diff mbox

[dpdk-dev,v7,6/7] vhost: prefetch avail ring

Message ID 1476437678-7102-7-git-send-email-yuanhan.liu@linux.intel.com (mailing list archive)
State Accepted, archived
Delegated to: Yuanhan Liu
Headers

Commit Message

Yuanhan Liu Oct. 14, 2016, 9:34 a.m. UTC 
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>
---
 lib/librte_vhost/virtio_net.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox

Patch

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 2bdc2fe..12a037b 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -539,6 +539,8 @@  virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
 	if (count == 0)
 		return 0;
 
+	rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
+
 	vq->shadow_used_idx = 0;
 	for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
 		uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;