diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5810841..b450fc4 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -72,6 +72,8 @@ struct send_queue {
 
 	/* Name of the send queue: output.$index */
 	char name[40];
+
+	struct napi_struct napi;
 };
 
 /* Internal representation of a receive virtqueue */
@@ -217,15 +219,40 @@ static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
 	return p;
 }
 
+static int free_old_xmit_skbs(struct send_queue *sq, int budget)
+{
+	struct sk_buff *skb;
+	unsigned int len;
+	struct virtnet_info *vi = sq->vq->vdev->priv;
+	struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
+	int sent = 0;
+
+	while (sent < budget &&
+	       (skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
+		pr_debug("Sent skb %p\n", skb);
+
+		u64_stats_update_begin(&stats->tx_syncp);
+		stats->tx_bytes += skb->len;
+		stats->tx_packets++;
+		u64_stats_update_end(&stats->tx_syncp);
+
+		dev_kfree_skb_any(skb);
+		sent++;
+	}
+
+	return sent;
+}
+
 static void skb_xmit_done(struct virtqueue *vq)
 {
 	struct virtnet_info *vi = vq->vdev->priv;
+	struct send_queue *sq = &vi->sq[vq2txq(vq)];
 
-	/* Suppress further interrupts. */
-	virtqueue_disable_cb(vq);
-
-	/* We were probably waiting for more output buffers. */
-	netif_wake_subqueue(vi->dev, vq2txq(vq));
+	if (napi_schedule_prep(&sq->napi)) {
+		virtqueue_disable_cb(vq);
+		virtqueue_disable_cb_urgent(vq);
+		__napi_schedule(&sq->napi);
+	}
 }
 
 static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx)
@@ -772,7 +799,38 @@ again:
 	return received;
 }
 
+static int virtnet_poll_tx(struct napi_struct *napi, int budget)
+{
+	struct send_queue *sq =
+		container_of(napi, struct send_queue, napi);
+	struct virtnet_info *vi = sq->vq->vdev->priv;
+	struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq));
+	unsigned int r, sent = 0;
+
+again:
+	__netif_tx_lock(txq, smp_processor_id());
+	sent += free_old_xmit_skbs(sq, budget - sent);
+
+	if (sent < budget) {
+		r = virtqueue_enable_cb_prepare_urgent(sq->vq);
+		napi_complete(napi);
+		__netif_tx_unlock(txq);
+		if (unlikely(virtqueue_poll(sq->vq, r)) &&
+		    napi_schedule_prep(napi)) {
+			virtqueue_disable_cb_urgent(sq->vq);
+			__napi_schedule(napi);
+			goto again;
+		}
+	} else {
+		__netif_tx_unlock(txq);
+	}
+
+	netif_wake_subqueue(vi->dev, vq2txq(sq->vq));
+	return sent;
+}
+
 #ifdef CONFIG_NET_RX_BUSY_POLL
+
 /* must be called with local_bh_disable()d */
 static int virtnet_busy_poll(struct napi_struct *napi)
 {
@@ -820,31 +878,13 @@ static int virtnet_open(struct net_device *dev)
 			if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
 				schedule_delayed_work(&vi->refill, 0);
 		virtnet_napi_enable(&vi->rq[i]);
+		napi_enable(&vi->sq[i].napi);
 	}
 
 	return 0;
 }
 
-static void free_old_xmit_skbs(struct send_queue *sq)
-{
-	struct sk_buff *skb;
-	unsigned int len;
-	struct virtnet_info *vi = sq->vq->vdev->priv;
-	struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
-
-	while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
-		pr_debug("Sent skb %p\n", skb);
-
-		u64_stats_update_begin(&stats->tx_syncp);
-		stats->tx_bytes += skb->len;
-		stats->tx_packets++;
-		u64_stats_update_end(&stats->tx_syncp);
-
-		dev_kfree_skb_any(skb);
-	}
-}
-
-static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
+static int xmit_skb(struct send_queue *sq, struct sk_buff *skb, bool urgent)
 {
 	struct skb_vnet_hdr *hdr;
 	const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
@@ -908,7 +948,43 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
 		sg_set_buf(sq->sg, hdr, hdr_len);
 		num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
 	}
-	return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
+	if (urgent)
+		return virtqueue_add_outbuf_urgent(sq->vq, sq->sg, num_sg,
+						   skb, GFP_ATOMIC);
+	else
+		return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb,
+					    GFP_ATOMIC);
+}
+
+static bool virtnet_skb_needs_intr(struct sk_buff *skb)
+{
+	union {
+		unsigned char *network;
+		struct iphdr *ipv4;
+		struct ipv6hdr *ipv6;
+	} hdr;
+	struct tcphdr *th = tcp_hdr(skb);
+	u16 payload_len;
+
+	hdr.network = skb_network_header(skb);
+
+	/* Only IPv4/IPv6 with TCP is supported */
+	if ((skb->protocol == htons(ETH_P_IP)) &&
+	    hdr.ipv4->protocol == IPPROTO_TCP) {
+		payload_len = ntohs(hdr.ipv4->tot_len) - hdr.ipv4->ihl * 4 -
+			      th->doff * 4;
+	} else if ((skb->protocol == htons(ETH_P_IPV6) ||
+		   hdr.ipv6->nexthdr == IPPROTO_TCP)) {
+		payload_len = ntohs(hdr.ipv6->payload_len) - th->doff * 4;
+	} else {
+		return false;
+	}
+
+	/* We don't want to dealy packet with PUSH bit and pure ACK packet */
+	if (!th->psh && payload_len)
+		return true;
+
+	return false;
 }
 
 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
@@ -916,13 +992,15 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct virtnet_info *vi = netdev_priv(dev);
 	int qnum = skb_get_queue_mapping(skb);
 	struct send_queue *sq = &vi->sq[qnum];
-	int err;
+	bool urgent = virtnet_skb_needs_intr(skb);
+	int err, qsize = virtqueue_get_vring_size(sq->vq);
 
+	virtqueue_disable_cb_urgent(sq->vq);
 	/* Free up any pending old buffers before queueing new ones. */
-	free_old_xmit_skbs(sq);
+	free_old_xmit_skbs(sq, qsize);
 
 	/* Try to transmit */
-	err = xmit_skb(sq, skb);
+	err = xmit_skb(sq, skb, urgent);
 
 	/* This should not happen! */
 	if (unlikely(err)) {
@@ -935,22 +1013,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 		return NETDEV_TX_OK;
 	}
 
-	/* Don't wait up for transmitted skbs to be freed. */
-	skb_orphan(skb);
-	nf_reset(skb);
+	if (!urgent) {
+		skb_orphan(skb);
+		nf_reset(skb);
+	}
 
 	/* Apparently nice girls don't return TX_BUSY; stop the queue
 	 * before it gets out of hand.  Naturally, this wastes entries. */
 	if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
 		netif_stop_subqueue(dev, qnum);
+		virtqueue_disable_cb_urgent(sq->vq);
 		if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
 			/* More just got used, free them then recheck. */
-			free_old_xmit_skbs(sq);
+			free_old_xmit_skbs(sq, qsize);
 			if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
 				netif_start_subqueue(dev, qnum);
 				virtqueue_disable_cb(sq->vq);
 			}
 		}
+	} else if (virtqueue_enable_cb_urgent(sq->vq)) {
+		free_old_xmit_skbs(sq, qsize);
 	}
 
 	if (__netif_subqueue_stopped(dev, qnum) || !skb->xmit_more)
@@ -1132,8 +1214,10 @@ static int virtnet_close(struct net_device *dev)
 	/* Make sure refill_work doesn't re-enable napi! */
 	cancel_delayed_work_sync(&vi->refill);
 
-	for (i = 0; i < vi->max_queue_pairs; i++)
+	for (i = 0; i < vi->max_queue_pairs; i++) {
 		napi_disable(&vi->rq[i].napi);
+		napi_disable(&vi->sq[i].napi);
+	}
 
 	return 0;
 }
@@ -1452,8 +1536,10 @@ static void virtnet_free_queues(struct virtnet_info *vi)
 {
 	int i;
 
-	for (i = 0; i < vi->max_queue_pairs; i++)
+	for (i = 0; i < vi->max_queue_pairs; i++) {
 		netif_napi_del(&vi->rq[i].napi);
+		netif_napi_del(&vi->sq[i].napi);
+	}
 
 	kfree(vi->rq);
 	kfree(vi->sq);
@@ -1607,6 +1693,8 @@ static int virtnet_alloc_queues(struct virtnet_info *vi)
 		netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
 			       napi_weight);
 		napi_hash_add(&vi->rq[i].napi);
+		netif_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
+			       napi_weight);
 
 		sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
 		ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT);
@@ -1912,8 +2000,10 @@ static int virtnet_freeze(struct virtio_device *vdev)
 	if (netif_running(vi->dev)) {
 		for (i = 0; i < vi->max_queue_pairs; i++) {
 			napi_disable(&vi->rq[i].napi);
+			napi_disable(&vi->sq[i].napi);
 			napi_hash_del(&vi->rq[i].napi);
 			netif_napi_del(&vi->rq[i].napi);
+			netif_napi_del(&vi->sq[i].napi);
 		}
 	}
 
@@ -1938,8 +2028,10 @@ static int virtnet_restore(struct virtio_device *vdev)
 			if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
 				schedule_delayed_work(&vi->refill, 0);
 
-		for (i = 0; i < vi->max_queue_pairs; i++)
+		for (i = 0; i < vi->max_queue_pairs; i++) {
 			virtnet_napi_enable(&vi->rq[i]);
+			napi_enable(&vi->sq[i].napi);
+		}
 	}
 
 	netif_device_attach(vi->dev);
