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From: Balazs Nemeth <bnemeth@redhat.com>
To: bnemeth@redhat.com, dev@dpdk.org
Cc: dsinghrawat@marvell.com, rmody@marvell.com,
	jerinjacobk@gmail.com, irusskikh@marvell.com
Subject: [dpdk-dev] [PATCH v2 6/7] net/qede: prefetch next packet to free
Date: Fri, 26 Mar 2021 12:01:29 +0100
Message-ID: <0451d740c7207319f7aa09d9f73adefdee9efd4c.1616754844.git.bnemeth@redhat.com> (raw)
In-Reply-To: <cover.1616754844.git.bnemeth@redhat.com>

While handling the current mbuf, pull the next mbuf into the cache. Note
that the last four mbufs pulled into the cache are not handled, but that
doesn't matter.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
Reviewed-by: Igor Russkikh <irusskikh@marvell.com>
---
 drivers/net/qede/qede_rxtx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index 4f58abfbf..ed3617160 100644
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -917,6 +917,12 @@ qede_process_tx_compl(__rte_unused struct ecore_dev *edev,
 		nb_segs = mbuf->nb_segs;
 		remaining -= nb_segs;
 
+		/* Prefetch the next mbuf. Note that at least the last 4 mbufs
+		 * that are prefetched will not be used in the current call.
+		 */
+		rte_mbuf_prefetch_part1(txq->sw_tx_ring[(idx + 4) & mask]);
+		rte_mbuf_prefetch_part2(txq->sw_tx_ring[(idx + 4) & mask]);
+
 		PMD_TX_LOG(DEBUG, txq, "nb_segs to free %u\n", nb_segs);
 
 		while (nb_segs) {
-- 
2.30.2


  parent reply	other threads:[~2021-03-26 11:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 11:01 [dpdk-dev] [PATCH v2 0/7] Optimize qede use of Rx/Tx entries Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 1/7] net/qede: remove flags from Tx entry Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 2/7] net/qede: get consumer index once Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 3/7] net/qede: assume mbuf to free is never null Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 4/7] net/qede: free packets in bulk instead of one by one Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 5/7] net/qede: prefetch hardware consumer Balazs Nemeth
2021-03-26 11:01 ` Balazs Nemeth [this message]
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 7/7] net/qede: remove unnecessary field in Rx entry and simplify Balazs Nemeth
2021-03-27 14:02 ` [dpdk-dev] [PATCH v2 0/7] Optimize qede use of Rx/Tx entries Jerin Jacob

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