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-Test Environment
-================
-
-Environment Versioning
-----------------------
-
-CSIT test environment versioning has been introduced to track
-modifications of the test environment.
-
-Any benchmark anomalies (progressions, regressions) between releases of
-a DUT application (e.g. VPP, DPDK), are determined by testing it in the
-same test environment, to avoid test environment changes clouding the
-picture.
-
-A mirror approach is introduced to determine benchmarking anomalies due
-to the test environment change. This is achieved by testing the same DUT
-application version between releases of CSIT test system. This works
-under the assumption that the behaviour of the DUT is deterministic
-under the test conditions.
-
-CSIT test environment versioning scheme ensures integrity of all the
-test system components, including their HW revisions, compiled SW code
-versions and SW source code, within a specific CSIT version. Components
-included in the CSIT environment versioning include:
-
-- **HW** Server hardware firmware and BIOS (motherboard, processsor,
-  NIC(s), accelerator card(s)), tracked in CSIT branch in
-  :file:`./docs/lab/<server_platform_name>_hw_bios_cfg.md`, e.g. `Xeon
-  Skylake servers
-  <https://git.fd.io/csit/tree/docs/lab/testbeds_sm_skx_hw_bios_cfg.md#n556>`_.
-- **Linux** Server Linux OS version and configuration, tracked in CSIT
-  Reports in `SUT Settings
-  <https://docs.fd.io/csit/master/report/vpp_performance_tests/test_environment.html#sut-settings-linux>`_
-  and `Pre-Test Server Calibration
-  <https://docs.fd.io/csit/master/report/vpp_performance_tests/test_environment.html#pre-test-server-calibration>`_.
-- **TRex** TRex Traffic Generator version, drivers and configuration
-  tracked in `TG Settings
-  <https://docs.fd.io/csit/master/report/vpp_performance_tests/test_environment.html#tg-settings-trex>`_.
-- **CSIT** CSIT framework code tracked in CSIT release branches.
-
-Following is the list of CSIT versions to date:
-
-- Ver. 1 associated with CSIT rls1908 branch (`HW
-  <https://git.fd.io/csit/tree/docs/lab?h=rls1908>`_, `Linux
-  <https://docs.fd.io/csit/rls1908/report/vpp_performance_tests/test_environment.html#sut-settings-linux>`_,
-  `TRex
-  <https://docs.fd.io/csit/rls1908/report/vpp_performance_tests/test_environment.html#tg-settings-trex>`_,
-  `CSIT <https://git.fd.io/csit/tree/?h=rls1908>`_).
-- Ver. 2 associated with CSIT rls2001 branch (`HW
-  <https://git.fd.io/csit/tree/docs/lab?h=rls2001>`_, `Linux
-  <https://docs.fd.io/csit/rls2001/report/vpp_performance_tests/test_environment.html#sut-settings-linux>`_,
-  `TRex
-  <https://docs.fd.io/csit/rls2001/report/vpp_performance_tests/test_environment.html#tg-settings-trex>`_,
-  `CSIT <https://git.fd.io/csit/tree/?h=rls2001>`_).
-- Ver. 4 associated with CSIT rls2005 branch (`HW
-  <https://git.fd.io/csit/tree/docs/lab?h=rls2005>`_, `Linux
-  <https://docs.fd.io/csit/rls2005/report/vpp_performance_tests/test_environment.html#sut-settings-linux>`_,
-  `TRex
-  <https://docs.fd.io/csit/rls2005/report/vpp_performance_tests/test_environment.html#tg-settings-trex>`_,
-  `CSIT <https://git.fd.io/csit/tree/?h=rls2005>`_).
-
-To identify performance changes due to VPP code development from
-v20.01.0 to v20.05.0, both have been tested in CSIT environment ver. 4
-and compared against each other. All substantial progressions and
-regressions have been marked up with RCA analysis.
-:ref:`vpp_throughput_comparisons` and :ref:`vpp_known_issues`.
-
-CSIT environment ver. 4 has been evaluated against the ver. 2 by
-benchmarking VPP v20.01.0 in both environment versions.
-
-Physical Testbeds
------------------
-
-FD.io CSIT performance tests are executed in physical testbeds hosted by
-:abbr:`LF (Linux Foundation)` for FD.io project. Two physical testbed
-topology types are used:
-
-- **3-Node Topology**: Consisting of two servers acting as SUTs
-  (Systems Under Test) and one server as TG (Traffic Generator), all
-  connected in ring topology.
-- **2-Node Topology**: Consisting of one server acting as SUTs and one
-  server as TG both connected in ring topology.
-
-Tested SUT servers are based on a range of processors including Intel
-Xeon Haswell-SP, Intel Xeon Skylake-SP, Intel Xeon Cascade Lake-SP, Arm,
-Intel Atom. More detailed description is provided in
-:ref:`tested_physical_topologies`. Tested logical topologies are
-described in :ref:`tested_logical_topologies`.
-
-Server Specifications
----------------------
-
-Complete technical specifications of compute servers used in CSIT
-physical testbeds are maintained in FD.io CSIT repository:
-`FD.io CSIT testbeds - Xeon Cascade Lake`_,
-`FD.io CSIT testbeds - Xeon Skylake, Arm, Atom`_ and
-`FD.io CSIT Testbeds - Xeon Haswell`_.