2016-06-13 16:52, Remy Horton:

The current extended ethernet statistics fetching involve doing several
string operations, which causes performance issues if there are lots of
statistics and/or network interfaces. This patch changes the test-pmd
and proc_info applications to use the new xstats API, and removes
deprecated code associated with the old API.

There is something wrong which lead to this error:
undefined reference to `rte_eth_xstats_get_names'