Design and Realization of Single-Difference Portable End-to-End Latency Measurement (SD-PELM) for Computer Networks
Date Issued
2014
Date
2014
Author(s)
Chao, I-Chun
Abstract
Abstract The end-to-end latency information is valuable to many networked applications and services, such as telecommunication, power utility, automation, and financial systems, that demand stringent Qualify of Service (QoS). To meet the performance requirements of a diverse set of applications and services, there are strong demands to achieve more accurate latency measurement with more precise resolution than ever before. Additionally, it is critical that such timing information can be flexibly and robustly measured without negatively affecting the network operations. It is reasonable that people can control and improve something only if they can measure or observe it. In this dissertation, we investigate the precision issue of end-to- end latency measurement in Ethernet networks, and design high precision measurement solutions to achieve flexible and robust measurements. We then demonstrate few promising applications that utilize the high precision latency information. Specifically, this dissertation proposes the approach of Single-Difference Portable End-to-end Latency Measurement (SD-PELM). The SD calculation in the proposed approach can eliminate major elements of the offset caused by the lower- layer hardware circuits and the effect of synchronization between measured nodes so that the measured latency can be precise in the resolution of nanoseconds. In addition to the improved measurement precision, PELM facilitates the feature of measuring any arbitrary pair of nodes in an Ethernet network without negatively impacting the operations of the measured network. SD-PELM can be regarded as a plug-and-play latency meter. The dissertation demonstrates several promising measurement applications that utilize the proposed SD-PELM. The first application is the precise switch measurement. The result shows that the latency of switch ranging from microsecond to nanosecond can be measured for further uses. The second application is the traffic indicator, which can differentiate the traffic loads between Probing Points (PPs). The traffic indicator demonstrates the capability of SD-PELM to clearly identify traffic loads ranging from few Mbps to hundreds of Mbps.
Subjects
Single-Difference Portable End-to-end Latency Measurement (SD-PELM)
End-to-End Latency
Precision Time Protocol (PTP)
Type
thesis
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