[dpdk-dev] [PATCH v2 4/4] vhost: remove useless prefetch for packed ring descriptor

Maxime Coquelin maxime.coquelin at redhat.com
Wed Dec 19 09:21:13 CET 2018


This prefetch does not show any performance improvement.

Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/librte_vhost/virtio_net.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index a9be633de..4d201a3fd 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;
 
-- 
2.17.2



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