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These statistics can help to estimate efficiency of Work Requests batching and show busy/idle polls ratio. Send: the doorbell updates statistics for verbs provider are incremented per each ibv_post_send call, for mlx5_dv per each ibv_wr_complete call. Recv: the doorbell updates statistics for both providers are updated when either ibv_post_recv or ibv_post_srq_recv functions are called. Each qpair on initialization accepts an optional pointer to shared statistics (nvmf/nvme poll groups). If the pointer to statistics is not provided then qpair allocates its own structure. That is done to support cases when NVME RDMA initiator doesn't use poll groups, so we can avoid checks that qpair has statistics in IO path Change-Id: I07dea603cb870b85ea23c42e8e2c4520b1c66252 Signed-off-by: Alexey Marchuk <alexeymar@mellanox.com> Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6293 Community-CI: Broadcom CI Community-CI: Mellanox Build Bot Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> |
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