From c1058a6b162d0e6d9210ae2c777825c2cf7b5c59 Mon Sep 17 00:00:00 2001 From: Maxime Coquelin Date: Fri, 6 Jul 2018 09:04:48 +0200 Subject: [PATCH] vhost: prefetch first descriptor in dequeue path Signed-off-by: Maxime Coquelin Acked-by: Tiwei Bie --- lib/librte_vhost/virtio_net.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index 2cfd8585c8..2662a1d324 100644 --- a/lib/librte_vhost/virtio_net.c +++ b/lib/librte_vhost/virtio_net.c @@ -1083,6 +1083,8 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id, vq->shadow_used_idx = 0; } + rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); + /* * Construct a RARP broadcast packet, and inject it to the "pkts" * array, to looks like that guest actually send such packet. -- 2.20.1