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HE1PR0501MB2042; 5: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; 24:qVxcyQMxizW+mmiJizKJMObl3d0DR++jaDAvifgMANA7WofxZbxJcxVUfJlBTUAyeVhljE/qd/LigJf7xd57ffkH/iQcRMw57WiO7oulR6Q= SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-Microsoft-Exchange-Diagnostics: 1; HE1PR0501MB2042; 7:SpIuXblGXk1d/P3L5igmZ8PMv0Yon3dSfy+c5ZKv9KtFJi/gglpaOoeXuEQxE4iw80XVdYNFnTfkovrlk0oKA8Mv4J/Z8O/cNu0eHzfRsFA+gb2REuaMCtMEWRszG4FmHBjL8kcqX/CEKVPDj5JuIzQ7QYTWAbhoZI/Ak9l3exaP7ydLS+/6SO2o+SLw8ycU0uUrf3Np461z4/+XkCfGG03UdBI+TntHMmufgfJK7Q3QnVNF3MYjWCM7Z8NlBMkHIkXPtAL6TwoMZfJRerjRabUnhvXZfB205gs0blBNQ6y9zGTN5HxZDJ9S7La8Sn2tKppwcdAGUOluMrNEKXSpVNlUhhIF52Pqhv0uhJSpSAtRrnID7ip5U421Z3YdYHVNtYY+8Spsv6wVmAS+4lHXjQMHORLCw0GuSqihEtJdQn3PDvGw1yA98wGR0TCsuwCZoQ3jaxwrJwaZiw9gWQxdUaltTYRF5fPtAS9KIpptOzP5w5VBjg8IFeNXuTApcJsbiosIhExkKwxlWpCmuIs1hPP0wS4iB2xd8VN+at43Sc0i9gB2jPr9FN7ROi5tC1cRzkhGkHJtteseEuReMhXd0i0O8thGrS1ZrNbeslVIUlaVIqNAWD9KoNCgSVotlhrplIMnu9+Xa+XRZ4V6a3ftWeEJ0tHUzxgAeeHxDFqw3mgKw5qOfkEYyH7lRAFL/XgI0pi8aRgU0DBWU9TKmQu8EnJELGg9bPZIiknMfFjbQxVs0Z+M6IPEN/xGxYgMFjExMjwJsS+u2yZgXFds4sYXK7Cx/q0IXrDsxZG7HtseqXI= X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jul 2017 15:48:47.3101 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0501MB2042 Subject: [dpdk-dev] [PATCH] net/mlx5: poll completion queue once per a call X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" mlx5_tx_complete() polls completion queue multiple times until it encounters an invalid entry. As Tx completions are suppressed by MLX5_TX_COMP_THRESH, it is waste of cycles to expect multiple completions in a poll. And freeing too many buffers in a call can cause high jitter. This patch improves throughput a little. Signed-off-by: Yongseok Koh Acked-by: Nelio Laranjeiro Reviewed-by: Sagi Grimberg Reviewed-by: Sagi Grimberg --- drivers/net/mlx5/mlx5_rxtx.h | 32 ++++++++++---------------------- 1 file changed, 10 insertions(+), 22 deletions(-) diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h index 534aaeb46..7fd59a4b1 100644 --- a/drivers/net/mlx5/mlx5_rxtx.h +++ b/drivers/net/mlx5/mlx5_rxtx.h @@ -480,30 +480,18 @@ mlx5_tx_complete(struct txq *txq) struct rte_mempool *pool = NULL; unsigned int blk_n = 0; - do { - volatile struct mlx5_cqe *tmp; - - tmp = &(*txq->cqes)[cq_ci & cqe_cnt]; - if (check_cqe(tmp, cqe_n, cq_ci)) - break; - cqe = tmp; + cqe = &(*txq->cqes)[cq_ci & cqe_cnt]; + if (unlikely(check_cqe(cqe, cqe_n, cq_ci))) + return; #ifndef NDEBUG - if (MLX5_CQE_FORMAT(cqe->op_own) == MLX5_COMPRESSED) { - if (!check_cqe_seen(cqe)) - ERROR("unexpected compressed CQE, TX stopped"); - return; - } - if ((MLX5_CQE_OPCODE(cqe->op_own) == MLX5_CQE_RESP_ERR) || - (MLX5_CQE_OPCODE(cqe->op_own) == MLX5_CQE_REQ_ERR)) { - if (!check_cqe_seen(cqe)) - ERROR("unexpected error CQE, TX stopped"); - return; - } -#endif /* NDEBUG */ - ++cq_ci; - } while (1); - if (unlikely(cqe == NULL)) + if ((MLX5_CQE_OPCODE(cqe->op_own) == MLX5_CQE_RESP_ERR) || + (MLX5_CQE_OPCODE(cqe->op_own) == MLX5_CQE_REQ_ERR)) { + if (!check_cqe_seen(cqe)) + ERROR("unexpected error CQE, TX stopped"); return; + } +#endif /* NDEBUG */ + ++cq_ci; txq->wqe_pi = ntohs(cqe->wqe_counter); ctrl = (volatile struct mlx5_wqe_ctrl *) tx_mlx5_wqe(txq, txq->wqe_pi);