Computational grids such as the Information Power Grid, Particle Physics Data Grid, and Earth System Grid depend on TCP to provide reliable communication between nodes across a Wide-Area Network (WAN). Of the available TCP implementations, TCP Reno and its variants are the most widely deployed; however, Reno's performance in computational grids is mediocre at best. Due to conflicting results in the evaluation of TCP implementations, the paper presents a detailed simulation study that unifies the conflicting results and demonstrates the limitations of earlier work. This paper focuses on the two most debated versions of TCP - Reno and Vegas.
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