dpif-netdev: Add percentage of pmd/core used by each rxq.

[ovs.git] / Documentation / howto / dpdk.rst

diff --git a/Documentation/howto/dpdk.rst b/Documentation/howto/dpdk.rst
index 587aaed5b0af1a9b7921dd64ae73280e5313a373..40f9d96496dfb4265af8c8393d84094157af84de 100644 (file)
--- a/Documentation/howto/dpdk.rst
+++ b/Documentation/howto/dpdk.rst
@@ -139,6 +139,17 @@ Core 3: Q1 (80%) |
 Core 7: Q4 (70%) | Q5 (10%)
 core 8: Q3 (60%) | Q0 (30%)
 
+To see the current measured usage history of pmd core cycles for each rxq::
+
+    $ ovs-appctl dpif-netdev/pmd-rxq-show
+
+.. note::
+
+  A history of one minute is recorded and shown for each rxq to allow for
+  traffic pattern spikes. An rxq's pmd core cycles usage changes due to traffic
+  pattern or reconfig changes will take one minute before they are fully
+  reflected in the stats.
+
 Rxq to pmds assignment takes place whenever there are configuration changes
 or can be triggered by using::