[dpdk-dev] [PATCH] app/testpmd: add packet data prefetch in macswap loop

[Jerin Jacob]

prefetch the next packet data address in advance in macswap loop
for performance improvement.

Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
 app/test-pmd/macswap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c
index 154889d..c10f4b5 100644
--- a/app/test-pmd/macswap.c
+++ b/app/test-pmd/macswap.c
@@ -113,6 +113,9 @@ pkt_burst_mac_swap(struct fwd_stream *fs)
 	if (txp->tx_ol_flags & TESTPMD_TX_OFFLOAD_INSERT_QINQ)
 		ol_flags |= PKT_TX_QINQ_PKT;
 	for (i = 0; i < nb_rx; i++) {
+		if (likely(i < nb_rx - 1))
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
+						       void *));
 		mb = pkts_burst[i];
 		eth_hdr = rte_pktmbuf_mtod(mb, struct ether_hdr *);
 
-- 
2.1.0