From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by dpdk.org (Postfix) with ESMTP id C774A5B3A for ; Mon, 30 Jul 2018 18:16:28 +0200 (CEST) Received: from 1.general.paelzer.uk.vpn ([10.172.196.172] helo=lap.fritz.box) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1fkApp-00009D-DP; Mon, 30 Jul 2018 16:15:49 +0000 From: Christian Ehrhardt To: Yongseok Koh Cc: Shahaf Shuler , dpdk stable Date: Mon, 30 Jul 2018 18:11:41 +0200 Message-Id: <20180730161342.16566-56-christian.ehrhardt@canonical.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180730161342.16566-1-christian.ehrhardt@canonical.com> References: <20180730161342.16566-1-christian.ehrhardt@canonical.com> Subject: [dpdk-stable] patch 'net/mlx5: fix Rx buffer replenishment threshold' has been queued to stable release 18.05.1 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Jul 2018 16:16:28 -0000 Hi, FYI, your patch has been queued to stable release 18.05.1 Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet. It will be pushed if I get no objections before 08/01/18. So please shout if anyone has objections. Thanks. Christian Ehrhardt --- >>From e839cc451f8f0fcd02926c2189aa5e942934216a Mon Sep 17 00:00:00 2001 From: Yongseok Koh Date: Tue, 26 Jun 2018 04:33:35 -0700 Subject: [PATCH] net/mlx5: fix Rx buffer replenishment threshold [ upstream commit e10245a13b2e340f48ce80484f19bcbc13e9ebe6 ] The threshold of buffer replenishment for vectorized Rx burst is a constant value (64). If the size of Rx queue is comparatively small, device could run out of buffers. For example, if the size of Rx queue is 128, buffers are replenished only twice per a wraparound. This can cause jitter in receiving packets and the jitter can cause unnecessary retransmission for TCP connections. Fixes: 6cb559d67b83 ("net/mlx5: add vectorized Rx/Tx burst for x86") Fixes: 570acdb1da8a ("net/mlx5: add vectorized Rx/Tx burst for ARM") Signed-off-by: Yongseok Koh Acked-by: Shahaf Shuler --- drivers/net/mlx5/mlx5_defs.h | 5 +++-- drivers/net/mlx5/mlx5_rxtx_vec.h | 4 ++-- drivers/net/mlx5/mlx5_rxtx_vec_neon.h | 2 +- drivers/net/mlx5/mlx5_rxtx_vec_sse.h | 2 +- 4 files changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h index 51124cdcc..b52f7dcbe 100644 --- a/drivers/net/mlx5/mlx5_defs.h +++ b/drivers/net/mlx5/mlx5_defs.h @@ -64,10 +64,11 @@ #define MLX5_VPMD_MIN_TXQS 4 /* Threshold of buffer replenishment for vectorized Rx. */ -#define MLX5_VPMD_RXQ_RPLNSH_THRESH 64U +#define MLX5_VPMD_RXQ_RPLNSH_THRESH(n) \ + (RTE_MIN(MLX5_VPMD_RX_MAX_BURST, (unsigned int)(n) >> 2)) /* Maximum size of burst for vectorized Rx. */ -#define MLX5_VPMD_RX_MAX_BURST MLX5_VPMD_RXQ_RPLNSH_THRESH +#define MLX5_VPMD_RX_MAX_BURST 64U /* * Maximum size of burst for vectorized Tx. This is related to the maximum size diff --git a/drivers/net/mlx5/mlx5_rxtx_vec.h b/drivers/net/mlx5/mlx5_rxtx_vec.h index 598dc7519..fb884f92f 100644 --- a/drivers/net/mlx5/mlx5_rxtx_vec.h +++ b/drivers/net/mlx5/mlx5_rxtx_vec.h @@ -91,9 +91,9 @@ mlx5_rx_replenish_bulk_mbuf(struct mlx5_rxq_data *rxq, uint16_t n) &((volatile struct mlx5_wqe_data_seg *)rxq->wqes)[elts_idx]; unsigned int i; - assert(n >= MLX5_VPMD_RXQ_RPLNSH_THRESH); + assert(n >= MLX5_VPMD_RXQ_RPLNSH_THRESH(q_n)); assert(n <= (uint16_t)(q_n - (rxq->rq_ci - rxq->rq_pi))); - assert(MLX5_VPMD_RXQ_RPLNSH_THRESH > MLX5_VPMD_DESCS_PER_LOOP); + assert(MLX5_VPMD_RXQ_RPLNSH_THRESH(q_n) > MLX5_VPMD_DESCS_PER_LOOP); /* Not to cross queue end. */ n = RTE_MIN(n - MLX5_VPMD_DESCS_PER_LOOP, q_n - elts_idx); if (rte_mempool_get_bulk(rxq->mp, (void *)elts, n) < 0) { diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h index 71a5eaf23..3ebf34823 100644 --- a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h +++ b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h @@ -739,7 +739,7 @@ rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n, * N - (rq_ci - rq_pi) := # of buffers consumed (to be replenished). */ repl_n = q_n - (rxq->rq_ci - rxq->rq_pi); - if (repl_n >= MLX5_VPMD_RXQ_RPLNSH_THRESH) + if (repl_n >= MLX5_VPMD_RXQ_RPLNSH_THRESH(q_n)) mlx5_rx_replenish_bulk_mbuf(rxq, repl_n); /* See if there're unreturned mbufs from compressed CQE. */ rcvd_pkt = rxq->cq_ci - rxq->rq_pi; diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h index 3e985d61d..f0d888831 100644 --- a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h +++ b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h @@ -724,7 +724,7 @@ rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n, * N - (rq_ci - rq_pi) := # of buffers consumed (to be replenished). */ repl_n = q_n - (rxq->rq_ci - rxq->rq_pi); - if (repl_n >= MLX5_VPMD_RXQ_RPLNSH_THRESH) + if (repl_n >= MLX5_VPMD_RXQ_RPLNSH_THRESH(q_n)) mlx5_rx_replenish_bulk_mbuf(rxq, repl_n); /* See if there're unreturned mbufs from compressed CQE. */ rcvd_pkt = rxq->cq_ci - rxq->rq_pi; -- 2.17.1