An Investigation into Transport Protocols and Data Transport ...

List of Figures
2.1 The MONARC hierarchy of Tiers for Atlas, with estimated
initial data transfer rates between the different tiers. . . . . . 34
3.1 Throughput across production networks using UDP and TCP
Transport Protocols between CERN and RAL in September
2002. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2 Bottleneck limits of TCP WAN transfers between CERN and
RAL as reported by Web100. . . . . . . . . . . . . . . . . . . 47
4.1 Congestion Collapse . . . . . . . . . . . . . . . . . . . . . . . 51
4.2 TCP header format. . . . . . . . . . . . . . . . . . . . . . . . 52
4.3 Sliding Window of TCP. . . . . . . . . . . . . . . . . . . . . . 54
4.4 Time Evolution of Example TCP Tahoe Trace. . . . . . . . . . 64
4.5 Time Evolution of Example TCP Reno Trace. . . . . . . . . . 67
5.1 Effect of limiting the socket buffer size on TCP goodput. . . . 79
5.2 Effect of TCP performance with different MTU sizes. . . . . . 81
5.3 CPU utilisation with different TCP throughputs. . . . . . . . 83
5.4 Effect of varying RX Interrupt values on CPU load. . . . . . . 87
5.5 Effect of varying TX Interrupt values on CPU load. . . . . . . 89
5.6 Effect of delayed acks upon cwnd dynamics. . . . . . . . . . . 91
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