An Investigation into Transport Protocols and Data Transport ...

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9.1. Transfer Tests Across Dedicated Private Wide Area Networks 198 9.1.4 Results: CBR Background Traffic with 10 New- TCP Flows Figure 9.4 shows the goodput of running 10 New-TCP flows against varying amounts of CBR traffic and shows that on both networks, the aggregate goodput of all algorithms were almost identical - including that of Standard TCP on the DataTAG network. Generally, ScalableTCP and H-TCP are able to squeeze a little more out of the available bandwidth than the other algorithms on MB-NG, yet achieved similar rates to HSTCP on DataTAG. ScalableTCP was also able to achieve a little more combined goodput at around 500Mbit/sec CBR background on the long latency link of DataTAG. Figures 9.5 and 9.6 gives a representation of the fairness between the 10 New-TCP flows on the MB-NG and DataTAG respectively. They show boxplots representing the range and quartiles of the achieved mean goodput of the 10 competing New-TCP flows under each CBR background rate. In order to give a comparative analysis of the fairness in each network environment, the box-plots are normalised by the mean goodput of the flows which is plotted on the secondary y-axis. While the aggregate goodput results gathered represent the means and standard deviations on the mean of many iterations of the tests, the figures shown only present that of a single iteration. Under MB-NG the fairness distribution between H-TCP flows was similar to that of Standard TCP. It can be argued that ScalableTCP shows a greater variation in the fairness distribution between flows with less competing background traffic. However, ScalableTCP shows similar fairness to that of the other algorithms at higher background rates (i.e. lower average TCP goodputs). However, it was observed that there was a wider distribution of goodput
9.1. Transfer Tests Across Dedicated Private Wide Area Networks 199 Normalised TCP Goodput (mbit/sec) 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 Mean Goodput 100 90 80 70 60 50 40 30 20 10 Mean TCP Flow Goodput (mbit/sec) Normalised TCP Goodput (mbit/sec) 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 Mean Goodput 100 90 80 70 60 50 40 30 20 10 Mean TCP Flow Goodput (mbit/sec) 0.5 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 CBR Background (mbit/sec) 0 0.5 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 CBR Background (mbit/sec) 0 (a) HSTCP (b) ScalableTCP Normalised TCP Goodput (mbit/sec) 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 Mean Goodput 100 90 80 70 60 50 40 30 20 10 Mean TCP Flow Goodput (mbit/sec) Normalised TCP Goodput (mbit/sec) 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 Mean Goodput 100 90 80 70 60 50 40 30 20 10 Mean TCP Flow Goodput (mbit/sec) 0.5 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 CBR Background (mbit/sec) 0 0.5 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 CBR Background (mbit/sec) 0 (c) H-TCP (d) Standard TCP Figure 9.5: Fairness distributions between 10 New-TCP flows against various Background Loads on MB-NG. under DataTAG for Standard TCP compared to that of HSTCP and H-TCP. This is due to the slow growth of cwnd under this environment which results in a lack of congestion epochs which are required for flows to back-off and converge to fairness. Therefore, the unfairness between Standard TCP flows in the DataTAG environment is more dependent upon the exit value of cwnd after slow start (rather than the dynamic of AIMD) due to the relatively short duration of the tests. These results demonstrate the short term unfairness experienced between Standard TCP flows under high BDP environments. It was observed that ScalableTCP is mostly fair, except for stray flows which achieves approximately 1.5 to 2 times the mean goodput of the other flows. This is demonstrated in the box-plots by the consistent outlier point in each test. However, ScalableTCP shows a much greater variation in average flow goodputs than that of both HSTCP and H-TCP.
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An Investigation into Transport Pro
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Contents List of Figures . . . . .
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Contents 5 4.6 Summary . . . . . .
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Contents 7 8.2 Test Calibration . .
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Contents 9 10.3.5 Further Tests . .
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List of Figures 11 5.7 Effect on cw
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List of Figures 13 8.16 Unfairness
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List of Figures 15 8.32 Friendlines
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List of Figures 17 9.19 Dynamic swi
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List of Figures 19 D.1 Internet pat
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List of Tables 21 A.1 Hardware and
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Publications And Workshops Some of
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1.2. Research Scope 25 • Identifi
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1.4. Dissertation Outline 27 • Id
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Chapter 2 High Energy Particle Phys
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2.2. Analysis Methods 31 the data i
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2.3. Data Volumes and Regional Cent
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2.3. Data Volumes and Regional Cent
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2.4. Data Transfer Requirements 37
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2.5. Summary 39 data, the most impo
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3.1. Data Intercommunication 41 mov
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3.2. Network Monitoring 43 Whilst l
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3.2. Network Monitoring 45 Internet
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3.2. Network Monitoring 47 1 0.8 Bo
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Chapter 4 Transmission Control Prot
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4.1. Overview 51 Throughput Delay L
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4.2. Protocol Description 53 is dep
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4.2. Protocol Description 55 As a r
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4.3. Congestion Control 57 excessiv
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4.3. Congestion Control 59 probe fo
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4.4. Retransmission Timeout 61 tion
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4.5. TCP Variants 63 mechanisms are
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4.5. TCP Variants 65 connection ini
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4.5. TCP Variants 67 20 15 cwnd sst
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4.5. TCP Variants 69 no more acks t
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4.5. TCP Variants 71 [Hoe96]. In bo
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4.5. TCP Variants 73 TCP Timestamps
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4.6. Summary 75 traffic for a parti
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Chapter 5 TCP For High Performance
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5.1. TCP Hardware Requirements 79 G
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5.1. TCP Hardware Requirements 81 1
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5.1. TCP Hardware Requirements 83 C
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5.2. TCP Tuning & Performance Impro
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5.3. Network Aid in Congestion Dete
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5.3. Network Aid in Congestion Dete
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5.4. Analysis of AIMD Congestion Co
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5.5. Summary 109 5.5 Summary Even t
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6.1. Survey of New-TCP Algorithms 1
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6.2. Discussion and Deployment Cons
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6.3. Summary 133 6.3 Summary The re
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Chapter 7 Testing Framework for the
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7.1. Metrics 137 various New-TCP al
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7.1. Metrics 139 assuming equilibri
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7.2. Environment 141 of packets in
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7.2. Environment 143 T 0 B, T T 1 F
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Chapter 8 Systematic Tests of New-T
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Page 149 and 150: 8.1. Methodology 149 Various other
Page 151 and 152: 8.2. Test Calibration 151 Goodput (
Page 153 and 154: 8.2. Test Calibration 153 cwnd and
Page 155 and 156: 8.2. Test Calibration 155 100 1 Agg
Page 157 and 158: 8.2. Test Calibration 157 1000 FAST
Page 159 and 160: 8.3. Results 159 10 100 Total Throu
Page 161 and 162: 8.3. Results 161 14 12 HSTCP 1 α H
Page 163 and 164: 8.3. Results 163 cwnd (packets) 120
Page 165 and 166: 8.3. Results 165 Fraction Bytes Ret
Page 167 and 168: 8.3. Results 167 1200 1000 HTCP 1 H
Page 169 and 170: 8.3. Results 169 This is due to the
Page 171 and 172: 8.3. Results 171 4000 3500 3000 HTC
Page 173 and 174: 8.3. Results 173 800 700 600 Standa
Page 175 and 176: 8.3. Results 175 1 1 Fairness Ratio
Page 177 and 178: 8.3. Results 177 10 100 Total Throu
Page 179 and 180: 8.3. Results 179 1000 Standard TCP
Page 181 and 182: 8.3. Results 181 600 500 Standard T
Page 183 and 184: 8.4. Discussion of Results 183 Asym
Page 185 and 186: 8.4. Discussion of Results 185 New-
Page 187 and 188: 8.4. Discussion of Results 187 Asym
Page 189 and 190: 8.5. Summary 189 The importance of
Page 191 and 192: 9.1. Transfer Tests Across Dedicate
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Page 229 and 230: 9.3. Internet Transfers 229 can cau
Page 231 and 232: 9.3. Internet Transfers 231 Stanfor
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Page 243 and 244: 9.4. Summary 243 performance of sin
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Page 247 and 248: 10.1. Summary 247 PCs. But at 1Gb/s
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10.2. New-TCP Suitability Study 249
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10.2. New-TCP Suitability Study 251
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10.3. Future Directions 253 low ove
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10.3. Future Directions 255 porates
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10.3. Future Directions 257 A more
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10.4. Conclusion 259 This dissertat
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A.1. Data Storage 261 with the choi
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A.1. Data Storage 263 gether with h
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A.1. Data Storage 265 The virtual m
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A.1. Data Storage 267 Read Speed (M
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A.1. Data Storage 269 Read Speed (M
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A.1. Data Storage 271 1600 1600 140
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A.2. Network Interface Cards 273 la
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A.2. Network Interface Cards 275 de
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A.2. Network Interface Cards 277 of
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A.2. Network Interface Cards 279 PC
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A.2. Network Interface Cards 281 70
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A.2. Network Interface Cards 283 Th
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A.2. Network Interface Cards 285 20
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A.2. Network Interface Cards 287 ha
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B.2. Wide Area Network Tests 289 Da
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C.3. DataTAG 291 Cisco 7606 Cisco 7
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Appendix D Network Paths of Interne
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295 ham02gva.datatag.org:192.91.239
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Bibliography 297 [All03] [AMA + 99]
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Bibliography 299 [BPSK96] H. Balakr
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Bibliography 301 [DC02] [ea02] [FF9
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Bibliography 303 [Flo03] [Flo04] S.
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Bibliography 305 [Hoe96] [IET] [Jac
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Bibliography 307 [KRB05] [Lah00] [L
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Bibliography 309 [MHR03] [MM96] M.
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Bibliography 311 [Pos81a] J. Postel
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Bibliography 313 [tePM] IEPM Intern
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