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Another concern was the fact that the most comprehensive/complete set of measurements was from the SLAC site which measured over 600 hosts. Most other monitors, monitor 200 or fewer hosts. Thus there is a bias that measurements that rely on distance (e.g. RTT) will have better performance if they are close to SLAC. With the current version of PingER we can centrally maintain a list of Beacons (remote hosts that are monitored by all monitor hosts) and automatically update the monitors with the current Beacons on a daily basis. There are competing concerns regarding increasing the hosts monitored. Each monitor/remote pair adds an extra 100bits/s to the network. Some countries with monitors, such as Palestine have limited bandwidth available. Thus though we need to increase the Beacon list, we need to do this carefully so we do not abuse monitors or remote hosts in countries with poor connectivity. Therefore, for each country with reasonable connectivity one host is selected that is reliable (based on previous PingER measurements), and represents the country. In addition for sites with limited connectivity we will restrivy the ping sizes to 100 Bytes rather than both 100 & 1000 Bytes, i.e. a reduction in traffic by a factor of 10. The idea is to come up with a list of about 120 Beacons covering most countries, thus roughly doubling our current list. For more on this see PingER Beacons Expansion.
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Comparing this to the GDP/capita we get the scatter plot below. The correlation is seen to be moderate to strong (R2 ~ 0.59). The figure also identifies some of the major outliers. Those countries below the line are usually well developed but hard to get to countries (such as Finland, Iceland) or wealthy countries that have not full developed their Internet access (e.g. UAE)
Comparisons with loss, jitter and unreachability are shown below:
Throughput vs Jitter | Throughput vs Loss | Throughput vs Unreachability |
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Comparisons with the DOI are shown below:
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