Allow polling of a single network interface to get more accurate rates from interfaces with slow counter updates.
now allows polling of a single network interface to handle the cases where the network counters update rarely, such as with the 10gbit cards in the data concentrators. This allows a more accurate time estimate, since the calculation coincides with a data upate. --poll-iface enables this option. Uses about 12% of one core on the DCs.
Edited by Erik von Reis