diff --git a/test_plans/vm2vm_virtio_net_perf_test_plan.rst b/test_plans/vm2vm_virtio_net_perf_test_plan.rst
index f0107746..4085351a 100644
--- a/test_plans/vm2vm_virtio_net_perf_test_plan.rst
+++ b/test_plans/vm2vm_virtio_net_perf_test_plan.rst
@@ -1,4 +1,4 @@
-.. Copyright (c) <2020>, Intel Corporation
+.. Copyright (c) <2021>, Intel Corporation
    All rights reserved.
 
    Redistribution and use in source and binary forms, with or without
@@ -42,8 +42,7 @@ This test plan test several features in VM2VM topo:
 in the UDP/IP stack with vm2vm split ring and packed ring vhost-user/virtio-net mergeable path.
 2. Check the payload of large packet (larger than 1MB) is valid after forwarding packets with vm2vm split ring
 and packed ring vhost-user/virtio-net mergeable and non-mergeable path.
-3. Multi-queues number dynamic change in vm2vm vhost-user/virtio-net with split ring and packed ring.
-4. Check function and performance of split ring enqueue operation with multi-CBDMA channels.
+3. Multi-queues number dynamic change in vm2vm vhost-user/virtio-net with split ring and packed ring when vhost enqueue operation with multi-CBDMA channels.
 Note: For packed virtqueue virtio-net test, need qemu version > 4.2.0 and VM kernel version > v5.1.
 
 Test flow
@@ -65,7 +64,7 @@ Test Case 1: VM2VM split ring vhost-user/virtio-net test with tcp traffic
 
     taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -76,7 +75,7 @@ Test Case 1: VM2VM split ring vhost-user/virtio-net test with tcp traffic
 
    taskset -c 33 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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 \
@@ -120,7 +119,7 @@ Test Case 2: VM2VM split ring vhost-user/virtio-net CBDMA enable test with tcp t
 
     taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -131,7 +130,7 @@ Test Case 2: VM2VM split ring vhost-user/virtio-net CBDMA enable test with tcp t
 
    taskset -c 33 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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 \
@@ -161,7 +160,7 @@ Test Case 2: VM2VM split ring vhost-user/virtio-net CBDMA enable test with tcp t
     Port 0 should have tx packets above 1522
     Port 1 should have rx packets above 1522
 
-7. Check throughput and compare with case1, case2 performance should larger than case1.
+7. Check throughput and compare with case1, CBDMA enable performance should larger than w/o CBDMA performance when cross socket.
 
 Test Case 3: VM2VM split ring vhost-user/virtio-net test with udp traffic
 =========================================================================
@@ -177,7 +176,7 @@ Test Case 3: VM2VM split ring vhost-user/virtio-net test with udp traffic
 
     qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -188,7 +187,7 @@ Test Case 3: VM2VM split ring vhost-user/virtio-net test with udp traffic
 
     qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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 \
@@ -232,7 +231,7 @@ Test Case 4: Check split ring virtio-net device capability
 
     qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -243,7 +242,7 @@ Test Case 4: Check split ring virtio-net device capability
 
    qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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 \
@@ -280,7 +279,7 @@ Test Case 5: VM2VM virtio-net split ring mergeable 8 queues CBDMA enable test wi
 
     taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 8 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -291,7 +290,7 @@ Test Case 5: VM2VM virtio-net split ring mergeable 8 queues CBDMA enable test wi
 
    taskset -c 40 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 8 -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/ubuntu16-2.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 \
@@ -342,14 +341,22 @@ Test Case 5: VM2VM virtio-net split ring mergeable 8 queues CBDMA enable test wi
      --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=1 --txq=1
      testpmd>start
 
-11. Scp 1MB file form VM1 to VM2M, check packets can be forwarding success by scp::
+11. On VM1, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+12. On VM2, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+13. Scp 1MB file form VM1 to VM2M, check packets can be forwarding success by scp::
 
      Under VM1, run: `scp [xxx] root@1.1.1.8:/`   [xxx] is the file name
 
-12. Check the iperf performance, ensure queue0 can work from vhost side::
+14. Check the iperf performance, ensure queue0 can work from vhost side::
 
-     Under VM1, run: `taskset -c 0 iperf -s -i 1`
-     Under VM2, run: `taskset -c 0 iperf -c 1.1.1.2 -i 1 -t 60`
+     Under VM1, run: `iperf -s -i 1`
+     Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
 Test Case 6: VM2VM virtio-net split ring non-mergeable 8 queues CBDMA enable test with large packet payload valid check
 ========================================================================================================================
@@ -365,7 +372,7 @@ Test Case 6: VM2VM virtio-net split ring non-mergeable 8 queues CBDMA enable tes
 
     taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 8 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -376,7 +383,7 @@ Test Case 6: VM2VM virtio-net split ring non-mergeable 8 queues CBDMA enable tes
 
    taskset -c 40 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 8 -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/ubuntu16-2.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 \
@@ -427,14 +434,22 @@ Test Case 6: VM2VM virtio-net split ring non-mergeable 8 queues CBDMA enable tes
      --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=1 --txq=1
      testpmd>start
 
-11. Scp 1MB file form VM1 to VM2M, check packets can be forwarding success by scp::
+11. On VM1, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+12. On VM2, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+13. Scp 1MB file form VM1 to VM2M, check packets can be forwarding success by scp::
 
      Under VM1, run: `scp [xxx] root@1.1.1.8:/`   [xxx] is the file name
 
-12. Check the iperf performance, ensure queue0 can work from vhost side::
+14. Check the iperf performance, ensure queue0 can work from vhost side::
 
-     Under VM1, run: `taskset -c 0 iperf -s -i 1`
-     Under VM2, run: `taskset -c 0 iperf -c 1.1.1.2 -i 1 -t 60`
+     Under VM1, run: `iperf -s -i 1`
+     Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
 Test Case 7: VM2VM packed ring vhost-user/virtio-net test with tcp traffic
 ==========================================================================
@@ -450,7 +465,7 @@ Test Case 7: VM2VM packed ring vhost-user/virtio-net test with tcp traffic
 
     qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -461,7 +476,62 @@ Test Case 7: VM2VM packed ring vhost-user/virtio-net test with tcp traffic
 
    qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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:127.0.0.1:6003-:22 \
+    -chardev socket,id=char0,path=./vhost-net1 \
+    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,packed=on -vnc :12
+
+3. On VM1, set virtio device IP and run arp protocal::
+
+    ifconfig ens5 1.1.1.2
+    arp -s 1.1.1.8 52:54:00:00:00:02
+
+4. On VM2, set virtio device IP and run arp protocal::
+
+    ifconfig ens5 1.1.1.8
+    arp -s 1.1.1.2 52:54:00:00:00:01
+
+5. Check the iperf performance between two VMs by below commands::
+
+    Under VM1, run: `iperf -s -i 1`
+    Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
+
+6. Check 2VMs can receive and send big packets to each other::
+
+    testpmd>show port xstats all
+    Port 0 should have tx packets above 1522
+    Port 1 should have rx packets above 1522
+
+Test Case 8: VM2VM packed ring vhost-user/virtio-net CBDMA enable test with tcp traffic
+=======================================================================================
+
+1. Launch the Vhost sample by below commands::
+
+    rm -rf vhost-net*
+    ./dpdk-testpmd -l 2-4 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,queues=1,dmas=[txq0@00:04.0],dmathr=512' \
+    --vdev 'net_vhost1,iface=vhost-net1,queues=1,dmas=[txq0@00:04.1],dmathr=512'  -- -i --nb-cores=2 --txd=1024 --rxd=1024
+    testpmd>start
+
+2. Launch VM1 and VM2 on socket 1::
+
+    taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/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 type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,packed=on -vnc :10
+
+   taskset -c 33 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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 \
@@ -491,7 +561,9 @@ Test Case 7: VM2VM packed ring vhost-user/virtio-net test with tcp traffic
     Port 0 should have tx packets above 1522
     Port 1 should have rx packets above 1522
 
-Test Case 8: VM2VM packed ring vhost-user/virtio-net test with udp traffic
+7. Check throughput and compare with case6, CBDMA enable performance should larger than w/o CBDMA performance when cross socket.
+
+Test Case 9: VM2VM packed ring vhost-user/virtio-net test with udp traffic
 ==========================================================================
 
 1. Launch the Vhost sample by below commands::
@@ -516,7 +588,7 @@ Test Case 8: VM2VM packed ring vhost-user/virtio-net test with udp traffic
 
    qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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 \
@@ -546,7 +618,7 @@ Test Case 8: VM2VM packed ring vhost-user/virtio-net test with udp traffic
     Port 0 should have tx packets above 1522
     Port 1 should have rx packets above 1522
 
-Test Case 9: Check packed ring virtio-net device capability
+Test Case 10: Check packed ring virtio-net device capability
 ============================================================
 
 1. Launch the Vhost sample by below commands::
@@ -560,7 +632,7 @@ Test Case 9: Check packed ring virtio-net device capability
 
     qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -571,7 +643,7 @@ Test Case 9: Check packed ring virtio-net device capability
 
    qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -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/ubuntu16-2.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 \
@@ -594,21 +666,21 @@ Test Case 9: Check packed ring virtio-net device capability
     tx-tcp-ecn-segmentation: on
     tx-tcp6-segmentation: on
 
-Test Case 10: VM2VM virtio-net packed ring mergeable dynamic queues test with large packet payload valid check
-==============================================================================================================
+Test Case 11: VM2VM virtio-net packed ring mergeable 8 queues CBDMA enable test with large packet payload valid check
+=====================================================================================================================
 
 1. Launch the Vhost sample by below commands::
 
     rm -rf vhost-net*
-    ./dpdk-testpmd -l 1-5 -n 4 --no-pci --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8
+    ./dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0@00:04.0;txq1@00:04.1;txq2@00:04.2;txq3@00:04.3;txq4@00:04.4;txq5@00:04.5;txq6@00:04.6;txq7@00:04.7],dmathr=512' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0@80:04.0;txq1@80:04.1;txq2@80:04.2;txq3@80:04.3;txq4@80:04.4;txq5@80:04.5;txq6@80:04.6;txq7@80:04.7],dmathr=512'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8
     testpmd>start
 
 2. Launch VM1 and VM2 using qemu3.0::
 
     taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 8 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -619,7 +691,7 @@ Test Case 10: VM2VM virtio-net packed ring mergeable dynamic queues test with la
 
    taskset -c 40 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 8 -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/ubuntu16-2.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 \
@@ -649,36 +721,59 @@ Test Case 10: VM2VM virtio-net packed ring mergeable dynamic queues test with la
     Under VM1, run: `iperf -s -i 1`
     Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
-7. Quit vhost ports and relaunch vhost ports with 1 queues::
+7. Quit vhost ports and relaunch vhost ports w/o CBDMA channels::
 
-    ./dpdk-testpmd -l 1-5 -n 4 --no-pci --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=1 --txq=1
+    ./dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8
     testpmd>start
 
 8. Scp 1MB file form VM1 to VM2::
 
     Under VM1, run: `scp [xxx] root@1.1.1.8:/`   [xxx] is the file name
 
-9. Check the iperf performance, ensure queue0 can work from vhost side::
+9. Check the iperf performance and compare with CBDMA enable performance, ensure CMDMA enable performance is higher::
+
+    Under VM1, run: `iperf -s -i 1`
+    Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
+
+10. Quit vhost ports and relaunch vhost ports with 1 queues::
+
+     ./dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
+     --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=1 --txq=1
+     testpmd>start
+
+11. On VM1, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+12. On VM2, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+13. Scp 1MB file form VM1 to VM2M, check packets can be forwarding success by scp::
 
-    Under VM1, run: `taskset -c 0 iperf -s -i 1`
-    Under VM2, run: `taskset -c 0 iperf -c 1.1.1.2 -i 1 -t 60`
+     Under VM1, run: `scp [xxx] root@1.1.1.8:/`   [xxx] is the file name
+
+14. Check the iperf performance, ensure queue0 can work from vhost side::
 
-Test Case 11: VM2VM virtio-net packed ring non-mergeable dynamic queues test with large packet payload valid check
-===================================================================================================================
+     Under VM1, run: `iperf -s -i 1`
+     Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
+
+Test Case 12: VM2VM virtio-net packed ring non-mergeable 8 queues CBDMA enable test with large packet payload valid check
+=========================================================================================================================
 
 1. Launch the Vhost sample by below commands::
 
     rm -rf vhost-net*
-    ./dpdk-testpmd -l 1-5 -n 4 --no-pci --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8
+    ./dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8,dmas=[txq0@00:04.0;txq1@00:04.1;txq2@00:04.2;txq3@00:04.3;txq4@00:04.4;txq5@00:04.5;txq6@00:04.6;txq7@00:04.7],dmathr=512' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8,dmas=[txq0@80:04.0;txq1@80:04.1;txq2@80:04.2;txq3@80:04.3;txq4@80:04.4;txq5@80:04.5;txq6@80:04.6;txq7@80:04.7],dmathr=512'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8
     testpmd>start
 
 2. Launch VM1 and VM2 using qemu3.0::
 
     taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 8 -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/ubuntu16.img  \
+    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.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 \
@@ -689,7 +784,7 @@ Test Case 11: VM2VM virtio-net packed ring non-mergeable dynamic queues test wit
 
    taskset -c 40 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 8 -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/ubuntu16-2.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 \
@@ -719,17 +814,40 @@ Test Case 11: VM2VM virtio-net packed ring non-mergeable dynamic queues test wit
     Under VM1, run: `iperf -s -i 1`
     Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
-7. Quit vhost ports and relaunch vhost ports with 1 queues::
+7. Quit vhost ports and relaunch vhost ports w/o CBDMA channels::
 
-    ./dpdk-testpmd -l 1-5 -n 4 --no-pci --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
-    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=1 --txq=1
+    ./dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
+    --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=8 --txq=8
     testpmd>start
 
 8. Scp 1MB file form VM1 to VM2::
 
     Under VM1, run: `scp [xxx] root@1.1.1.8:/`   [xxx] is the file name
 
-9. Check the iperf performance, ensure queue0 can work from vhost side::
+9. Check the iperf performance and compare with CBDMA enable performance, ensure CMDMA enable performance is higher::
+
+    Under VM1, run: `iperf -s -i 1`
+    Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
+
+10. Quit vhost ports and relaunch vhost ports with 1 queues::
+
+     ./dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=8' \
+     --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=8'  -- -i --nb-cores=4 --txd=1024 --rxd=1024 --rxq=1 --txq=1
+     testpmd>start
+
+11. On VM1, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+12. On VM2, set virtio device::
+
+    ethtool -L ens5 combined 1
+
+13. Scp 1MB file form VM1 to VM2M, check packets can be forwarding success by scp::
+
+     Under VM1, run: `scp [xxx] root@1.1.1.8:/`   [xxx] is the file name
+
+14. Check the iperf performance, ensure queue0 can work from vhost side::
 
-    Under VM1, run: `taskset -c 0 iperf -s -i 1`
-    Under VM2, run: `taskset -c 0 iperf -c 1.1.1.2 -i 1 -t 60`
+     Under VM1, run: `iperf -s -i 1`
+     Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
\ No newline at end of file
