Robust synchronization of software clocks across the internet
Proceedings of the 4th ACM SIGCOMM conference on Internet measurement
A distributed passive measurement infrastructure
PAM'05 Proceedings of the 6th international conference on Passive and Active Network Measurement
Influence of the packet size on the one-way delay on the down-link in 3G networks
ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing
WiMax quality-of-service estimations and measurement
Computer Communications
HATS: high accuracy timestamping system based on NetFPGA
AST/UCMA/ISA/ACN'10 Proceedings of the 2010 international conference on Advances in computer science and information technology
Network performance engineering
OFLOPS: an open framework for openflow switch evaluation
PAM'12 Proceedings of the 13th international conference on Passive and Active Measurement
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Due to the complex diversity of contemporary Internet applications, computer network measurements have gained considerable interest during the recent years. Since they supply network research, development and operations with data important for network traffic modelling, performance and trend analysis etc., the quality of these measurements affect the results of these activities and thus the perception of the network and its services. One major source of error is the timestamp accuracy obtained from measurement hardware and software. On this background, we present a method that can estimate the timestamp accuracy obtained from measurement hardware and software. The method is used to evaluate the timestamp accuracy of some commonly used measurement hardware and software. Results are presented for the Agilent J6800/J6830A measurement system, the Endace DAG 3.5E card, the Packet Capture Library (PCAP) either with PF_RING or Memory Mapping, and a RAW socket using either the kernel PDU timestamp (ioctl) or the CPU counter (TSC) to obtain timestamps.