An Investigation into Transport Protocols and Data Transport ...

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10.2. New-TCP Suitability Study 252 Internet Dedicated (sole) Dedicated (shared) Tier-0 to Tier-1 FAST H-TCP Tier-1 to Tier-2 Tier-2 to Tier-3/4 H-TCP FAST BicTCP FAST H-TCP FAST H-TCP Table 10.1: Overview of Recommended New-TCP algorithms for different Tiers based upon the type of end-to-end connection. H-TCP will have distinct advantages, whilst with large buffer provisioning, the RTT fairness of H-TCP becomes better. 10.2.5 Summary Table 10.1 summarises the recommended New-TCP algorithm for use in each application area. Generally, FAST and H-TCP are the recommended New- TCP algorithms for use for the majority of the LHC MONARC design. However, it should be noted that FAST is only recommended where sufficient network buffering is available. Across multi-domain network paths such as that of the Internet, such tuning may not be possible; especially when there are a large number of FAST TCP flows. This also applies to dedicated network paths - depending upon who supplies the dedicated circuit this tuning may not be possible. BicTCP, whilst maintaining very unfriendly and relatively long (and hence undesirable) convergence times, does provide high throughput with relatively
10.3. Future Directions 253 low overhead rates and is therefore recommended for dedicated circuits when there is no other traffic. FAST and H-TCP are recommended for use on dedicated circuits for regardless of whether it is a shared circuit or solely dedicated. Their advantage lies in the ability to maintain high throughput, yet being fair and facilitating fast convergence times between competing flows. 10.3 Future Directions It is expected that many new TCP congestion control algorithms will come to light both from the natural evolution of the existing New-TCP algorithms and from future designs and ideas. A natural question arises from this: would future networks impose a homogenous or heterogeneous mix of these algorithms? Whilst it is not within the scope of this dissertation to answer this question, it is worth noting that the work in Chapter 7 sets a foundation from which comparative testing has been identified as important in being able to understand and evolve congestion control algorithms. It should therefore be important to be able to expand upon these ideas in to a consistent framework from which disparate research groups can effectively contribute to a common shared goal. More importantly it will enable the focus of effort in order to evolve the more promising algorithms. The expansion of this work is summarised in the following sections. 10.3.1 New-TCP Algorithms The research conducted in this dissertation suggests that the algorithmic implementation of H-TCP has certain advantages; in particular the polyno-
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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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8.2. Test Calibration 155 100 1 Agg
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8.2. Test Calibration 157 1000 FAST
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8.3. Results 159 10 100 Total Throu
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8.3. Results 161 14 12 HSTCP 1 α H
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8.3. Results 163 cwnd (packets) 120
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8.3. Results 165 Fraction Bytes Ret
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8.3. Results 167 1200 1000 HTCP 1 H
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8.3. Results 169 This is due to the
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8.3. Results 171 4000 3500 3000 HTC
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8.3. Results 173 800 700 600 Standa
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8.3. Results 175 1 1 Fairness Ratio
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8.3. Results 177 10 100 Total Throu
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8.3. Results 179 1000 Standard TCP
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8.3. Results 181 600 500 Standard T
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8.4. Discussion of Results 183 Asym
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8.4. Discussion of Results 185 New-
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8.4. Discussion of Results 187 Asym
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8.5. Summary 189 The importance of
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9.1. Transfer Tests Across Dedicate
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Page 247 and 248: 10.1. Summary 247 PCs. But at 1Gb/s
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Page 289 and 290: B.2. Wide Area Network Tests 289 Da
Page 291 and 292: C.3. DataTAG 291 Cisco 7606 Cisco 7
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Page 295 and 296: 295 ham02gva.datatag.org:192.91.239
Page 297 and 298: Bibliography 297 [All03] [AMA + 99]
Page 299 and 300: Bibliography 299 [BPSK96] H. Balakr
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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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