X-Git-Url: https://gerrit.fd.io/r/gitweb?p=csit.git;a=blobdiff_plain;f=docs%2Fcpta%2Fintroduction%2Findex.rst;h=76aed6bbcd35058480e7b43a1ea1adcc7836112d;hp=df47dc5cd99047acd2bf57b41a5a8c5e24485a0b;hb=084295259c8c400068b12add325830388fffe0ba;hpb=0f662ea0defa9b30fa7a7d9256857fce92d20a6e

diff --git a/docs/cpta/introduction/index.rst b/docs/cpta/introduction/index.rst
index df47dc5cd9..76aed6bbcd 100644
--- a/docs/cpta/introduction/index.rst
+++ b/docs/cpta/introduction/index.rst
@@ -1,35 +1,42 @@
-VPP MRR Performance Dashboard
-=============================
+VPP Performance Dashboard
+=========================
 
 Description
 -----------
 
-Dashboard tables list a summary of per test-case VPP MRR performance
-trend and trend compliance metrics, and detected number of anomalies.
-Data samples come from the CSIT VPP trending MRR jobs executed twice a
-day, every 12 hrs (02:00, 14:00 UTC). All trend and anomaly evaluation
-is based on a rolling window of <N=14> data samples, covering last 7
-days.
-
-Legend to table:
-
-    - **Test Case** : name of CSIT test case, naming convention in
-      `CSIT wiki <https://wiki.fd.io/view/CSIT/csit-test-naming>`_.
-    - **Trend [Mpps]** : last value of trend.
-    - **Short-Term Change [%]** : Relative change of last trend value vs. last
-      week trend value.
-    - **Long-Term Change [%]** : Relative change of last trend value vs. maximum
-      of trend values over the last quarter except last week.
-    - **Regressions [#]** : Number of regressions detected.
-    - **Progressions [#]** : Number of progressions detected.
-    - **Outliers [#]** : Number of outliers detected.
-
-All trend and anomaly calculations are defined in :ref:`trending_methodology`.
+Performance dashboard tables provide the latest VPP throughput trend,
+trend compliance and detected anomalies, all on a per VPP test case
+basis.  Linked trendline graphs enable further drill-down into the
+trendline compliance, sequence and nature of anomalies, as well as
+pointers to performance test builds/logs and VPP (or DPDK) builds.
+Performance trending is currently based on the Maximum Receive Rate (MRR) tests.
+MRR tests measure the packet forwarding rate under the maximum load offered
+by traffic generator over a set trial duration, regardless of packet
+loss. See :ref:`trending_methodology` section for more detail including
+trend and anomaly calculations.
+
+Data samples are generated by the CSIT VPP (and DPDK) performance trending jobs
+executed twice a day (target start: every 12 hrs, 02:00, 14:00 UTC). All
+trend and anomaly evaluation is based on an algorithm which divides test runs
+into groups according to minimum description length principle.
+The trend value is the population average of the results within a group.
+
+Legend to the tables:
+
+    - **Test Case**: name of FD.io CSIT test case, naming convention
+      `here <https://wiki.fd.io/view/CSIT/csit-test-naming>`_.
+    - **Trend [Mpps]**: last value of performance trend.
+    - **Short-Term Change [%]**: Relative change of last trend value
+      vs. last week trend value.
+    - **Long-Term Change [%]**: Relative change of last trend value vs.
+      maximum of trend values over the last quarter except last week.
+    - **Regressions [#]**: Number of regressions detected.
+    - **Progressions [#]**: Number of progressions detected.
 
 Tested VPP worker-thread-core combinations (1t1c, 2t2c, 4t4c) are listed
 in separate tables in section 1.x. Followed by trending methodology in
-section 2. and daily trending graphs in sections 3.x. Daily trending
-data used is provided in sections 4.x.
+section 2. and trendline graphs in sections 3.x. Performance test  data
+used for trendline graphs is provided in sections 4.x.
 
 VPP worker on 1t1c
 ------------------