doc: add limitation for l3fwd-power sample

L3fwd-power app needs vector mode to be disabled in order to work
properly. The app used to work previously, because it was using
Rx scalar function, but now it uses vector function.

Vector mode needs to be disabled to make the app works,
which has been documented in release notes.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/guides/rel_notes/release_16_11.rst b/doc/guides/rel_notes/release_16_11.rst
index 3d93b43..365b5a3 100644 (file)
--- a/doc/guides/rel_notes/release_16_11.rst
+++ b/doc/guides/rel_notes/release_16_11.rst
@@ -202,6 +202,17 @@ Known Issues
 
    This section is a comment. Make sure to start the actual text at the margin.
 
+* **L3fwd-power app does not work properly when Rx vector is enabled.**
+
+  Using some drivers with vector enabled, makes L3fwd-power app not work
+  properly, since the queue monitoring works differently when using
+  scalar compared to vector, making the frequency scaling not to work correctly.
+  In addition, L3fwd-power requires the mbuf to have correct packet type,
+  but in some drivers, the vector mode must be disabled for this.
+
+  Therefore, in order to use L3fwd-power, vector mode should be disabled
+  from the config file.
+
 
 API Changes
 -----------