diff --git a/test_plans/vhost_cbdma_test_plan.rst b/test_plans/vhost_cbdma_test_plan.rst
index 3d0e518a..a830d15d 100644
--- a/test_plans/vhost_cbdma_test_plan.rst
+++ b/test_plans/vhost_cbdma_test_plan.rst
@@ -38,40 +38,42 @@ Overview
 --------
 
 This feature supports to offload large data movement in vhost enqueue operations
-from the CPU to the I/OAT device for every queue. Note that I/OAT acceleration
-is just enabled for split rings now. In addition, a queue can only use one I/OAT
-device, and I/OAT devices cannot be shared among vhost ports and queues. That is,
-an I/OAT device can only be used by one queue at a time. DMA devices used by
-queues are assigned by users; for a queue without assigning a DMA device, the
-PMD will leverages librte_vhost to perform vhost enqueue operations. Moreover,
-users cannot enable I/OAT acceleration for live-migration. Large copies are
-offloaded from the CPU to the DMA engine in an asynchronous manner. The CPU just
-submits copy jobs to the DMA engine and without waiting for DMA copy completion;
+from the CPU to the I/OAT(a DMA engine in Intel's processor) device for every queue.
+In addition, a queue can only use one I/OAT device, and I/OAT devices cannot be shared
+among vhost ports and queues. That is, an I/OAT device can only be used by one queue at
+a time. DMA devices(e.g.,CBDMA) used by queues are assigned by users; for a queue without
+assigning a DMA device, the PMD will leverages librte_vhost to perform vhost enqueue
+operations. Moreover, users cannot enable I/OAT acceleration for live-migration. Large
+copies are offloaded from the CPU to the DMA engine in an asynchronous manner. The CPU
+just submits copy jobs to the DMA engine and without waiting for DMA copy completion;
 there is no CPU intervention during DMA data transfer. By overlapping CPU
 computation and DMA copy, we can save precious CPU cycles and improve the overall
 throughput for vhost-user PMD based applications, like OVS. Due to startup overheads
 associated with DMA engines, small copies are performed by the CPU.
+DPDK 21.11 adds vfio support for DMA device in vhost. 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.
 
-We introduce a new vdev parameter to enable DMA acceleration for Tx
-operations of queues:
-
- - dmas: This parameter is used to specify the assigned DMA device of
-   a queue.
+We introduce a new vdev parameter to enable DMA acceleration for Tx operations of queues:
+    - dmas: This parameter is used to specify the assigned DMA device of a queue.
 
 Here is an example:
- $ ./dpdk-testpmd -c f -n 4 \
-   --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@80:04.0]'
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -c f -n 4 \
+    --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@0000:00:04.0] \
+    --iova=va -- -i'
 
-Test Case 1: PVP Split all path with DMA-accelerated vhost enqueue
-==================================================================
+Test Case 1: PVP split ring all path vhost enqueue operations with cbdma
+========================================================================
 
 Packet pipeline: 
 ================
 TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
-1. Bind one cbdma port and one nic port to vfio-pci, then launch vhost by below command::
+1. Bind 1 CBDMA port and 1 NIC port to vfio-pci, then launch vhost by below command::
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@80:04.0]' \
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost \
+    --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@0000:00:04.0]' \
+    --iova=va \
     -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
@@ -80,11 +82,11 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
-3. Send imix packets [64,1518] from packet generator, check the throughput can get expected data, restart vhost port, then check throughput again::
+3. Send imix packets [64,1518] from packet generator, check the throughput can get expected data, restart vhost port and send imix pkts again, check get same throuhput::
 
     testpmd>show port stats all
     testpmd>stop
@@ -95,7 +97,7 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=0,queues=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
@@ -103,7 +105,7 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=1,queues=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
@@ -111,26 +113,37 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=0,queues=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
 7. Relaunch virtio-user with vector_rx path, then repeat step 3::
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 \
-    --no-pci --file-prefix=virtio \
-    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=0,queues=1 \
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=0,vectorized=1,queues=1 \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
+    >set fwd mac
+    >start
+
+8. Quit all testpmd and relaunch vhost with iova=pa by below command::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost \
+    --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@0000:00:04.0]' \
+    --iova=pa \
     -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
-Test Case 2: Split ring dynamic queue number test for DMA-accelerated vhost Tx operations
-=========================================================================================
+9. Rerun steps 2-7.
+
+Test Case 2: PVP split ring dynamic queue number vhost enqueue operations with cbdma
+=====================================================================================
 
-1. Bind 8 cbdma channels and one nic port to vfio-pci, then launch vhost by below command::
+1. Bind 8 CBDMA ports and 1 NIC port to vfio-pci, then launch vhost by below command::
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
      --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1' \
+     --iova=va \
      -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
      >set fwd mac
      >start
@@ -139,48 +152,64 @@ Test Case 2: Split ring dynamic queue number test for DMA-accelerated vhost Tx o
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 30-31 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=8,server=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
     >set fwd mac
     >start
 
-3. Send imix packets from packet generator with random ip, check perforamnce can get target.
+3. Send imix packets[64,1518] from packet generator with random ip, check perforamnce can get target.
 
 4. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
 
-5. Quit vhost port and relaunch vhost with 4 queues w/ cbdma::
+5. Quit and relaunch vhost with 4 queues w/ cbdma and 4 queues w/o cbdma::
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
-    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=4,client=1,dmas=[txq0@00:04.0;txq1@00:04.1;txq2@00:04.2;txq3@00:04.3]' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=4 --rxq=4
+    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3]' \
+    --iova=va \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
     >set fwd mac
     >start
 
-6. Send imix packets from packet generator with random ip, check perforamnce can get target.
+6. Send imix packets[64,1518] from packet generator with random ip, check perforamnce can get target.
 
-7. Stop vhost port, check vhost RX and TX direction both exist packtes in 4 queues from vhost log.
+7. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
 
-8. Quit vhost port and relaunch vhost with 8 queues w/ cbdma::
+8. Quit and relaunch vhost with 8 queues w/ cbdma::
 
      ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
-    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,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]' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
-    >set fwd mac
-    >start
+     --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3;txq4@0000:00:04.4;txq5@0000:00:04.5;txq6@0000:00:04.6;txq7@0000:00:04.7]' \
+     --iova=va \
+     -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+     >set fwd mac
+     >start
 
-9. Send imix packets from packet generator with random ip, check perforamnce can get target.
+9. Send imix packets[64,1518] from packet generator with random ip, check perforamnce can get target.
 
 10. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
 
-Test Case 3: PVP packed ring all path with DMA-accelerated vhost enqueue
-========================================================================
+11. Quit and relaunch vhost with iova=pa, 6 queues w/ cbdma and 2 queues w/o cbdma::
+
+     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
+     --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3;txq4@0000:00:04.4;txq5@0000:00:04.5]' \
+     --iova=pa \
+     -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+     >set fwd mac
+     >start
+
+12. Send imix packets[64,1518] from packet generator with random ip, check perforamnce can get target.
+
+13. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
+
+Test Case 3: PVP packed ring all path vhost enqueue operations with cbdma
+=========================================================================
 
 Packet pipeline: 
 ================
 TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
-1. Bind one cbdma port and one nic port to vfio-pci, then launch vhost by below command::
+1. Bind 1 CBDMA port and 1 NIC port to vfio-pci, then launch vhost by below command::
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@80:04.0]' \
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@0000:80:04.0]' \
+    --iova=va \
     -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
@@ -189,11 +218,11 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=1,packed_vq=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
-3. Send imix packets [64,1518] from packet generator, check the throughput can get expected data, restart vhost port, then check throughput again::
+3. Send imix packets [64,1518] from packet generator, check the throughput can get expected data, restart vhost port and send imix pkts again, check get same throuhput::
 
     testpmd>show port stats all
     testpmd>stop
@@ -204,7 +233,7 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=0,queues=1,packed_vq=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
@@ -212,7 +241,7 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=1,queues=1,packed_vq=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
@@ -220,35 +249,45 @@ TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
     --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=0,queues=1,packed_vq=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
 7. Relaunch virtio-user with vectorized path, then repeat step 3::
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 \
-    --no-pci --file-prefix=virtio \
-    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=1,queues=1,packed_vq=1 \
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio --force-max-simd-bitwidth=512 \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=1,packed_vq=1,vectorized=1,queues=1 \
     -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
-8. Relaunch virtio-user with vector_rx path, then repeat step 3::
+8. Relaunch virtio-user with vectorized path and ring size is not power of 2, then repeat step 3::
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 \
-    --no-pci --file-prefix=virtio \
-    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=1,queues=1,packed_vq=1 \
-    -- -i --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio --force-max-simd-bitwidth=512 \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=1,packed_vq=1,vectorized=1,queues=1,queue_size=1025 \
+    -- -i --nb-cores=1 --txd=1025 --rxd=1025
+    >set fwd mac
+    >start
+
+9. Quit all testpmd and relaunch vhost with iova=pa by below command::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost \
+    --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@0000:80:04.0]' \
+    --iova=pa \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
     >set fwd mac
     >start
 
-Test Case 4: Packed ring dynamic queue number test for DMA-accelerated vhost Tx operations
-==========================================================================================
+10. Rerun steps 2-8.
+
+Test Case 4: PVP packed ring dynamic queue number vhost enqueue operations with cbdma
+=====================================================================================
 
-1. Bind 8 cbdma channels and one nic port to vfio-pci, then launch vhost by below command::
+1. Bind 8 CBDMA ports and 1 NIC port to vfio-pci, then launch vhost by below command::
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
      --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1' \
+     --iova=va \
      -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
      >set fwd mac
      >start
@@ -256,8 +295,8 @@ Test Case 4: Packed ring dynamic queue number test for DMA-accelerated vhost Tx
 2. Launch virtio-user by below command::
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 30-31 --no-pci --file-prefix=virtio \
-    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=8,server=1,packed_vq=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=0,queues=8,server=1,packed_vq=1 \
+    -- -i  --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
     >set fwd mac
     >start
 
@@ -265,11 +304,12 @@ Test Case 4: Packed ring dynamic queue number test for DMA-accelerated vhost Tx
 
 4. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
 
-5. Quit vhost port and relaunch vhost with 4 queues w/ cbdma::
+5. Quit and relaunch vhost with 4 queues w/ cbdma and 4 queues w/o cbdma::
 
     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
-    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=4,client=1,dmas=[txq0@80:04.0;txq1@80:04.1;txq2@80:04.2;txq3@80:04.3]' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=4 --rxq=4
+    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,dmas=[txq0@0000:80:04.0;txq1@0000:80:04.1;txq2@0000:80:04.2;txq3@0000:80:04.3]' \
+    --iova=va \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
     >set fwd mac
     >start
 
@@ -277,71 +317,102 @@ Test Case 4: Packed ring dynamic queue number test for DMA-accelerated vhost Tx
 
 7. Stop vhost port, check vhost RX and TX direction both exist packtes in 4 queues from vhost log.
 
-8. Quit vhost port and relaunch vhost with 8 queues w/ cbdma::
+8. Quit and relaunch vhost with 8 queues w/ cbdma::
 
      ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
-    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,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]' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
-    >set fwd mac
-    >start
+     --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,dmas=[txq0@0000:80:04.0;txq1@0000:80:04.1;txq2@0000:80:04.2;txq3@0000:80:04.3;txq4@0000:80:04.4;txq5@0000:80:04.5;txq6@0000:80:04.6;txq7@0000:80:04.7]' \
+     --iova=va \
+     -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+     >set fwd mac
+     >start
 
 9. Send imix packets from packet generator with random ip, check perforamnce can get target.
 
 10. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
 
-Test Case 5: Compare PVP split ring performance between CPU copy, CBDMA copy and Sync copy
-==========================================================================================
+11. Quit and relaunch vhost with iova=pa, 6 queues w/ cbdma and 2 queues w/o cbdma::
 
-1. Bind one cbdma port and one nic port which on same numa to vfio-pci, then launch vhost by below command::
+     ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 28-29  \
+     --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=8,client=1,dmas=[txq0@0000:80:04.0;txq1@0000:80:04.1;txq2@0000:80:04.2;txq3@0000:80:04.3;txq4@0000:80:04.4;txq5@0000:80:04.5]' \
+     --iova=pa \
+     -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+     >set fwd mac
+     >start
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1,client=1,dmas=[txq0@00:01.0]' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024
-    >set fwd mac
-    >start
+12. Send imix packets from packet generator with random ip, check perforamnce can get target.
 
-2. Launch virtio-user with inorder mergeable path::
+13. Stop vhost port, check vhost RX and TX direction both exist packtes in 8 queues from vhost log.
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
-    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=1,server=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
-    >set fwd mac
-    >start
+Test Case 5: loopback split ring large chain packets stress test with cbdma enqueue
+====================================================================================
 
-3. Send packets with 64b and 1518b seperately from packet generator, record the throughput as sync copy throughput for 64b and cbdma copy for 1518b::
+Packet pipeline:
+================
+Vhost <--> Virtio
 
-    testpmd>show port stats all
+1. Bind 1 CBDMA channel to vfio-pci and launch vhost::
 
-4.Quit vhost side, relaunch with below cmd::
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-3 -n 4 \
+    --vdev 'eth_vhost0,iface=vhost-net0,queues=1,dmas=[txq0@0000:00:04.0]' \
+    --iova=va \
+    -- -i --nb-cores=1 --mbuf-size=65535
 
- ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1,client=1,dmas=[txq0@00:01.0]' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024
-    >set fwd mac
+2. Launch virtio and start testpmd::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 30,31 -n 4  --file-prefix=testpmd0 --no-pci  \
+    --vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=./vhost-net0,queues=1, \
+    mrg_rxbuf=1,in_order=0,vectorized=1,queue_size=2048 \
+    -- -i --rxq=1 --txq=1 --txd=2048 --rxd=2048 --nb-cores=1
     >start
 
-5. Send packets with 1518b from packet generator, record the throughput as sync copy throughput for 1518b::
+3. Send large packets from vhost, check virtio can receive packets::
 
-    testpmd>show port stats all
+    testpmd> vhost enable tx all
+    testpmd> set txpkts 65535,65535,65535,65535,65535
+    testpmd> start tx_first 32
+    testpmd> show port stats all
 
-6. Quit two testpmd, relaunch vhost by below command::
+4. Quit all testpmd and relaunch vhost with iova=pa::
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1' \
-    -- -i --nb-cores=1 --txd=1024 --rxd=1024
-    >set fwd mac
-    >start
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-3 -n 4 \
+    --vdev 'eth_vhost0,iface=vhost-net0,queues=1,dmas=[txq0@0000:00:04.0]' \
+    --iova=pa \
+    -- -i --nb-cores=1 --mbuf-size=65535
 
-7. Launch virtio-user with inorder mergeable path::
+5. Rerun steps 2-3.
 
-    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
-    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=1 \
-    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
-    >set fwd mac
+Test Case 6: loopback packed ring large chain packets stress test with cbdma enqueue
+====================================================================================
+
+Packet pipeline:
+================
+Vhost <--> Virtio
+
+1. Bind 1 CBDMA channel to vfio-pci and launch vhost::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-3 -n 4 \
+    --vdev 'eth_vhost0,iface=vhost-net0,queues=1,dmas=[txq0@0000:00:04.0]' \
+    --iova=va \
+    -- -i --nb-cores=1 --mbuf-size=65535
+
+2. Launch virtio and start testpmd::
+
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 30,31 -n 4  --file-prefix=testpmd0 --no-pci  \
+    --vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=./vhost-net0,queues=1, \
+    mrg_rxbuf=1,in_order=0,vectorized=1,packed_vq=1,queue_size=2048 \
+    -- -i --rxq=1 --txq=1 --txd=2048 --rxd=2048 --nb-cores=1
     >start
 
-8. Send packets with 64b from packet generator, record the throughput as cpu copy for 64b::
+3. Send large packets from vhost, check virtio can receive packets::
 
-    testpmd>show port stats all
+    testpmd> vhost enable tx all
+    testpmd> set txpkts 65535,65535,65535,65535,65535
+    testpmd> start tx_first 32
+    testpmd> show port stats all
+
+4. Quit all testpmd and relaunch vhost with iova=pa::
 
-9. Check performance can meet below requirement::
+    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-3 -n 4 \
+    --vdev 'eth_vhost0,iface=vhost-net0,queues=1,dmas=[txq0@0000:00:04.0]' --iova=pa -- -i --nb-cores=1 --mbuf-size=65535
 
-   (1)CPU copy vs. sync copy delta < 10% for 64B packet size
-   (2)CBDMA copy vs sync copy delta > 5% for 1518 packet size
+5. Rerun steps 2-3.
