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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV, Intel Corporation, AT&T and others.
+
+vSwitchPerf test suites userguide
+---------------------------------
+
+General
+^^^^^^^
+
+VSPERF requires a traffic generators to run tests, automated traffic gen
+support in VSPERF includes:
+
+- IXIA traffic generator (IxNetwork hardware) and a machine that runs the IXIA
+  client software.
+- Spirent traffic generator (TestCenter hardware chassis or TestCenter virtual
+  in a VM) and a VM to run the Spirent Virtual Deployment Service image,
+  formerly known as "Spirent LabServer".
+- Xena Network traffic generator (Xena hardware chassis) that houses the Xena
+  Traffic generator modules.
+- Moongen software traffic generator. Requires a separate machine running
+  moongen to execute packet generation.
+
+If you want to use another traffic generator, please select the :ref:`trafficgen-dummy`
+generator.
+
+VSPERF Installation
+^^^^^^^^^^^^^^^^^^^
+
+To see the supported Operating Systems, vSwitches and system requirements,
+please follow the `installation instructions <vsperf-installation>`.
+
+Traffic Generator Setup
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Follow the `Traffic generator instructions <trafficgen-installation>` to
+install and configure a suitable traffic generator.
+
+Cloning and building src dependencies
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In order to run VSPERF, you will need to download DPDK and OVS. You can
+do this manually and build them in a preferred location, OR you could
+use vswitchperf/src. The vswitchperf/src directory contains makefiles
+that will allow you to clone and build the libraries that VSPERF depends
+on, such as DPDK and OVS. To clone and build simply:
+
+.. code-block:: console
+
+    $ cd src
+    $ make
+
+VSPERF can be used with stock OVS (without DPDK support). When build
+is finished, the libraries are stored in src_vanilla directory.
+
+The 'make' builds all options in src:
+
+* Vanilla OVS
+* OVS with vhost_user as the guest access method (with DPDK support)
+
+The vhost_user build will reside in src/ovs/
+The Vanilla OVS build will reside in vswitchperf/src_vanilla
+
+To delete a src subdirectory and its contents to allow you to re-clone simply
+use:
+
+.. code-block:: console
+
+     $ make clobber
+
+Configure the ``./conf/10_custom.conf`` file
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The ``10_custom.conf`` file is the configuration file that overrides
+default configurations in all the other configuration files in ``./conf``
+The supplied ``10_custom.conf`` file **MUST** be modified, as it contains
+configuration items for which there are no reasonable default values.
+
+The configuration items that can be added is not limited to the initial
+contents. Any configuration item mentioned in any .conf file in
+``./conf`` directory can be added and that item will be overridden by
+the custom configuration value.
+
+Further details about configuration files evaluation and special behaviour
+of options with ``GUEST_`` prefix could be found at :ref:`design document
+<design-configuration>`.
+
+Using a custom settings file
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If your ``10_custom.conf`` doesn't reside in the ``./conf`` directory
+of if you want to use an alternative configuration file, the file can
+be passed to ``vsperf`` via the ``--conf-file`` argument.
+
+.. code-block:: console
+
+    $ ./vsperf --conf-file <path_to_custom_conf> ...
+
+Note that configuration passed in via the environment (``--load-env``)
+or via another command line argument will override both the default and
+your custom configuration files. This "priority hierarchy" can be
+described like so (1 = max priority):
+
+1. Testcase definition section ``Parameters``
+2. Command line arguments
+3. Environment variables
+4. Configuration file(s)
+
+Further details about configuration files evaluation and special behaviour
+of options with ``GUEST_`` prefix could be found at :ref:`design document
+<design-configuration>`.
+
+.. _overriding-parameters-documentation:
+
+Overriding values defined in configuration files
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The configuration items can be overridden by command line argument
+``--test-params``. In this case, the configuration items and
+their values should be passed in form of ``item=value`` and separated
+by semicolon.
+
+Example:
+
+.. code:: console
+
+    $ ./vsperf --test-params "TRAFFICGEN_DURATION=10;TRAFFICGEN_PKT_SIZES=(128,);" \
+                             "GUEST_LOOPBACK=['testpmd','l2fwd']" pvvp_tput
+
+The second option is to override configuration items by ``Parameters`` section
+of the test case definition. The configuration items can be added into ``Parameters``
+dictionary with their new values. These values will override values defined in
+configuration files or specified by ``--test-params`` command line argument.
+
+Example:
+
+.. code:: python
+
+    "Parameters" : {'TRAFFICGEN_PKT_SIZES' : (128,),
+                    'TRAFFICGEN_DURATION' : 10,
+                    'GUEST_LOOPBACK' : ['testpmd','l2fwd'],
+                   }
+
+**NOTE:** In both cases, configuration item names and their values must be specified
+in the same form as they are defined inside configuration files. Parameter names
+must be specified in uppercase and data types of original and new value must match.
+Python syntax rules related to data types and structures must be followed.
+For example, parameter ``TRAFFICGEN_PKT_SIZES`` above is defined as a tuple
+with a single value ``128``. In this case trailing comma is mandatory, otherwise
+value can be wrongly interpreted as a number instead of a tuple and vsperf
+execution would fail. Please check configuration files for default values and their
+types and use them as a basis for any customized values. In case of any doubt, please
+check official python documentation related to data structures like tuples, lists
+and dictionaries.
+
+**NOTE:** Vsperf execution will terminate with runtime error in case, that unknown
+parameter name is passed via ``--test-params`` CLI argument or defined in ``Parameters``
+section of test case definition. It is also forbidden to redefine a value of
+``TEST_PARAMS`` configuration item via CLI or ``Parameters`` section.
+
+vloop_vnf
+^^^^^^^^^
+
+VSPERF uses a VM image called vloop_vnf for looping traffic in the deployment
+scenarios involving VMs. The image can be downloaded from
+`<http://artifacts.opnfv.org/>`__.
+
+Please see the installation instructions for information on :ref:`vloop-vnf`
+images.
+
+.. _l2fwd-module:
+
+l2fwd Kernel Module
+^^^^^^^^^^^^^^^^^^^
+
+A Kernel Module that provides OSI Layer 2 Ipv4 termination or forwarding with
+support for Destination Network Address Translation (DNAT) for both the MAC and
+IP addresses. l2fwd can be found in <vswitchperf_dir>/src/l2fwd
+
+Executing tests
+^^^^^^^^^^^^^^^
+
+All examples inside these docs assume, that user is inside the VSPERF
+directory. VSPERF can be executed from any directory.
+
+Before running any tests make sure you have root permissions by adding
+the following line to /etc/sudoers:
+
+.. code-block:: console
+
+    username ALL=(ALL)       NOPASSWD: ALL
+
+username in the example above should be replaced with a real username.
+
+To list the available tests:
+
+.. code-block:: console
+
+    $ ./vsperf --list
+
+To run a single test:
+
+.. code-block:: console
+
+    $ ./vsperf $TESTNAME
+
+Where $TESTNAME is the name of the vsperf test you would like to run.
+
+To run a group of tests, for example all tests with a name containing
+'RFC2544':
+
+.. code-block:: console
+
+    $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf --tests="RFC2544"
+
+To run all tests:
+
+.. code-block:: console
+
+    $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf
+
+Some tests allow for configurable parameters, including test duration
+(in seconds) as well as packet sizes (in bytes).
+
+.. code:: bash
+
+    $ ./vsperf --conf-file user_settings.py \
+        --tests RFC2544Tput \
+        --test-params "TRAFFICGEN_DURATION=10;TRAFFICGEN_PKT_SIZES=(128,)"
+
+For all available options, check out the help dialog:
+
+.. code-block:: console
+
+    $ ./vsperf --help
+
+Executing Vanilla OVS tests
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+1. If needed, recompile src for all OVS variants
+
+   .. code-block:: console
+
+       $ cd src
+       $ make distclean
+       $ make
+
+2. Update your ``10_custom.conf`` file to use Vanilla OVS:
+
+   .. code-block:: python
+
+       VSWITCH = 'OvsVanilla'
+
+3. Run test:
+
+   .. code-block:: console
+
+       $ ./vsperf --conf-file=<path_to_custom_conf>
+
+   Please note if you don't want to configure Vanilla OVS through the
+   configuration file, you can pass it as a CLI argument.
+
+   .. code-block:: console
+
+       $ ./vsperf --vswitch OvsVanilla
+
+
+Executing tests with VMs
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+To run tests using vhost-user as guest access method:
+
+1. Set VHOST_METHOD and VNF of your settings file to:
+
+   .. code-block:: python
+
+       VSWITCH = 'OvsDpdkVhost'
+       VNF = 'QemuDpdkVhost'
+
+2. If needed, recompile src for all OVS variants
+
+   .. code-block:: console
+
+       $ cd src
+       $ make distclean
+       $ make
+
+3. Run test:
+
+   .. code-block:: console
+
+       $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf
+
+Executing tests with VMs using Vanilla OVS
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To run tests using Vanilla OVS:
+
+1. Set the following variables:
+
+   .. code-block:: python
+
+       VSWITCH = 'OvsVanilla'
+       VNF = 'QemuVirtioNet'
+
+       VANILLA_TGEN_PORT1_IP = n.n.n.n
+       VANILLA_TGEN_PORT1_MAC = nn:nn:nn:nn:nn:nn
+
+       VANILLA_TGEN_PORT2_IP = n.n.n.n
+       VANILLA_TGEN_PORT2_MAC = nn:nn:nn:nn:nn:nn
+
+       VANILLA_BRIDGE_IP = n.n.n.n
+
+   or use ``--test-params`` option
+
+   .. code-block:: console
+
+       $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf \
+                  --test-params "VANILLA_TGEN_PORT1_IP=n.n.n.n;" \
+                                "VANILLA_TGEN_PORT1_MAC=nn:nn:nn:nn:nn:nn;" \
+                                "VANILLA_TGEN_PORT2_IP=n.n.n.n;" \
+                                "VANILLA_TGEN_PORT2_MAC=nn:nn:nn:nn:nn:nn"
+
+2. If needed, recompile src for all OVS variants
+
+   .. code-block:: console
+
+       $ cd src
+       $ make distclean
+       $ make
+
+3. Run test:
+
+   .. code-block:: console
+
+       $ ./vsperf --conf-file<path_to_custom_conf>/10_custom.conf
+
+.. _vpp-test:
+
+Executing VPP tests
+^^^^^^^^^^^^^^^^^^^
+
+Currently it is not possible to use standard scenario deployments for execution of
+tests with VPP. It means, that deployments ``p2p``, ``pvp``, ``pvvp`` and in general any
+:ref:`pxp-deployment` won't work with VPP. However it is possible to use VPP in
+:ref:`step-driven-tests`. A basic set of VPP testcases covering ``phy2phy``, ``pvp``
+and ``pvvp`` tests are already prepared.
+
+List of performance tests with VPP support follows:
+
+* phy2phy_tput_vpp:              VPP: LTD.Throughput.RFC2544.PacketLossRatio
+* phy2phy_cont_vpp:              VPP: Phy2Phy Continuous Stream
+* phy2phy_back2back_vpp:         VPP: LTD.Throughput.RFC2544.BackToBackFrames
+* pvp_tput_vpp:                  VPP: LTD.Throughput.RFC2544.PacketLossRatio
+* pvp_cont_vpp:                  VPP: PVP Continuous Stream
+* pvp_back2back_vpp:             VPP: LTD.Throughput.RFC2544.BackToBackFrames
+* pvvp_tput_vpp:                 VPP: LTD.Throughput.RFC2544.PacketLossRatio
+* pvvp_cont_vpp:                 VPP: PVP Continuous Stream
+* pvvp_back2back_vpp:            VPP: LTD.Throughput.RFC2544.BackToBackFrames
+
+In order to execute testcases with VPP it is required to:
+
+* install VPP manually, see :ref:`vpp-installation`
+* configure ``WHITELIST_NICS``, with two physical NICs connected to the traffic generator
+* configure traffic generator, see :ref:`trafficgen-installation`
+
+After that it is possible to execute VPP testcases listed above.
+
+For example:
+
+.. code-block:: console
+
+    $ ./vsperf --conf-file=<path_to_custom_conf> phy2phy_tput_vpp
+
+.. _vfio-pci:
+
+Using vfio_pci with DPDK
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To use vfio with DPDK instead of igb_uio add into your custom configuration
+file the following parameter:
+
+.. code-block:: python
+
+    PATHS['dpdk']['src']['modules'] = ['uio', 'vfio-pci']
+
+
+**NOTE:** In case, that DPDK is installed from binary package, then please
+set ``PATHS['dpdk']['bin']['modules']`` instead.
+
+**NOTE:** Please ensure that Intel VT-d is enabled in BIOS.
+
+**NOTE:** Please ensure your boot/grub parameters include
+the following:
+
+.. code-block:: console
+
+    iommu=pt intel_iommu=on
+
+To check that IOMMU is enabled on your platform:
+
+.. code-block:: console
+
+    $ dmesg | grep IOMMU
+    [    0.000000] Intel-IOMMU: enabled
+    [    0.139882] dmar: IOMMU 0: reg_base_addr fbffe000 ver 1:0 cap d2078c106f0466 ecap f020de
+    [    0.139888] dmar: IOMMU 1: reg_base_addr ebffc000 ver 1:0 cap d2078c106f0466 ecap f020de
+    [    0.139893] IOAPIC id 2 under DRHD base  0xfbffe000 IOMMU 0
+    [    0.139894] IOAPIC id 0 under DRHD base  0xebffc000 IOMMU 1
+    [    0.139895] IOAPIC id 1 under DRHD base  0xebffc000 IOMMU 1
+    [    3.335744] IOMMU: dmar0 using Queued invalidation
+    [    3.335746] IOMMU: dmar1 using Queued invalidation
+    ....
+
+.. _SRIOV-support:
+
+Using SRIOV support
+^^^^^^^^^^^^^^^^^^^
+
+To use virtual functions of NIC with SRIOV support, use extended form
+of NIC PCI slot definition:
+
+.. code-block:: python
+
+    WHITELIST_NICS = ['0000:05:00.0|vf0', '0000:05:00.1|vf3']
+
+Where 'vf' is an indication of virtual function usage and following
+number defines a VF to be used. In case that VF usage is detected,
+then vswitchperf will enable SRIOV support for given card and it will
+detect PCI slot numbers of selected VFs.
+
+So in example above, one VF will be configured for NIC '0000:05:00.0'
+and four VFs will be configured for NIC '0000:05:00.1'. Vswitchperf
+will detect PCI addresses of selected VFs and it will use them during
+test execution.
+
+At the end of vswitchperf execution, SRIOV support will be disabled.
+
+SRIOV support is generic and it can be used in different testing scenarios.
+For example:
+
+* vSwitch tests with DPDK or without DPDK support to verify impact
+  of VF usage on vSwitch performance
+* tests without vSwitch, where traffic is forwared directly
+  between VF interfaces by packet forwarder (e.g. testpmd application)
+* tests without vSwitch, where VM accesses VF interfaces directly
+  by PCI-passthrough_ to measure raw VM throughput performance.
+
+.. _PCI-passthrough:
+
+Using QEMU with PCI passthrough support
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Raw virtual machine throughput performance can be measured by execution of PVP
+test with direct access to NICs by PCI passthrough. To execute VM with direct
+access to PCI devices, enable vfio-pci_. In order to use virtual functions,
+SRIOV-support_ must be enabled.
+
+Execution of test with PCI passthrough with vswitch disabled:
+
+.. code-block:: console
+
+    $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf \
+               --vswitch none --vnf QemuPciPassthrough pvp_tput
+
+Any of supported guest-loopback-application_ can be used inside VM with
+PCI passthrough support.
+
+Note: Qemu with PCI passthrough support can be used only with PVP test
+deployment.
+
+.. _guest-loopback-application:
+
+Selection of loopback application for tests with VMs
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To select the loopback applications which will forward packets inside VMs,
+the following parameter should be configured:
+
+.. code-block:: python
+
+     GUEST_LOOPBACK = ['testpmd']
+
+or use ``--test-params`` CLI argument:
+
+.. code-block:: console
+
+        $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf \
+              --test-params "GUEST_LOOPBACK=['testpmd']"
+
+Supported loopback applications are:
+
+.. code-block:: console
+
+     'testpmd'       - testpmd from dpdk will be built and used
+     'l2fwd'         - l2fwd module provided by Huawei will be built and used
+     'linux_bridge'  - linux bridge will be configured
+     'buildin'       - nothing will be configured by vsperf; VM image must
+                       ensure traffic forwarding between its interfaces
+
+Guest loopback application must be configured, otherwise traffic
+will not be forwarded by VM and testcases with VM related deployments
+will fail. Guest loopback application is set to 'testpmd' by default.
+
+**NOTE:** In case that only 1 or more than 2 NICs are configured for VM,
+then 'testpmd' should be used. As it is able to forward traffic between
+multiple VM NIC pairs.
+
+**NOTE:** In case of linux_bridge, all guest NICs are connected to the same
+bridge inside the guest.
+
+Mergable Buffers Options with QEMU
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Mergable buffers can be disabled with VSPerf within QEMU. This option can
+increase performance significantly when not using jumbo frame sized packets.
+By default VSPerf disables mergable buffers. If you wish to enable it you
+can modify the setting in the a custom conf file.
+
+.. code-block:: python
+
+    GUEST_NIC_MERGE_BUFFERS_DISABLE = [False]
+
+Then execute using the custom conf file.
+
+.. code-block:: console
+
+        $ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf
+
+Alternatively you can just pass the param during execution.
+
+.. code-block:: console
+
+        $ ./vsperf --test-params "GUEST_NIC_MERGE_BUFFERS_DISABLE=[False]"
+
+
+Selection of dpdk binding driver for tests with VMs
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To select dpdk binding driver, which will specify which driver the vm NICs will
+use for dpdk bind, the following configuration parameter should be configured:
+
+.. code-block:: console
+
+     GUEST_DPDK_BIND_DRIVER = ['igb_uio_from_src']
+
+The supported dpdk guest bind drivers are:
+
+.. code-block:: console
+
+    'uio_pci_generic'	   - Use uio_pci_generic driver
+    'igb_uio_from_src'     - Build and use the igb_uio driver from the dpdk src
+                             files
+    'vfio_no_iommu'        - Use vfio with no iommu option. This requires custom
+                             guest images that support this option. The default
+                             vloop image does not support this driver.
+
+Note: uio_pci_generic does not support sr-iov testcases with guests attached.
+This is because uio_pci_generic only supports legacy interrupts. In case
+uio_pci_generic is selected with the vnf as QemuPciPassthrough it will be
+modified to use igb_uio_from_src instead.
+
+Note: vfio_no_iommu requires kernels equal to or greater than 4.5 and dpdk
+16.04 or greater. Using this option will also taint the kernel.
+
+Please refer to the dpdk documents at http://dpdk.org/doc/guides for more
+information on these drivers.
+
+Multi-Queue Configuration
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+VSPerf currently supports multi-queue with the following limitations:
+
+1.  Requires QEMU 2.5 or greater and any OVS version higher than 2.5. The
+    default upstream package versions installed by VSPerf satisfies this
+    requirement.
+
+2.  Guest image must have ethtool utility installed if using l2fwd or linux
+    bridge inside guest for loopback.
+
+3.  If using OVS versions 2.5.0 or less enable old style multi-queue as shown
+    in the ''02_vswitch.conf'' file.
+
+    .. code-block:: python
+
+        OVS_OLD_STYLE_MQ = True
+
+To enable multi-queue for dpdk modify the ''02_vswitch.conf'' file.
+
+.. code-block:: python
+
+    VSWITCH_DPDK_MULTI_QUEUES = 2
+
+**NOTE:** you should consider using the switch affinity to set a pmd cpu mask
+that can optimize your performance. Consider the numa of the NIC in use if this
+applies by checking /sys/class/net/<eth_name>/device/numa_node and setting an
+appropriate mask to create PMD threads on the same numa node.
+
+When multi-queue is enabled, each dpdk or dpdkvhostuser port that is created
+on the switch will set the option for multiple queues. If old style multi queue
+has been enabled a global option for multi queue will be used instead of the
+port by port option.
+
+To enable multi-queue on the guest modify the ''04_vnf.conf'' file.
+
+.. code-block:: python
+
+    GUEST_NIC_QUEUES = [2]
+
+Enabling multi-queue at the guest will add multiple queues to each NIC port when
+qemu launches the guest.
+
+In case of Vanilla OVS, multi-queue is enabled on the tuntap ports and nic
+queues will be enabled inside the guest with ethtool. Simply enabling the
+multi-queue on the guest is sufficient for Vanilla OVS multi-queue.
+
+Testpmd should be configured to take advantage of multi-queue on the guest if
+using DPDKVhostUser. This can be done by modifying the ''04_vnf.conf'' file.
+
+.. code-block:: python
+
+    GUEST_TESTPMD_PARAMS = ['-l 0,1,2,3,4  -n 4 --socket-mem 512 -- '
+                            '--burst=64 -i --txqflags=0xf00 '
+                            '--nb-cores=4 --rxq=2 --txq=2 '
+                            '--disable-hw-vlan']
+
+**NOTE:** The guest SMP cores must be configured to allow for testpmd to use the
+optimal number of cores to take advantage of the multiple guest queues.
+
+In case of using Vanilla OVS and qemu virtio-net you can increase performance
+by binding vhost-net threads to cpus. This can be done by enabling the affinity
+in the ''04_vnf.conf'' file. This can be done to non multi-queue enabled
+configurations as well as there will be 2 vhost-net threads.
+
+.. code-block:: python
+
+    VSWITCH_VHOST_NET_AFFINITIZATION = True
+
+    VSWITCH_VHOST_CPU_MAP = [4,5,8,11]
+
+**NOTE:** This method of binding would require a custom script in a real
+environment.
+
+**NOTE:** For optimal performance guest SMPs and/or vhost-net threads should be
+on the same numa as the NIC in use if possible/applicable. Testpmd should be
+assigned at least (nb_cores +1) total cores with the cpu mask.
+
+Executing Packet Forwarding tests
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To select the applications which will forward packets,
+the following parameters should be configured:
+
+.. code-block:: python
+
+    VSWITCH = 'none'
+    PKTFWD = 'TestPMD'
+
+or use ``--vswitch`` and ``--fwdapp`` CLI arguments:
+
+.. code-block:: console
+
+    $ ./vsperf phy2phy_cont --conf-file user_settings.py \
+               --vswitch none \
+               --fwdapp TestPMD
+
+Supported Packet Forwarding applications are:
+
+.. code-block:: console
+
+    'testpmd'       - testpmd from dpdk
+
+
+1. Update your ''10_custom.conf'' file to use the appropriate variables
+   for selected Packet Forwarder:
+
+   .. code-block:: python
+
+      # testpmd configuration
+      TESTPMD_ARGS = []
+      # packet forwarding mode supported by testpmd; Please see DPDK documentation
+      # for comprehensive list of modes supported by your version.
+      # e.g. io|mac|mac_retry|macswap|flowgen|rxonly|txonly|csum|icmpecho|...
+      # Note: Option "mac_retry" has been changed to "mac retry" since DPDK v16.07
+      TESTPMD_FWD_MODE = 'csum'
+      # checksum calculation layer: ip|udp|tcp|sctp|outer-ip
+      TESTPMD_CSUM_LAYER = 'ip'
+      # checksum calculation place: hw (hardware) | sw (software)
+      TESTPMD_CSUM_CALC = 'sw'
+      # recognize tunnel headers: on|off
+      TESTPMD_CSUM_PARSE_TUNNEL = 'off'
+
+2. Run test:
+
+   .. code-block:: console
+
+      $ ./vsperf phy2phy_tput --conf-file <path_to_settings_py>
+
+Executing Packet Forwarding tests with one guest
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+TestPMD with DPDK 16.11 or greater can be used to forward packets as a switch to a single guest using TestPMD vdev
+option. To set this configuration the following parameters should be used.
+
+    .. code-block:: python
+
+        VSWITCH = 'none'
+        PKTFWD = 'TestPMD'
+
+or use ``--vswitch`` and ``--fwdapp`` CLI arguments:
+
+    .. code-block:: console
+
+        $ ./vsperf pvp_tput --conf-file user_settings.py \
+                   --vswitch none \
+                   --fwdapp TestPMD
+
+Guest forwarding application only supports TestPMD in this configuration.
+
+    .. code-block:: python
+
+        GUEST_LOOPBACK = ['testpmd']
+
+For optimal performance one cpu per port +1 should be used for TestPMD. Also set additional params for packet forwarding
+application to use the correct number of nb-cores.
+
+    .. code-block:: python
+
+        DPDK_SOCKET_MEM = ['1024', '0']
+        VSWITCHD_DPDK_ARGS = ['-l', '46,44,42,40,38', '-n', '4']
+        TESTPMD_ARGS = ['--nb-cores=4', '--txq=1', '--rxq=1']
+
+For guest TestPMD 3 VCpus should be assigned with the following TestPMD params.
+
+    .. code-block:: python
+
+        GUEST_TESTPMD_PARAMS = ['-l 0,1,2 -n 4 --socket-mem 1024 -- '
+                                '--burst=64 -i --txqflags=0xf00 '
+                                '--disable-hw-vlan --nb-cores=2 --txq=1 --rxq=1']
+
+Execution of TestPMD can be run with the following command line
+
+    .. code-block:: console
+
+        ./vsperf pvp_tput --vswitch=none --fwdapp=TestPMD --conf-file <path_to_settings_py>
+
+**NOTE:** To achieve the best 0% loss numbers with rfc2544 throughput testing, other tunings should be applied to host
+and guest such as tuned profiles and CPU tunings to prevent possible interrupts to worker threads.
+
+VSPERF modes of operation
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+VSPERF can be run in different modes. By default it will configure vSwitch,
+traffic generator and VNF. However it can be used just for configuration
+and execution of traffic generator. Another option is execution of all
+components except traffic generator itself.
+
+Mode of operation is driven by configuration parameter -m or --mode
+
+.. code-block:: console
+
+    -m MODE, --mode MODE  vsperf mode of operation;
+        Values:
+            "normal" - execute vSwitch, VNF and traffic generator
+            "trafficgen" - execute only traffic generator
+            "trafficgen-off" - execute vSwitch and VNF
+            "trafficgen-pause" - execute vSwitch and VNF but wait before traffic transmission
+
+In case, that VSPERF is executed in "trafficgen" mode, then configuration
+of traffic generator can be modified through ``TRAFFIC`` dictionary passed to the
+``--test-params`` option. It is not needed to specify all values of ``TRAFFIC``
+dictionary. It is sufficient to specify only values, which should be changed.
+Detailed description of ``TRAFFIC`` dictionary can be found at
+:ref:`configuration-of-traffic-dictionary`.
+
+Example of execution of VSPERF in "trafficgen" mode:
+
+.. code-block:: console
+
+    $ ./vsperf -m trafficgen --trafficgen IxNet --conf-file vsperf.conf \
+        --test-params "TRAFFIC={'traffic_type':'rfc2544_continuous','bidir':'False','framerate':60}"
+
+Code change verification by pylint
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Every developer participating in VSPERF project should run
+pylint before his python code is submitted for review. Project
+specific configuration for pylint is available at 'pylint.rc'.
+
+Example of manual pylint invocation:
+
+.. code-block:: console
+
+          $ pylint --rcfile ./pylintrc ./vsperf
+
+GOTCHAs:
+^^^^^^^^
+
+Custom image fails to boot
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Using custom VM images may not boot within VSPerf pxp testing because of
+the drive boot and shared type which could be caused by a missing scsi
+driver inside the image. In case of issues you can try changing the drive
+boot type to ide.
+
+.. code-block:: python
+
+    GUEST_BOOT_DRIVE_TYPE = ['ide']
+    GUEST_SHARED_DRIVE_TYPE = ['ide']
+
+OVS with DPDK and QEMU
+~~~~~~~~~~~~~~~~~~~~~~~
+
+If you encounter the following error: "before (last 100 chars):
+'-path=/dev/hugepages,share=on: unable to map backing store for
+hugepages: Cannot allocate memory\r\n\r\n" during qemu initialization,
+check the amount of hugepages on your system:
+
+.. code-block:: console
+
+    $ cat /proc/meminfo | grep HugePages
+
+
+By default the vswitchd is launched with 1Gb of memory, to  change
+this, modify --socket-mem parameter in conf/02_vswitch.conf to allocate
+an appropriate amount of memory:
+
+.. code-block:: python
+
+    DPDK_SOCKET_MEM = ['1024', '0']
+    VSWITCHD_DPDK_ARGS = ['-c', '0x4', '-n', '4']
+    VSWITCHD_DPDK_CONFIG = {
+        'dpdk-init' : 'true',
+        'dpdk-lcore-mask' : '0x4',
+        'dpdk-socket-mem' : '1024,0',
+    }
+
+Note: Option ``VSWITCHD_DPDK_ARGS`` is used for vswitchd, which supports ``--dpdk``
+parameter. In recent vswitchd versions, option ``VSWITCHD_DPDK_CONFIG`` will be
+used to configure vswitchd via ``ovs-vsctl`` calls.
+
+
+More information
+^^^^^^^^^^^^^^^^
+
+For more information and details refer to the rest of vSwitchPerfuser documentation.
+