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CP丢包对带宽性能的影响分析(Analysing TCP performance when link experiencing
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CP丢包对带宽性能的影响分析(Analysing TCP performance when link experiencing packet loss) CP丢包对带宽性能的影响分析(Analysing TCP performance when link experiencing packet loss) CP丢包对带宽性能的影响分析(Analysing TCP performance when link experiencing packet loss)
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Chalmers University of Technology
University of Gothenburg
Department of Computer Science and Engineering
Göteborg, Sweden, October 2013
Analysing TCP performance when link experiencing
packet loss
Master of Science Thesis [in the Programme Networks and Distributed
System]
SHAHRIN CHOWDHURY
KANIZ FATEMA
The Author grants to Chalmers University of Technology and University of Gothenburg
the non-exclusive right to publish the Work electronically and in a non-commercial
purpose make it accessible on the Internet.
The Author warrants that he/she is the author to the Work, and warrants that the Work
does not contain text, pictures or other material that violates copyright law.
The Author shall, when transferring the rights of the Work to a third party (for example a
publisher or a company), acknowledge the third party about this agreement. If the Author
has signed a copyright agreement with a third party regarding the Work, the Author
warrants hereby that he/she has obtained any necessary permission from this third party to
let Chalmers University of Technology and University of Gothenburg store the Work
electronically and make it accessible on the Internet.
Analysing TCP performance when link experiencing packet loss
SHAHRIN CHOWDHURY,
KANIZ FATEMA
© SHAHRIN CHOWDHURY, October 2013.
© KANIZ FATEMA, October 2013.
Examiner: TOMAS OLOVSSON
Chalmers University of Technology
University of Gothenburg
Department of Computer Science and Engineering
SE-412 96 Göteborg
Sweden
Telephone + 46 (0)31-772 1000
Department of Computer Science and Engineering
Göteborg, Sweden October 2013
Acknowledgement
We are grateful to our supervisor and examiner Tomas Olovsson for his valuable time and
assistance in compilation for this thesis. We would like to pay our gratitude to CHALMERS
for providing us necessary equipment. We would also like to thank the Department of
Networks and Distributed Systems for giving us the opportunity to perform our thesis in the
department. Last but not the least we are grateful to our parents for encouraging us to achieve
our goal.
Abstract
TCP is a reliable protocol which is capable of handling retransmission and packet loss. In
TCP, packet loss is not expected to have a noticeable impact on bandwidth. However,
performance was affected even at low packet loss rates (1%) and with an increased rate of
packet loss, a drastic drop was observed. To uncover the cause of this unexpected behavior of
TCP, a deep analysis of TCP has been accomplished.
In this paper we have done a comparison between three different congestion control
algorithms (Cubic, Reno and H_TCP) and a deeper analysis of Reno by means of several
experimental tests in when the link experiences Data loss and ACK loss. Initially different
TCP congestion control algorithms were used to observe their influence on bandwidth rate.
Subsequently the TCP variables i.e. advanced window scaling, ECN value, window scaling,
TCP no-metric-save value were changed to examine their role in obtaining adequate
bandwidth rate with respect to packet drop. In addition to our experimental results, we also
include some possible reasons behind the drastic drop in performance rate which was
observed. Moreover, experimental results show that the congestion control algorithm H-TCP
performed better than Cubic and Reno while link was experiencing packet loss. However,
ACK loss didn‟t affect performance that much, and up to 50% loss of ACKs could be
tolerated with almost no performance degradation.
Keywords: TCP congestion control algorithms, TCP variables, Data loss, ACK loss, Packet
loss, Bandwidth rate etc.
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