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Dealing effectively with latency is the key to accurate and reliable timekeeping over networks. Software components of timekeeping, including synchronisation algorithms such as ntpd, RADclock, and ptpd, must deal with the significant and highly variable latencies inherent to common operating systems. Using the DTrace system profiling tool, we provide an accurate breakdown of the latencies between...
Internet services rely on communication networks to serve billions of end-users worldwide. Metrology platforms are used to assess the Quality of Service of such networks. This work reviews and classifies the existing metrology equipment and methods. In particular, we provide elements of comparison between different packet capture techniques and clock synchronisation methods, two essential building...
Variable latencies due to communication delays or system noise is the central challenge faced by time-keeping algorithms when synchronizing over the network. Using extensive experiments, we explore the robustness of synchronization in the face of both normal and extreme latency variability and compare the feedback approaches of ntpd and ptpd (a software implementation of IEEE-1588) to the feed-forward...
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