doc: add enic Tx improvement in release notes

Signed-off-by: John Daley <johndale@cisco.com>

diff --git a/doc/guides/rel_notes/release_2_2.rst b/doc/guides/rel_notes/release_2_2.rst
index 5636aad52a4352f4f5703a5b6c71a3d68c6562b4..1c02ff6a84faaa93101c4e62340ac1fb82eacc9c 100644 (file)
--- a/doc/guides/rel_notes/release_2_2.rst
+++ b/doc/guides/rel_notes/release_2_2.rst
@@ -74,6 +74,10 @@ New Features
   *  Added support for Jumbo Frames.
   *  Optimize forwarding performance for Chelsio T5 40GbE cards.
 
+* **Improved enic Tx packet rate.**
+
+  Reduced frequency of Tx tail pointer updates to the NIC.
+
 * **Added support for Mellanox ConnectX-4 adapters (mlx5).**
 
   The mlx5 poll-mode driver implements support for Mellanox ConnectX-4 EN