mrtg ping probe VS SmokePing

mrtg-ping-probe is a ping probe for MRTG 2.x.  It is used to monitor
the round trip time and packet loss to networked devices.  MRTG uses
its output to generate graphs visualizing minimum and maximum round
trip times or packet loss.

SmokePing is a latency logging and graphing system. It consists of a
daemon process which organizes the latency measurements and a CGI
which presents the graphs.