docs: add vm2vm testing methodology

Change-Id: I8a89ee3eedd3b439f0243eaef2fafc50ee807739
Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/docs/requirements/vswitchperf_ltp.rst b/docs/requirements/vswitchperf_ltp.rst
index e4e31261..c6692d9a 100644
--- a/docs/requirements/vswitchperf_ltp.rst
+++ b/docs/requirements/vswitchperf_ltp.rst
@@ -1241,6 +1241,48 @@ platform should be configured for every test after this
 (# of vCPUs, vNICs, Memory, affinitization…) is how it should be
 configured for every test that uses a VNF after this.
 
+**Methodology to benchmark the VNF to vSwitch to VNF deployment scenario**
+
+vsperf has identified the following concerns when benchmarking the VNF to
+vSwitch to VNF deployment scenario:
+
+* The accuracy of the timing synchronization between VNFs/VMs.
+* The clock accuracy of a VNF/VM if they were to be used as traffic generators.
+* VNF traffic generator/receiver may be using resources of the system under
+  test, causing at least three forms of workload to increase as the traffic
+  load increases (generation, switching, receiving).
+
+The recommendation from vsperf is that tests for this sceanario must
+include an external HW traffic generator to act as the tester/traffic transmitter
+and receiver. The perscribed methodology to benchmark this deployment scanrio with
+an external tester involves the following three steps:
+
+#. Determine the forwarding capability and latency through the virtual interface
+connected to the VNF/VM.
+
+.. Figure:: vm2vm_virtual_interface_benchmark.png
+
+   Virtual interfaces performance benchmark
+
+#. Determine the forwarding capability and latency through the VNF/hypervisor.
+
+.. Figure:: vm2vm_hypervisor_benchmark.png
+
+   Hypervisor performance benchmark
+
+#. Determine the forwarding capability and latency for the VNF to vSwitch to VNF
+   taking the information from the previous two steps into account.
+
+.. Figure:: vm2vm_benchmark.png
+
+   VNF to vSwitch to VNF performance benchmark
+
+vsperf also identified an alternative configuration for the final step:
+
+.. Figure:: vm2vm_alternative_benchmark.png
+
+   VNF to vSwitch to VNF alternative performance benchmark
+
 .. 3.3.2:
 
 Environment/infrastructure