1 Reply Latest reply on May 26, 2017 1:57 AM by breuner

    How to use Doorbell or RDMA Write with Immediate for data communication between two servers?


      Hello Mellanox Support,


      I have a task to write a data communication code , to send data from server A to server B, through IB (connextc-3 PRO). After data is sent from Server A to Server B, a notification should be sent to Server B, such that Server B can proceed to process/consume the data.

      I plan to use door bell for this notification as I think the doorbell could consumes less CPU cycles at the Server B side.

      Do you have any example code/sample code to use doorbell along with the IB programming?  I have studied about perftest(ib_write, ib_test) code, but there is no such example for doorbell.


      Can I also use RDMA Write with Immediate feature for this? Any sample code for this? what is the verb I should set to use RDMA Write with Immediate?


      I also looked at the rdma_get_recv_comp() code in rdma_server/client.c example. as per manual, rdma_get_recv_comp() is blocking, does this "blocking" refer to block on CPU, or block on that specific CQ channels(but I can still use other CQ for data communication)?


      Thank you.

      Mei Guodong