Manually prefetch the first desc in dequeue path.
Signed-off-by: Tiwei Bie <[email protected]>
---
lib/librte_vhost/virtio_net.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 0888d2b..08d53d9 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1259,6 +1259,7 @@ vhost_dequeue_burst_1_1(struct virtio_net *dev, struct
vhost_virtqueue *vq,
vq->last_used_idx = desc_idx;
if (likely(i)) {
+ rte_prefetch0(&desc[head_idx & (vq->size - 1)]);
for (desc_idx = head_idx + 1;
desc_idx != vq->last_used_idx;
desc_idx++) {
--
2.7.4
