Cristel Pelsser's blog


On the Suitability of ping to Measure Latency

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While trying to detect the effect of routing configuration changes on network performance, we observed high RTT variability in ping measurements. We took a closer look and found stable per-flow RTTs but significant RTT difference between flows. The figure illustrates this finding. It shows the cumulation distribution of RTTs measured from Dallas to Ashburn. The red staircase is obtained with ping. The vertical curves are the RTT distributions observed for different flow ids.

CDF of RTTs between Dallas and Ashburn

More information on our experiments can be found in RIPE 66 or NANOG 58 presentations. See Olivier Bonaventure’s blog post for a brief explanation of ping and flow-based hashing.

The code to run the measurements is here.

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June 19th, 2013 at 12:33 pm

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