Merge "dpdkstat: userguide updated with dpdkstat init notice"

diff --cc docs/release/userguide/feature.userguide.rst
index c71af19,e814895..53c1937
--- 1/docs/release/userguide/feature.userguide.rst
--- 2/docs/release/userguide/feature.userguide.rst
+++ b/docs/release/userguide/feature.userguide.rst
@@@ -190,9 -190,15 +190,15 @@@ https://github.com/collectd/collectd/bl
   you will need to specify the specific paths to the header files and libraries
   using LIBDPDK_CPPFLAGS and LIBDPDK_LDFLAGS. You will also need to add the DPDK
   library symbols to the shared library path using ldconfig. Note that this
 - update to the shared library path is not persistant (i.e. it will not survive a
 + update to the shared library path is not persistent (i.e. it will not survive a
   reboot).
  
+ .. note:: Plugin initialization time depends on read interval. It requires
+  5 read cycles to set up internal buffers and states. During that time
+  no statistics are submitted. Also if plugin is running and the number of DPDK
+  ports is increased, internal buffers are resized. That requires 3 read cycles
+  and no port statistics are submitted in that time.
+ 
  DPDK events plugin
  ^^^^^^^^^^^^^^^^^^^^^^
  Repo: https://github.com/collectd/collectd