From: Maxime Coquelin <maxime.coquelin@redhat.com>
Date: Wed, 19 Dec 2018 08:21:13 +0000 (+0100)
Subject: vhost: remove useless prefetch for packed ring descriptor
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=815814c4ff67572e3f3b46ae584e032474eeda4f;p=dpdk.git

vhost: remove useless prefetch for packed ring descriptor

This prefetch does not show any performance improvement.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Tiwei Bie <tiwei.bie@intel.com>
---

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index a9be633deb..4d201a3fd2 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1437,8 +1437,6 @@ virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 {
 	uint16_t i;
 
-	rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
-
 	if (unlikely(dev->dequeue_zero_copy)) {
 		struct zcopy_mbuf *zmbuf, *next;