diff --git a/virtio-net-update-the-default-and-max-of-rx-tx_queue.patch b/virtio-net-update-the-default-and-max-of-rx-tx_queue.patch
new file mode 100644
index 0000000..0d849f9
--- /dev/null
+++ b/virtio-net-update-the-default-and-max-of-rx-tx_queue.patch
@@ -0,0 +1,104 @@
+From 88dfb4236c735c608f8ca91cfbfb5ac424d654aa Mon Sep 17 00:00:00 2001
+From: Jinhua Cao <caojinhua1@huawei.com>
+Date: Thu, 10 Feb 2022 17:28:49 +0800
+Subject: [PATCH] virtio-net: update the default and max of rx/tx_queue_size
+
+Set the max of tx_queue_size to 4096 even if the backends
+are not vhost-user.
+
+Set the default of rx/tx_queue_size to 2048 if the backends
+are vhost-user, otherwise to 4096.
+
+Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
+---
+ hw/net/virtio-net.c | 41 +++++++++++++++++++++++++++++++----------
+ 1 file changed, 31 insertions(+), 10 deletions(-)
+
+diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
+index 009dc9f3d1..e887589a30 100644
+--- a/hw/net/virtio-net.c
++++ b/hw/net/virtio-net.c
+@@ -51,12 +51,11 @@
+ #define MAX_VLAN    (1 << 12)   /* Per 802.1Q definition */
+ 
+ /* previously fixed value */
+-#define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
+-#define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256
++#define VIRTIO_NET_VHOST_USER_DEFAULT_SIZE 2048
+ 
+ /* for now, only allow larger queue_pairs; with virtio-1, guest can downsize */
+-#define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
+-#define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
++#define VIRTIO_NET_RX_QUEUE_MIN_SIZE 256
++#define VIRTIO_NET_TX_QUEUE_MIN_SIZE 256
+ 
+ #define VIRTIO_NET_IP4_ADDR_SIZE   8        /* ipv4 saddr + daddr */
+ 
+@@ -622,6 +621,28 @@ static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
+     }
+ }
+ 
++static void virtio_net_set_default_queue_size(VirtIONet *n)
++{
++    NetClientState *peer = n->nic_conf.peers.ncs[0];
++
++    /* Default value is 0 if not set */
++    if (n->net_conf.rx_queue_size == 0) {
++        if (peer && peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
++            n->net_conf.rx_queue_size = VIRTIO_NET_VHOST_USER_DEFAULT_SIZE;
++        } else {
++            n->net_conf.rx_queue_size = VIRTIO_NET_VQ_MAX_SIZE;
++        }
++    }
++
++    if (n->net_conf.tx_queue_size == 0) {
++        if (peer && peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
++            n->net_conf.tx_queue_size = VIRTIO_NET_VHOST_USER_DEFAULT_SIZE;
++        } else {
++            n->net_conf.tx_queue_size = VIRTIO_NET_VQ_MAX_SIZE;
++        }
++    }
++}
++
+ static int virtio_net_max_tx_queue_size(VirtIONet *n)
+ {
+     NetClientState *peer = n->nic_conf.peers.ncs[0];
+@@ -630,11 +651,11 @@ static int virtio_net_max_tx_queue_size(VirtIONet *n)
+      * Backends other than vhost-user don't support max queue size.
+      */
+     if (!peer) {
+-        return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
++        return VIRTIO_NET_VQ_MAX_SIZE;
+     }
+ 
+     if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
+-        return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
++        return VIRTIO_NET_VQ_MAX_SIZE;
+     }
+ 
+     return VIRTIO_NET_VQ_MAX_SIZE;
+@@ -3388,6 +3409,8 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
+     virtio_net_set_config_size(n, n->host_features);
+     virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
+ 
++    virtio_net_set_default_queue_size(n);
++
+     /*
+      * We set a lower limit on RX queue size to what it always was.
+      * Guests that want a smaller ring can always resize it without
+@@ -3679,10 +3702,8 @@ static Property virtio_net_properties[] = {
+                        TX_TIMER_INTERVAL),
+     DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
+     DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
+-    DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
+-                       VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
+-    DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
+-                       VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
++    DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 0),
++    DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, 0),
+     DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
+     DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
+                      true),
+-- 
+2.27.0
+