vhost: prefetch available ring

[dpdk.git] / lib / librte_vhost / virtio_net.c

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index b4a0760313e59a5bda799556e446f65a469a13fa..8f2ade1dfd7661c7d1982fbc3b7f3bc7a4e6f5ee 100644 (file)
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -536,6 +536,8 @@ 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;