1. Getting Started with ‘vsperf’

1.1. 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”.

If you want to use another traffic generator, please select the Dummy generator option as shown in Traffic generator instructions

1.2. VSPERF Installation

To see the supported Operating Systems, vSwitches and system requirements, please follow the installation instructions to install.

1.3. Traffic Generator Setup

Follow the Traffic generator instructions to install and configure a suitable traffic generator.

1.4. 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:

$ 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)
  • OVS with vhost_cuse s the guest access method (with DPDK support)

The vhost_user build will reside in src/ovs/ The vhost_cuse build will reside in vswitchperf/src_cuse 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:

$ make clobber

1.5. 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.

1.6. 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.

$ ./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. Command line arguments
  2. Environment variables
  3. Configuration file(s)

1.7. vloop_vnf

vsperf uses a VM called vloop_vnf for looping traffic in the PVP and PVVP deployment scenarios. The image can be downloaded from http://artifacts.opnfv.org/.

$ wget http://artifacts.opnfv.org/vswitchperf/vloop-vnf-ubuntu-14.04_20151216.qcow2

vloop_vnf forwards traffic through a VM using one of: * DPDK testpmd * Linux Bridge * l2fwd kernel Module.

Alternatively you can use your own QEMU image.

1.8. 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

1.9. Executing tests

Before running any tests make sure you have root permissions by adding the following line to /etc/sudoers:

username ALL=(ALL)       NOPASSWD: ALL

username in the example above should be replaced with a real username.

To list the available tests:

$ ./vsperf --list

To run a single test:

$ ./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’:

$ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf --tests="RFC2544"

To run all tests:

$ ./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).

$ ./vsperf --conf-file user_settings.py
    --tests RFC2544Tput
    --test-param "duration=10;pkt_sizes=128"

For all available options, check out the help dialog:

$ ./vsperf --help

1.10. Executing Vanilla OVS tests

  1. If needed, recompile src for all OVS variants
$ cd src
$ make distclean
$ make

2. Update your ‘‘10_custom.conf’’ file to use the appropriate variables for Vanilla OVS:

VSWITCH = 'OvsVanilla'

Where $PORT1 and $PORT2 are the Linux interfaces you’d like to bind to the vswitch.

  1. Run test:
$ ./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; BUT you must set the ports.

$ ./vsperf --vswitch OvsVanilla

1.11. Executing PVP and PVVP tests

To run tests using vhost-user as guest access method:

  1. Set VHOST_METHOD and VNF of your settings file to:
VNF = 'QemuDpdkVhost'
  1. If needed, recompile src for all OVS variants
$ cd src
$ make distclean
$ make
  1. Run test:
$ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf

To run tests using vhost-cuse as guest access method:

  1. Set VHOST_METHOD and VNF of your settings file to:
VNF = 'QemuDpdkVhostCuse'
  1. If needed, recompile src for all OVS variants
$ cd src
$ make distclean
$ make
  1. Run test:
$ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf

1.12. Executing PVP tests using Vanilla OVS

To run tests using Vanilla OVS:

  1. Set the following variables:
VSWITCH = 'OvsVanilla'
VNF = 'QemuVirtioNet'

VANILLA_TGEN_PORT1_MAC = nn:nn:nn:nn:nn:nn

VANILLA_TGEN_PORT2_MAC = nn:nn:nn:nn:nn:nn


or use --test-param

$ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf
           --test-param "vanilla_tgen_tx_ip=n.n.n.n;
  1. If needed, recompile src for all OVS variants
$ cd src
$ make distclean
$ make
  1. Run test:
$ ./vsperf --conf-file<path_to_custom_conf>/10_custom.conf

1.13. Selection of loopback application for PVP and PVVP tests

To select loopback application, which will perform traffic forwarding inside VM, following configuration parameter should be configured:

GUEST_LOOPBACK = ['testpmd', 'testpmd']

or use –test-param

$ ./vsperf --conf-file=<path_to_custom_conf>/10_custom.conf
      --test-param "guest_loopback=testpmd"

Supported loopback applications are:

'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 PVP and PVVP deployments will fail. Guest loopback application is set to ‘testpmd’ by default.

1.14. Executing Packet Forwarding tests

To select application, which will perform packet forwarding, following configuration parameter should be configured:

VSWITCH = 'none'

or use --vswitch and --fwdapp

$ ./vsperf --conf-file user_settings.py
         --vswitch none
         --fwdapp TestPMD

Supported Packet Forwarding applications are:

'testpmd'       - testpmd from dpdk

1. Update your ‘‘10_custom.conf’’ file to use the appropriate variables for selected Packet Forwarder:

# testpmd configuration
# packet forwarding mode: io|mac|mac_retry|macswap|flowgen|rxonly|txonly|csum|icmpecho
# checksum calculation layer: ip|udp|tcp|sctp|outer-ip
# checksum calculation place: hw (hardware) | sw (software)
# recognize tunnel headers: on|off
  1. Run test:
$ ./vsperf --conf-file <path_to_settings_py>

1.15. 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

-m MODE, --mode MODE  vsperf mode of operation;
        "normal" - execute vSwitch, VNF and traffic generator
        "trafficgen" - execute only traffic generator
        "trafficgen-off" - execute vSwitch and VNF

In case, that VSPERF is executed in “trafficgen” mode, then configuration of traffic generator should be configured through –test-param option. Supported CLI options useful for traffic generator configuration are:

'traffic_type'  - One of the supported traffic types. E.g. rfc2544,
                  back2back or continuous
                  Default value is "rfc2544".
'bidirectional' - Specifies if generated traffic will be full-duplex (true)
                  or half-duplex (false)
                  Default value is "false".
'iload'         - Defines desired percentage of frame rate used during
                  continuous stream tests.
                  Default value is 100.
'multistream'   - Defines number of flows simulated by traffic generator.
                  Value 0 disables MultiStream feature
                  Default value is 0.
'stream_type'   - Stream Type is an extension of the "MultiStream" feature.
                  If MultiStream is disabled, then Stream Type will be
                  ignored. Stream Type defines ISO OSI network layer used
                  for simulation of multiple streams.
                  Default value is "L4".

Example of execution of VSPERF in “trafficgen” mode:

$ ./vsperf -m trafficgen --trafficgen IxNet --conf-file vsperf.conf
    --test-params "traffic_type=continuous;bidirectional=True;iload=60"

1.16. 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:

$ pylint --rcfile ./pylintrc ./vsperf

1.17. GOTCHAs:

1.17.1. 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 memoryrnrn” with the PVP or PVVP deployment scenario, check the amount of hugepages on your system:

$ 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:

VSWITCHD_DPDK_ARGS = ['-c', '0x4', '-n', '4', '--socket-mem 1024,0']