Bharath Ramesh wrote:
I using OFED-1.2 for my research project. I am facing an issue where
when I try to post IBV_WR_RDMA_WRITE work request to the QP
ibv_post_send returns with -1. This I presume means lack of resources
to complete the operation. To give a brief summary of my communication
mechanism, I have two kind of messages control messages and large
messages. I post control messages with the normal IBV_WR_SEND with
send flags set to IBV_SEND_INLINE. Every few hundred such control
messages I set the send flag to IBV_SEND_INLINE | IBV_SEND_SIGNALED
and poll my send CQ. For large messages I use IBV_WR_RDMA_WRITE with
send flags set to IBV_SEND_SIGNALED. After posting any large message I
poll the send CQ for completion. I have sufficient buffers posted on
the receiver.
The first thing I did when I encountered this issue is to write a
small test which just does only IBV_WR_RDMA_WRITE similar to my
application. This test works fine without having any issues. I am
wondering what could be potential issues that might be causing such a
scenario of unavailable resources. Any help in debugging this
situation would be appreciated. I am not subscribed to the list would
appreciate if I am copied on the replies.
Hi.
ibv_post_send may fail if:
1) too many WR are outstanding on the SQ (maybe you posted too many WR
without polling for there completion)
2) bad WR was posted (for example: RDMA Write for UD QP).
3) maybe the size of the WR that you are trying to post as inline is too
big (upon QP creation you can see this size in the sq_send_inline)
Dotan
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