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

[Yuanhan Liu]

Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
Signed-off-by: Zhihong Wang <zhihong.wang at intel.com>
---
 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 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;
-- 
1.9.0