An Investigation into Transport Protocols and Data Transport ...

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9.1. Transfer Tests Across Dedicated Private Wide Area Networks 206 800 700 cwnd ssthresh 800 700 cwnd ssthresh cwnd and ssthresh (packets) 600 500 400 300 200 cwnd and ssthresh (packets) 600 500 400 300 200 100 100 0 10 12 14 16 18 20 Time (seconds) 0 10 12 14 16 18 20 Time (seconds) (a) HSTCP with 200Mbit/sec BG (b) HSTCP with 600Mbit/sec BG 800 700 cwnd ssthresh 800 700 cwnd ssthresh cwnd and ssthresh (packets) 600 500 400 300 200 cwnd and ssthresh (packets) 600 500 400 300 200 100 100 0 10 12 14 16 18 20 Time (seconds) (c) ScalableTCP with 200Mbit/sec BG 0 10 12 14 16 18 20 Time (seconds) (d) ScalableTCP with 600Mbit/sec BG 800 700 cwnd ssthresh 800 700 cwnd ssthresh cwnd and ssthresh (packets) 600 500 400 300 200 cwnd and ssthresh (packets) 600 500 400 300 200 100 100 0 10 12 14 16 18 20 Time (seconds) 0 10 12 14 16 18 20 Time (seconds) (e) H-TCP with 200Mbit/sec BG (f) H-TCP with 600Mbit/sec BG Figure 9.12: cwnd trace of New-TCP algorithms with various CBR Background Traffic loads on MB-NG. were not associated with time-outs. This effect is more pronounced with the DataTAG results (See Figure 9.3(b)), whereby a large dip in goodput was experienced for all algorithms in the region between 100Mbit/sec and 400Mbit/sec CBR background. Figure 9.13 shows the large variation of cwnd dynamics of New-TCP al-
9.1. Transfer Tests Across Dedicated Private Wide Area Networks 207 8000 7000 cwnd ssthresh 8000 7000 cwnd ssthresh cwnd and ssthresh (packets) 6000 5000 4000 3000 2000 cwnd and ssthresh (packets) 6000 5000 4000 3000 2000 1000 1000 0 0 50 100 150 200 250 300 Time (seconds) (a) ScalableTCP with 200Mbit/sec BG 0 0 50 100 150 200 250 300 Time (seconds) (b) ScalableTCP with 600Mbit/sec BG 8000 7000 cwnd ssthresh 8000 7000 cwnd ssthresh cwnd and ssthresh (packets) 6000 5000 4000 3000 2000 cwnd and ssthresh (packets) 6000 5000 4000 3000 2000 1000 1000 0 0 50 100 150 200 250 300 Time (seconds) 0 0 50 100 150 200 250 300 Time (seconds) (c) H-TCP with 200Mbit/sec BG (d) H-TCP with 600Mbit/sec BG Figure 9.13: cwnd trace of New-TCP algorithms with various CBR Background Traffic Loads on DataTAG. gorithms on the DataTAG testbed. With 600Mbit/sec background, the cwnd dynamic of ScalableTCP is as expected which results in high utilisation of the path (with the exception of an early packet drop which forces the flow to undergo ScalableTCP congestion avoidance in order to fill the pipe). However, with 200Mbit/sec background, a different cwnd dynamic was observed whereby consecutive sequential recalculations of ssthresh causes cwnd to reach small values which takes much time before cwnd reaches its previous maximum. Similar dynamics were observed (but not shown) with HSTCP. As observed in Figure 9.13, the amount of time required for H-TCP to recover from these low values of cwnd is much faster than that of ScalableTCP - it is this responsiveness of H-TCP that allows it to achieve a greater goodput
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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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8.1. Methodology 147 fed into the d
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8.1. Methodology 149 Various other
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8.2. Test Calibration 151 Goodput (
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8.2. Test Calibration 153 cwnd and
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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 215 and 216: 9.2. Preferential Flow Handling Usi
Page 229 and 230: 9.3. Internet Transfers 229 can cau
Page 231 and 232: 9.3. Internet Transfers 231 Stanfor
Page 233 and 234: 9.3. Internet Transfers 233 10 1 St
Page 235 and 236: 9.3. Internet Transfers 235 1000 90
Page 237 and 238: 9.3. Internet Transfers 237 Fractio
Page 239 and 240: 9.3. Internet Transfers 239 10000 c
Page 241 and 242: 9.3. Internet Transfers 241 achieve
Page 243 and 244: 9.4. Summary 243 performance of sin
Page 245 and 246: 9.4. Summary 245 Nevertheless, a Di
Page 247 and 248: 10.1. Summary 247 PCs. But at 1Gb/s
Page 249 and 250: 10.2. New-TCP Suitability Study 249
Page 251 and 252: 10.2. New-TCP Suitability Study 251
Page 253 and 254: 10.3. Future Directions 253 low ove
Page 255 and 256: 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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