app/testpmd: fix missing prefetch in macswap mode

Prefetching packet was missing when do_macswap() was optimized.

Fixes: 62b52877adbe ("app/testpmd: batch MAC swap for performance on x86")

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>

diff --git a/app/test-pmd/macswap_sse.h b/app/test-pmd/macswap_sse.h
index 662fe79..2b6e732 100644 (file)
--- a/app/test-pmd/macswap_sse.h
+++ b/app/test-pmd/macswap_sse.h
@@ -35,6 +35,13 @@ do_macswap(struct rte_mbuf *pkts[], uint16_t nb,
        r = nb;
 
        while (r >= 4) {
+               if (r >= 8) {
+                       rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 4], void *));
+                       rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 5], void *));
+                       rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 6], void *));
+                       rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 7], void *));
+               }
+
                mb[0] = pkts[i++];
                eth_hdr[0] = rte_pktmbuf_mtod(mb[0], struct ether_hdr *);
                addr0 = _mm_loadu_si128((__m128i *)eth_hdr[0]);