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This is a study of the differences (if any) of the measurements from pinger.slac.stanford.edu (a single (raw bare hardware non-virtual) Linux host (Dell PowerEdge 2650) running the PingER Measurement Agent (MA) measuring the ping Round Trip Times (RTTs) to and pingervm (AKA dhcp-nebula-124-66.slac.stanford.edu a Nebulr KVM Virtual Machine) and vice versaa Nebula KVM Virtual Machine) MA measuring the ping Round Trip Times (RTTs) to hosts worldwide and between pinger and pingervm. Hencefiorth we refer to ping requests from pinger to pingervm as pinger to pingervm or pinger>pingervm and ping requests from pingervm to pinger as pinger to pingervm or pingervm>pinger. Both pinger and pingervm are located on the second floor of Building 50 (the computer center) at SLAC. The traceroutes between the two machines are seen here.
The measurements were made from February 26th 2015 and March 3rd 2015. Every ~30 minutes a burst of 10-30 (10 if no loss else up to 30 until 10 ping responses were received) ping requests was sent by the MA to the target. The ping packet size was 100Bytes, the ping requests in the burst were separated by 1 second. The number of pings between pinger and pingervm was ~3000.
To World (excluding SLAC targets).
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By looking at the cumulative distributions we can get the Median differences probability.
Minimum RTT distributions between pinger and pingervm
We focus on the minimum RTT since that is least affected by queuing etc.
