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First International Workshop
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Talk Sylvain Ravot, Caltech, USA Title: GridDT Abstract: In High Energy Physics, data-intensive applications require high file transfer performance over high bandwidth-delay networks. In order to take advantage of new backbone capacities, which are advancing rapidly to 10 Gbit/s, there is a clear and urgent need for a transport protocol that provides more than 1 Gbit/s of throughput end-to-end. TCP is the most common solution for reliable data transfers over IP networks. Although TCP has demonstrated a remarkable ability to adapt to vastly different networks, recent theoretical and experimental results have shown that TCP becomes inefficient when the bandwidth and the latency increase. The current additive increase policy limits its ability to use spare bandwidth. To address this problem, we wrote a Linux patch called “GridDT” which allows users to tune AIMD parameters. By changing these parameters, we can reproduce the behavior of a multi-stream transfer with a single stream and can virtually increase the MTU. In this talk, we present our new algorithm and compare it to the standard implementation of TCP in Linux 2.4.19. We also explain how this algorithm impacts the network and illustrate its fairness by studying practical examples.
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