From 3dc4a4d7e9c258391cb2075043ee19fa114908f2 Mon Sep 17 00:00:00 2001 From: Radu Nicolau Date: Fri, 9 Apr 2021 10:09:03 +0000 Subject: [PATCH] net/ice: use write combining store for tail on AVX512 Performance improvement: use a write combining store instead of a regular mmio write to update queue tail registers. Signed-off-by: Radu Nicolau Acked-by: Qi Zhang --- drivers/net/ice/ice_rxtx_vec_avx512.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ice/ice_rxtx_vec_avx512.c b/drivers/net/ice/ice_rxtx_vec_avx512.c index 835d0aa703..0a3e8da024 100644 --- a/drivers/net/ice/ice_rxtx_vec_avx512.c +++ b/drivers/net/ice/ice_rxtx_vec_avx512.c @@ -125,7 +125,7 @@ ice_rxq_rearm(struct ice_rx_queue *rxq) (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1)); /* Update the tail pointer on the NIC */ - ICE_PCI_REG_WRITE(rxq->qrx_tail, rx_id); + ICE_PCI_REG_WC_WRITE(rxq->qrx_tail, rx_id); } static inline __m256i @@ -1111,7 +1111,7 @@ ice_xmit_fixed_burst_vec_avx512(void *tx_queue, struct rte_mbuf **tx_pkts, txq->tx_tail = tx_id; - ICE_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail); + ICE_PCI_REG_WC_WRITE(txq->qtx_tail, txq->tx_tail); return nb_pkts; } -- 2.20.1