docs: TRex static documentation

Signed-off-by: Viliam Luc <vluc@cisco.com>
Change-Id: I41233f7044574505f32f7425fd897bb3176ac839

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+To identify performance changes due to VPP code development between previous
+and current VPP release version, both have been tested in CSIT environment of
+latest version and compared against each other. All substantial progressions and
+regressions have been marked up with RCA analysis. See
+:ref:`vpp_throughput_comparisons` and :ref:`vpp_known_issues`.
+
+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
+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`_.