diff --git a/test_plans/vm2vm_virtio_pmd_cbdma_test_plan.rst b/test_plans/vm2vm_virtio_pmd_cbdma_test_plan.rst
index a491bd40..d8fabe3f 100644
--- a/test_plans/vm2vm_virtio_pmd_cbdma_test_plan.rst
+++ b/test_plans/vm2vm_virtio_pmd_cbdma_test_plan.rst
@@ -1,5 +1,5 @@
 .. SPDX-License-Identifier: BSD-3-Clause
-   Copyright(c) 2022 Intel Corporation
+   Copyright(c) 2021 Intel Corporation
 
 ================================================
 vm2vm vhost-user/virtio-pmd with cbdma test plan
@@ -10,16 +10,16 @@ Description
 
 Vhost asynchronous data path leverages DMA devices to offload memory copies from the CPU and it is implemented in an asynchronous way.
 In addition, vhost supports M:N mapping between vrings and DMA virtual channels. Specifically, one vring can use multiple different DMA
-channels and one DMA channel can be shared by multiple vrings at the same time. Vhost enqueue operation with CBDMA channels is supported
-in both split and packed ring.
+channels and one DMA channel can be shared by multiple vrings at the same time. From DPDK22.07, Vhost enqueue and dequeue operation with
+CBDMA channels is supported in both split and packed ring.
 
-This document provides the test plan for testing some basic functions with CBDMA device in vm2vm vhost-user/virtio-pmd topology environment.
-1. vm2vm mergeable, normal path test with virtio 1.0 and virtio 1.1
-2. vm2vm mergeable path test with virtio 1.0 and dynamic change queue number.
+This document provides the test plan for testing some basic functions with CBDMA channels in vm2vm vhost-user/virtio-pmd topology environment.
+1. vm2vm mergeable, non-mergebale path test with virtio 1.0 and virtio1.1 and check virtio-pmd tx chain packets in mergeable path.
+2. dynamic change queue number.
 
-Note:
+..Note:
 1.For packed virtqueue virtio-net test, need qemu version > 4.2.0 and VM kernel version > 5.1, and packed ring multi-queues not support reconnect in qemu yet.
-2.For split virtqueue virtio-net with multi-queues server mode test, need qemu version >= 5.2.0, dut to old qemu exist reconnect issue when multi-queues test.
+2.For split virtqueue virtio-net with multi-queues server mode test, better to use qemu version >= 5.2.0, dut to qemu(v4.2.0~v5.1.0) exist split ring multi-queues reconnection issue.
 3.When DMA devices are bound to vfio driver, VA mode is the default and recommended. For PA mode, page by page mapping may
 exceed IOMMU's max capability, better to use 1G guest hugepage.
 4.DPDK local patch that about vhost pmd is needed when testing Vhost asynchronous data path with testpmd.
@@ -33,34 +33,34 @@ Prerequisites
 
 Topology
 --------
-      Test flow: Virtio-pmd-->Vhost-user-->Testpmd-->Vhost-user-->Virtio-pmd
+    Test flow: Virtio-pmd-->Vhost-user-->Testpmd-->Vhost-user-->Virtio-pmd
 
 Software
 --------
-      Trex:http://trex-tgn.cisco.com/trex/release/v2.26.tar.gz
+    Trex:http://trex-tgn.cisco.com/trex/release/v2.26.tar.gz
 
 General set up
 --------------
 1. Compile DPDK::
 
-      # CC=gcc meson --werror -Denable_kmods=True -Dlibdir=lib -Dexamples=all --default-library=<dpdk build dir>
-      # ninja -C <dpdk build dir> -j 110
-      For example:
-      CC=gcc meson --werror -Denable_kmods=True -Dlibdir=lib -Dexamples=all --default-library=x86_64-native-linuxapp-gcc
-      ninja -C x86_64-native-linuxapp-gcc -j 110
+    # CC=gcc meson --werror -Denable_kmods=True -Dlibdir=lib -Dexamples=all --default-library=static <dpdk build dir>
+    # ninja -C <dpdk build dir> -j 110
+    For example:
+    CC=gcc meson --werror -Denable_kmods=True -Dlibdir=lib -Dexamples=all --default-library=static x86_64-native-linuxapp-gcc
+    ninja -C x86_64-native-linuxapp-gcc -j 110
 
 2. Get the PCI device ID and DMA device ID of DUT, for example, 0000:18:00.0 is PCI device ID, 0000:00:04.0, 0000:00:04.1 is DMA device ID::
 
-      <dpdk dir># ./usertools/dpdk-devbind.py -s
+    <dpdk dir># ./usertools/dpdk-devbind.py -s
 
-      Network devices using kernel driver
-      ===================================
-      0000:18:00.0 'Device 159b' if=ens785f0 drv=ice unused=vfio-pci
+    Network devices using kernel driver
+    ===================================
+    0000:18:00.0 'Device 159b' if=ens785f0 drv=ice unused=vfio-pci
 
-      DMA devices using kernel driver
-      ===============================
-      0000:00:04.0 'Sky Lake-E CBDMA Registers 2021' drv=ioatdma unused=vfio-pci
-      0000:00:04.1 'Sky Lake-E CBDMA Registers 2021' drv=ioatdma unused=vfio-pci
+    DMA devices using kernel driver
+    ===============================
+    0000:00:04.0 'Sky Lake-E CBDMA Registers 2021' drv=ioatdma unused=vfio-pci
+    0000:00:04.1 'Sky Lake-E CBDMA Registers 2021' drv=ioatdma unused=vfio-pci
 
 Test case
 =========
@@ -69,12 +69,12 @@ Common steps
 ------------
 1. Bind 1 NIC port and CBDMA channels to vfio-pci::
 
-      <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci <DUT port pci device id>
-      <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci <DUT port DMA device id>
+    <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci <DUT port pci device id>
+    <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci <DUT port DMA device id>
 
-      For example, Bind 1 NIC port and 2 CBDMA channels::
-      <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci 0000:00:18.0
-      <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci 0000:00:04.0,0000:00:04.1
+    For example, Bind 1 NIC port and 2 CBDMA channels::
+    <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci 0000:00:18.0
+    <dpdk dir># ./usertools/dpdk-devbind.py -b vfio-pci 0000:00:04.0,0000:00:04.1
 
 2. On VM1 and VM2, bind virtio device(for example,0000:00:05.0) with vfio-pci driver::
 
@@ -83,23 +83,22 @@ Common steps
     echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
     <dpdk dir># ./usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:00:05.0
 
-Test Case 1: VM2VM virtio-pmd split ring mergeable path 8 queues CBDMA enable with server mode stable test
-----------------------------------------------------------------------------------------------------------
-This case uses testpmd and QEMU to test split ring mergeable path with 8 queues and CBDMA enable with server mode,
-In VM, use testpmd to send imix packets, and relaunch vhost-user 10 times to test stable.
+Test Case 1: VM2VM virtio-pmd split ring mergeable path dynamic queue size with cbdma enable and server mode
+------------------------------------------------------------------------------------------------------------
+This case tests split ring mergeable path in VM2VM vhost-user/virtio-pmd topology when vhost uses the asynchronous operations with CBDMA channels,
+check that it can work normally after dynamically changing queue number, reconnection has also been tested.
 
 1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
 
-2. Launch the testpmd with 2 vhost port and 8 queues by below commands::
+2. Launch the testpmd with 2 vhost ports below commands::
 
     <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
     -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
     -a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8 \
-    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,\
-    lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;rxq0;rxq1;rxq2;rxq3]' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;rxq0;rxq1;rxq2;rxq3]' \
+    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=4 --txq=4 \
+    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
     testpmd> start
 
 3. Launch VM1 and VM2 using qemu::
@@ -113,8 +112,7 @@ In VM, use testpmd to send imix packets, and relaunch vhost-user 10 times to tes
     -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
     -chardev socket,id=char0,path=./vhost-net0,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,\
-    mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
 
     taskset -c 17-27 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 9 -m 4096 \
     -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
@@ -125,69 +123,86 @@ In VM, use testpmd to send imix packets, and relaunch vhost-user 10 times to tes
     -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6003-:22 \
     -chardev socket,id=char0,path=./vhost-net1,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,mq=on,\
-    vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
 
-4. On VM1 and VM2, bind virtio device with vfio-pci driver, as common step 2.
+4. On VM1 and VM2, bind virtio device with vfio-pci driver::
+
+    modprobe vfio
+    modprobe vfio-pci
+    echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+    ./usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:00:05.0
 
 5. Launch testpmd in VM1::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
-    --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
     testpmd> set fwd mac
     testpmd> start
 
-6. Launch testpmd in VM2, sent imix pkts from VM2::
+6. Launch testpmd in VM2 and send imix pkts, check imix packets can looped between two VMs for 1 mins and 4 queues (queue0 to queue3) have packets rx/tx::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
-    --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
     testpmd> set fwd mac
     testpmd> set txpkts 64,256,512,1024,2000,64,256,512,1024,2000
-    testpmd> start tx_first 1
+    testpmd> start tx_first 32
+    testpmd> show port stats all
 
-7. Check imix packets can looped between two VMs and 8 queues all have packets rx/tx::
+7. Check vhost use the asynchronous data path(funtion like virtio_dev_rx_async_xxx/virtio_dev_tx_async_xxx)::
 
-    testpmd> show port stats all
-    testpmd> stop
+    perf top
 
-8. Relaunch and start vhost side testpmd with below cmd::
+8. On host, dynamic change queue numbers::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-    -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
-    -a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8 \
-    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,\
-    lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+    testpmd> stop
+    testpmd> port stop all
+    testpmd> port config all rxq 8
+    testpmd> port config all txq 8
+    testpmd> port start all
     testpmd> start
 
-9. Send pkts by testpmd in VM2, check imix packets can looped between two VMs and 8 queues all have packets rx/tx::
+9. Send packets by testpmd in VM2::
 
     testpmd> stop
-    testpmd> start tx_first 1
+    testpmd> start tx_first 32
     testpmd> show port stats all
-    testpmd> stop
 
-10. Rerun step 7-8 for 10 times.
+10. Check vhost testpmd RX/TX can work normally, packets can looped between two VMs and both 8 queues can RX/TX traffic.
 
-Test Case 2: VM2VM virtio-pmd split ring mergeable path dynamic queue size CBDMA enable with server mode test
--------------------------------------------------------------------------------------------------------------
-This case uses testpmd and QEMU to test split ring mergeable path and CBDMA enable with server mode,
-In VM, use testpmd to send imix packets, and then dynamic queue size from 4 to 8 to test it works well or not.
+11. Rerun step 7.
+
+12. Relaunch and start vhost side testpmd with 8 queues::
+
+	./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
+	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
+	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
+	-- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8 \
+	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+	testpmd> start
+
+13. Send packets by testpmd in VM2, check imix packets can looped between two VMs for 1 mins and 8 queues all have packets rx/tx::
+
+	testpmd> stop
+	testpmd> start tx_first 32
+	testpmd> show port stats all
+
+14. Rerun step 12-13 for 5 times.
+
+Test Case 2: VM2VM virtio-pmd split ring non-mergeable path dynamic queue size with cbdma enable and server mode
+----------------------------------------------------------------------------------------------------------------
+This case tests split ring non-mergeable path in VM2VM vhost-user/virtio-pmd topology when vhost uses the asynchronous operations with CBDMA channels,
+check that it can work normally after dynamically changing queue number, reconnection has also been tested.
 
 1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
 
 2. Launch the testpmd with 2 vhost ports below commands::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-    -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
     -a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3]' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3]' \
+    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;rxq0;rxq1;rxq2;rxq3]' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;rxq0;rxq1;rxq2;rxq3]' \
     -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=4 --txq=4 \
-    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,\
-    lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
     testpmd> start
 
 3. Launch VM1 and VM2 using qemu::
@@ -201,8 +216,7 @@ In VM, use testpmd to send imix packets, and then dynamic queue size from 4 to 8
     -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
     -chardev socket,id=char0,path=./vhost-net0,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,\
-    mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=off,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
 
     taskset -c 17-27 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 9 -m 4096 \
     -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
@@ -213,72 +227,69 @@ In VM, use testpmd to send imix packets, and then dynamic queue size from 4 to 8
     -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6003-:22 \
     -chardev socket,id=char0,path=./vhost-net1,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,mq=on,\
-    vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=off,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
+
+4. On VM1 and VM2, bind virtio device with vfio-pci driver::
 
-4. On VM1 and VM2, bind virtio device with vfio-pci driver, as common step 2.
+    modprobe vfio
+    modprobe vfio-pci
+    echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+    ./usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:00:05.0
 
 5. Launch testpmd in VM1::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
-    --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=8 --rxq=8 --txd=1024 --rxd=1024
     testpmd> set fwd mac
     testpmd> start
 
-6. Launch testpmd in VM2, sent imix pkts from VM2::
+6. Launch testpmd in VM2 and send imix pkts, check imix packets can looped between two VMs for 1 mins and 4 queues (queue0 to queue3) have packets rx/tx::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
-    --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=8 --rxq=8 --txd=1024 --rxd=1024
     testpmd> set fwd mac
-    testpmd> set txpkts 64,256,512,1024,2000,64,256,512,1024,2000
-    testpmd> start tx_first 1
+    testpmd> set txpkts 64,256,512
+    testpmd> start tx_first 32
+    testpmd> show port stats all
 
-7. Check imix packets can looped between two VMs and  4 queues (queue0 to queue3) have packets rx/tx::
+7. Check vhost use the asynchronous data path(funtion like virtio_dev_rx_async_xxx/virtio_dev_tx_async_xxx)::
 
-    testpmd> show port stats all
-    testpmd> stop
+    perf top
 
-8. Relaunch and start vhost side testpmd with 8 queues::
+8. On VM1 and VM2, dynamic change queue numbers at virtio-pmd side from 8 queues to 4 queues::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-    -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
-    -a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8 \
-    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,\
-    lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+    testpmd> stop
+    testpmd> port stop all
+    testpmd> port config all rxq 4
+    testpmd> port config all txq 4
+    testpmd> port start all
     testpmd> start
 
-9. Send pkts by testpmd in VM2, check imix packets can looped between two VMs and 8 queues all have packets rx/tx::
+9. Send packets by testpmd in VM2, check Check virtio-pmd RX/TX can work normally and imix packets can looped between two VMs for 1 mins::
 
     testpmd> stop
-    testpmd> start tx_first 1
+    testpmd> start tx_first 32
     testpmd> show port stats all
-    testpmd> stop
 
-10. Rerun step 7-8 for 10 times.
+10. Rerun step 7.
 
-Test Case 3: VM2VM virtio-pmd packed ring mergeable path 8 queues CBDMA enable test
------------------------------------------------------------------------------------
-This case uses testpmd and QEMU to test packed ring mergeable path with 8 queues and CBDMA enable,
-In VM, use testpmd to send imix packets, and then quit VM1 and change VM1 from packed ring path to splirt ring path to test.
+11. Stop testpmd in VM2, and check that 4 queues can RX/TX traffic.
+
+Test Case 3: VM2VM virtio-pmd packed ring mergeable path dynamic queue size with cbdma enable and server mode
+-------------------------------------------------------------------------------------------------------------
+This case tests packed ring mergeable path with virtio1.1 and server mode in VM2VM vhost-user/virtio-pmd topology when vhost uses the asynchronous operations with CBDMA channels,check that it can work normally after dynamically changing queue number.
 
 1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
 
-2. Launch the testpmd with 2 vhost port and 8 queues by below commands::
+2. Launch the testpmd with 2 vhost ports below commands::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost  \
-    -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
     -a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-    --vdev 'net_vhost0,iface=vhost-net0,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-    --vdev 'net_vhost1,iface=vhost-net1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7]'  \
-    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8 \
-    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,\
-    lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;rxq0;rxq1;rxq2;rxq3]' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;rxq0;rxq1;rxq2;rxq3]' \
+    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=4 --txq=4 \
+    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
     testpmd> start
 
-3. Launch VM1 and VM2 with qemu::
+3. Launch VM1 and VM2 using qemu::
 
     taskset -c 6-16 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 9 -m 4096 \
     -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
@@ -287,10 +298,9 @@ In VM, use testpmd to send imix packets, and then quit VM1 and change VM1 from p
     -device virtserialport,chardev=vm1_qga0,name=org.qemu.guest_agent.2 -daemonize \
     -monitor unix:/tmp/vm1_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
     -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
-    -chardev socket,id=char0,path=./vhost-net0 \
+    -chardev socket,id=char0,path=./vhost-net0,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,\
-    mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :10
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :10
 
     taskset -c 17-27 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 9 -m 4096 \
     -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
@@ -299,62 +309,172 @@ In VM, use testpmd to send imix packets, and then quit VM1 and change VM1 from p
     -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
     -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
     -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6003-:22 \
-    -chardev socket,id=char0,path=./vhost-net1 \
+    -chardev socket,id=char0,path=./vhost-net1,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,mq=on,\
-    vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :12
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :12
 
-4. On VM1 and VM2, bind virtio device with vfio-pci driver, as common step 2.
+4. On VM1 and VM2, bind virtio device with vfio-pci driver::
+
+    modprobe vfio
+    modprobe vfio-pci
+    echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+    ./usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:00:05.0
 
 5. Launch testpmd in VM1::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
-    --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
-    testpmd> set fwd mac
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
+    testpmd> set mac fwd
     testpmd> start
 
-6. Launch testpmd in VM2, sent imix pkts from VM2::
+6. Launch testpmd in VM2 and send imix pkts, check imix packets can looped between two VMs for 1 mins and 4 queues (queue0 to queue3) have packets rx/tx::
 
-    <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
-    --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
-    testpmd> set fwd mac
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
+    testpmd> set mac fwd
     testpmd> set txpkts 64,256,512,1024,2000,64,256,512,1024,2000
-    testpmd> start tx_first 1
-
-7. Check imix packets can looped between two VMs and 8 queues all have packets rx/tx::
-
+    testpmd> start tx_first 32
     testpmd> show port stats all
     testpmd> stop
 
-8. Quit VM2 and relaunch VM2 with split ring::
+7. Quit VM2 and relaunch VM2 with split ring::
 
-    taskset -c 6-16 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 9 -m 4096 \
+    taskset -c 17-27 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 9 -m 4096 \
     -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
-    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04-2.img  \
     -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
     -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
     -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
-    -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
-    -chardev socket,id=char0,path=./vhost-net0 \
+    -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6003-:22 \
+    -chardev socket,id=char0,path=./vhost-net1,server \
     -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,\
-    mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=off,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
 
-9. Bind virtio device with vfio-pci driver::
+8. Bind virtio device with vfio-pci driver::
 
     modprobe vfio
     modprobe vfio-pci
     echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
     <dpdk dir># ./usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:00:05.0
 
-10. Launch testpmd in VM2 and send imix pkts from VM2::
+9. Launch testpmd in VM2 and send imix pkts from VM2::
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip \
 	--txq=8 --rxq=8 --txd=1024 --rxd=1024 --max-pkt-len=9600 --rx-offloads=0x00002000
 	testpmd> set fwd mac
 	testpmd> set txpkts 64,256,512,1024,2000,64,256,512,1024,2000
 
-11. Check imix packets can looped between two VMs and 8 queues all have packets rx/tx::
+10. Check imix packets can looped between two VMs and 4 queues all have packets rx/tx::
+
+	testpmd> show port stats all
+	testpmd> stop
+	testpmd> start
+
+11. Check vhost use the asynchronous data path(funtion like virtio_dev_rx_async_xxx/virtio_dev_tx_async_xxx)::
+
+	perf top
 
+12. On host, dynamic change queue numbers::
+
+	testpmd> stop
+	testpmd> port stop all
+	testpmd> port config all rxq 8
+	testpmd> port config all txq 8
+	testpmd> port start all
+	testpmd> start
+
+13. Send packets by testpmd in VM2::
+
+	testpmd> stop
+	testpmd> start tx_first 32
 	testpmd> show port stats all
+
+14. Check vhost testpmd RX/TX can work normally, packets can looped between two VMs and both 8 queues can RX/TX traffic.
+
+15. Rerun step 11.
+
+Test Case 4: VM2VM virtio-pmd packed ring non-mergeable path dynamic queue size with cbdma enable and server mode
+-----------------------------------------------------------------------------------------------------------------
+This case tests packed ring non-mergeable path with virtio1.1 and server mode in VM2VM vhost-user/virtio-pmd topology when vhost uses the asynchronous operations with CBDMA channels,check that it can work normally after dynamically changing queue number.
+
+1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
+
+2. Launch the testpmd with 2 vhost ports below commands::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost -a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
+    -a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
+    --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
+    -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8 \
+    --lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore5@0000:80:04.4,lcore5@0000:80:04.5,lcore5@0000:80:04.6,lcore5@0000:80:04.7]
+    testpmd> start
+
+3. Launch VM1 and VM2 using qemu::
+
+    taskset -c 6-16 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 9 -m 4096 \
+    -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.img  \
+    -chardev socket,path=/tmp/vm1_qga0.sock,server,nowait,id=vm1_qga0 -device virtio-serial \
+    -device virtserialport,chardev=vm1_qga0,name=org.qemu.guest_agent.2 -daemonize \
+    -monitor unix:/tmp/vm1_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
+    -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
+    -chardev socket,id=char0,path=./vhost-net0,server \
+    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=off,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :10
+
+    taskset -c 17-27 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 9 -m 4096 \
+    -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04-2.img  \
+    -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
+    -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
+    -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
+    -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6003-:22 \
+    -chardev socket,id=char0,path=./vhost-net1,server \
+    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=8 \
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=off,mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :12
+
+4. On VM1 and VM2, bind virtio device with vfio-pci driver::
+
+    modprobe vfio
+    modprobe vfio-pci
+    echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+    ./usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:00:05.0
+
+5. Launch testpmd in VM1::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=4 --rxq=4 --txd=1024 --rxd=1024
+    testpmd> set mac fwd
+    testpmd> start
+
+6. Launch testpmd in VM2 and send imix pkts, check imix packets can looped between two VMs for 1 mins::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c 0x3 -n 4 -- -i --tx-offloads=0x00 --enable-hw-vlan-strip --txq=4 --rxq=4 --txd=1024 --rxd=1024
+    testpmd> set mac fwd
+    testpmd> set txpkts 64,256,512
+    testpmd> start tx_first 32
+    testpmd> show port stats all
+
+7. Check vhost use the asynchronous data path(funtion like virtio_dev_rx_async_xxx/virtio_dev_tx_async_xxx)::
+
+    perf top
+
+8. On VM2, stop the testpmd, check that both 4 queues have packets rx/tx::
+
+    testpmd> stop
+
+9. On VM1 and VM2, dynamic change queue numbers at virtio-pmd side from 4 queues to 8 queues::
+
+    testpmd> stop
+    testpmd> port stop all
+    testpmd> port config all rxq 8
+    testpmd> port config all txq 8
+    testpmd> port start all
+    testpmd> start
+
+10. Send packets by testpmd in VM2, check Check virtio-pmd RX/TX can work normally and imix packets can looped between two VMs for 1 mins::
+
 	testpmd> stop
+	testpmd> start tx_first 32
+	testpmd> show port stats all
+
+11. Rerun step 7.
+
+12. Stop testpmd in VM2, and check that 4 queues can RX/TX traffic.
