Ping is simple utility which Pinger uses for analyzing the connectivity of nodes. Sometimes the* problem is that many hosts do not give high priority to pings and many block it. This results in high RTT for pings. It is a big difference for closer hosts than far hosts.In order to find the difference if exist, we recorded response time of pings vs HTTP hosts from SLAC to other hosts. see here*
Interesting We found that the relative difference is quite small. Relative difference is a ratio between ping time and HTTP time responses. 
we took Relative difference as Pingminrtt-httpminrtt/(0.5* (Pingminrtt+httpminrtt)). it helps in finding how big the difference is in ping RTT relative to HTTP RTT
The x-axis shows the ranges of realtive differences between min and max of relative difference.Left Yaxis is the number of times the difference exist in between the ranges.The right Yaxis is cumulative %age which shows what percentage of the total,a particular interval value is occurring
So mostly difference are quite small as we can see from x-axis bin intervals. More over, most of the nodes are having differences around 0 which confirms that there is no such significant difference occurs if we use ping or http.Most of the