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Looking at the traceroutes, using Matt's traceroute to measure the RTT to each hop, indicates that this difference starts at the first hop and persists for later hops. See spreadsheet (MTR tab). We therefore made ping measurements from each SLAC MA to its loopback network interface. The measurements were made at the same times to facilitate comparisons. They indicate that the pinger-raspberry.SLAC is ~0.13ms lslower in responding than the pinger.SLAC MA. Thus approximately 1/3rd of the difference in average RTS tro TRIUMF measured by the two SLAC MAs is due to the MA platform itself.
IPDV
PingER's main metric for measuring jitter is the IPDV. A typical IPD distribution from which the IPD is derived is shown below.
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