Probing the latencies of software timestamping

Villain, B; Davis, M; Ridoux, J; Veitch, D; Normand, N

Probing the latencies of software timestamping

Villain, B Davis, M Ridoux, J Veitch, D

Normand, N

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Publication Type:: Conference Proceeding
Citation:: ISPCS 2012 - 2012 International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings, 2012, pp. 1 - 6
Issue Date:: 2012-12-05

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Field	Value	Language
dc.contributor.author	Villain, B	en_US
dc.contributor.author	Davis, M	en_US
dc.contributor.author	Ridoux, J	en_US
dc.contributor.author	Veitch, D https://orcid.org/0000-0001-8163-3464	en_US
dc.contributor.author	Normand, N	en_US
dc.date.issued	2012-12-05	en_US
dc.identifier.citation	ISPCS 2012 - 2012 International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings, 2012, pp. 1 - 6	en_US
dc.identifier.isbn	9781457717154	en_US
dc.identifier.uri	http://hdl.handle.net/10453/120908
dc.description.abstract	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 common timestamping locations in the FreeBSD Operating System. We report on how these latency components react to stress patterns of different kinds, and determine which timestamping strategies result in the lowest latency, and the smallest in-host asymmetry. Our results can be used to improve timestamping and timekeeping for software clocks. © 2012 IEEE.	en_US
dc.relation.ispartof	ISPCS 2012 - 2012 International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings	en_US
dc.relation.isbasedon	10.1109/ISPCS.2012.6336623	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Probing the latencies of software timestamping	en_US
dc.type	Conference Proceeding
utslib.for	1005 Communications Technologies	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - GBDTC - Global Big Data Technologies
utslib.copyright.status	closed_access	*
pubs.publication-status	Published	en_US

Abstract:

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 common timestamping locations in the FreeBSD Operating System. We report on how these latency components react to stress patterns of different kinds, and determine which timestamping strategies result in the lowest latency, and the smallest in-host asymmetry. Our results can be used to improve timestamping and timekeeping for software clocks. © 2012 IEEE.

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http://hdl.handle.net/10453/120908