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WorldCist'18 - 6th World Conference on Information Systems and Technologies

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How Insufficient Send Socket Buffer Affects MPTCP Performance over Paths with Different Delay

Recently, the multipath transport protocol such as Multipath TCP becomes increasingly important. It allows more than one TCP connections via different paths to compose one Multipath TCP communication. However, it has some problems when those paths have different delay. Especially, the limited buffer space at either sender or receiver may degrade the throughput due to head-of-line blocking. Our previous paper pointed out that insufficient send socket buffer and receive socket buffer provide different situations of performance degradation, and that insufficient send socket buffer gives poorer throughput. This paper extends the performance analysis of our previous paper in the conditions with various combinations of send socket buffer size and transmission delay. It gives more detailed analysis using Multipath TCP level sequence number and congestion window size, and suggests the reasons for performance degradation.

Toshihiko Kato
University of Electro-Communications
Japan

Adhikari Diwakar
University of Electro-Communications
Japan

Ryo Yamamoto
University of Electro-Communications
Japan

Satoshi Ohzahata
University of Electro-Communications
Japan

 

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