The impact of network variabilities on TCP clocking schemes

Kuan Ta Chen*, Polly Huang, Chun-Ying Huang, Chin Laung Lei

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


TCP employs a self-clocking scheme that times the sending of packets. In that, the data packets are sent in a burst when the returning acknowledgement packets are received. This self-clocking scheme (also known as ack-clocking) is deemed a key factor to the the burstiness of TCP traffic and the source of various performance problems - high packet loss, long delay, and high delay jitter. Previous work has suggested contradictively the effectiveness of TCP Pacing as a remedy to alleviate the traffic burstiness. In this paper, we analyze systematically and in more robust experiments the impact of network variabilities on the behavior of TCP clocking schemes. We find that 1) aggregated pacing traffic could be burstier than aggregated ack-clocking traffic. Physical explanation and experimental simulations are provided to support this argument. 2) The round-trip time heterogeneity and flow multiplexing significantly influence the behaviors of both ack-clocking and pacing schemes. Evaluating the performance of clocking schemes without considering these effects is prone to inconsistent results. 3) Pacing outperforms ack-clocking in more realistic settings from the traffic burstiness point of view.

Original languageEnglish
Title of host publicationProceedings - IEEE INFOCOM 2005. The Conference on Computer Communications - 24th Annual Joint Conference of the IEEE Computer and Communications Societies
EditorsK. Makki, E. Knightly
Number of pages6
StatePublished - 7 Oct 2005
EventIEEE INFOCOM 2005 - Miami, FL, United States
Duration: 13 Mar 200517 Mar 2005

Publication series

NameProceedings - IEEE INFOCOM
ISSN (Print)0743-166X


ConferenceIEEE INFOCOM 2005
CountryUnited States
CityMiami, FL

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