loop
iter.  step         etime=       petime=
----------------------------------------
   1   at "#time"   time1        0
       at "#eth0in" time1        time1

   2   at "#time"   time2        time1
       at "#eth0in" time2-time1  time2

   3   at "#time"   time3        time2
       at "#eth0in" time3-time2  time3