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The measurements were made between pinger.slac.stanford.edu and pinger-raspberry.slac.stanford.edu and from both pinger.slac.stanford.edu and pinger-raspberry.slac.stanford.edu to targets at varying distances and hence varying minimum RTTs from SLAC.
| Host | Lat | Long | Great Circle distance from SLAC | Min RTT (as constrained by speed of light in fibre) | Directivity based on measured min RTT |
|---|---|---|---|---|---|
| pinger.slac.stanford.edu | 37.4190 N | 122.2085 W | 0 km | 0 ms | |
| pinger-raspberry.slac.stanford.edu | 37.4190 N | 122.2085 W | 0 km | 0 ms | |
| sitka.triumf.ca | 49.2475 N | 123.2308 W | 1319.6 km | 13.196 ms | 0.6 |
| ping.cern.ch | 46.23 N | 6.07 E | 9390.6 km | 93.90 ms | 0.63 |
Analysis
Looking for significant differences in the measurements of the more important metrics (minimum, average, median and jitter of RTT and loss) that impact applications such as throughput, voice over IP, streaming video, haptics.
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