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3977026462
The problem was that node A's sending thread, which handles sending RDMA read response data, would write the trigger word, the last packet would be sent, node B would send a new RDMA read request, node A's interrupt handler would initialize s_rdma_sge, then node A's sending thread would update s_rdma_sge. This didn't happen very often naturally but was more frequent with 1 byte RDMA reads. Rather than adding more locking or increasing the QP structure size and copying sge data, I modified the copy routine to update the pointers before writing the trigger word to avoid the update race. Signed-off-by: Ralph Campbell <ralphc@pathscale.com> Signed-off-by: Bryan O'Sullivan <bos@pathscale.com> Signed-off-by: Roland Dreier <rolandd@cisco.com> |
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