the server always fails with EINVAL when trying to accept the client's rdma_connect(). I'm afraid documentation, source code, and experimentation have left me stymied. I have tried using RDMA_PS_IB and RDMA_PS_UDP instead of RDMA_PS_TCP in rdma_create_id() to no avail, I've experimented with qp_attr fields, and my MWE shows the same problems as the larger system. Any assistance woudl be greatly appreciated, and I'd be happy to provide more details about my setup of the event channel, queue pair, buffers, and so on if necessary. Cheers, Christopher -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
