E-VLBI and End-to-End Performance Masaki HirabaruYasuhiro KoyamaTetsuro Kondo NICT KoganeiNICT Kashima

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Presentation transcript:

e-VLBI and End-to-End Performance Masaki HirabaruYasuhiro KoyamaTetsuro Kondo NICT KoganeiNICT Kashima VLBI (Very Long Baseline Interferometry) delay radio signal from a star correlator A/D clock A/D Internet clock ASTRONOMY GEODESY ~Gbps Fringe e-VLBI geographically distributed observation, interconnecting radio antennas over the world Large Bandwidth-Delay Product Network issue Gigabit / real-time VLBI multi-gigabit rate sampling Example: From Tokyo to Boston TCP on a fast long path with a bottleneck bottleneck overflow queue loss Tokyo sender rate control Boston receiver loss detection feedback It takes 150ms to know the loss (buffer overflow). It keeps overflowing during the period… 150ms is very long for the high-speed network. 150ms at 1Gbps generates ~19MByte on the wire. Los Angeles 50ms 100ms bw 1G bw 0.8G Analyzing Advanced TCP Dynamic Behavior in a Real Network (Example: From Tokyo to Indianapolis at 1G bps with HighSpeed TCP) The data was obtained during e-VLBI demonstration at Internet2 Member Meeting in October Receiver Linux TCP Sender Linux 2.4 GbE RTT 200ms (100ms one-way) GbE Only 800 Mbps available Replaying in a Laboratory -Evaluation of Advanced TCPs- TCP NewReno (Linux) HighSpeed TCP (Web100) Example of Advanced TCPs with different bottleneck queue sizes BIC TCP queue size 100 packetsFAST TCP queue size 100 packets BIC TCP queue size 1000 packets FAST TCP queue size 1000 packets RouterSwitchRouterSwitch 1Gbps 100Mbps 1Gbps a) b) Device Queuing Delay (µs) Capacity (Mbps) Estimated Queue Size (1500B) Switch A *50 Switch B *180 Switch C *169 Switch D Switch E Router F Router G * set to 100M for measurement Measuring Bottleneck Queue Sizes Switch/Router Queue Size Measurement Result Typical Bottleneck Cases ReceiverSender Capacity C packet train lost packet measured packet Queue Size = C x (Delay max – Delay min ) Kwangju Busan 2.5G Fukuoka Korea 2.5G SONET KOREN Taegu Daejon 10G 1G (10G) 1G Seoul XP Genkai XP Kitakyushu Kashima 1G (10G) Fukuoka Japan 250km 1,000km 2.5G JGN II 9,000km 4,000km Los Angeles Chicago Washington DC MIT Haystack 10G 2.4G APII/JGNI I Abilene Koganei 1G(10G) Indianapolis 100km bwctl server Experiment for High-Performance Scientific Data Transfer 10G Tokyo XP / JGN II I-NOC *Performance Measurement Point Directory perf server e-vlbi server JGNII 10G GEANT SWITCH 7,000km TransPAC Pittsburgh U of Tokyo A BWCTL account available for CMM including Korean researchers International collaboration to support science applications VLBI Antenna Locations in North-East Asia Shintotsukawa 3.8m Tomakomai 11m, FTTH (100M) 70km from Sapporo Mizusawa 10m 20m 118km from Sendai Tsukuba 32m, OC48/ATMx2 SuperSINET Kashima 34m, 1Gx2 JGN, OC48/ATM Galaxy Yamaguchi 32m 1G, 75M SINET Gifu 11m 3m, OC48/ATMx2 SuperSINET Usuda 64m, OC48/ATM Galaxy Nanshan (Urumqi) 25m 70km from Urumqi Koganei 34m, 1Gx2 JGN, OC48/ATM Galaxy Miyun (Beijing) 50m 50km from Beijing 2Mbps Sheshan (Shanghai) 25m 30km from Shanghai Observatory is on CSTNET at 100M Jeju 20m Tamna U Seoul 20m Yonsei U Ulsan 20m U Ulsan Daejon 14m Taeduk Ishigaki 20m Ogasawara 20m Chichijima 10m Iriki 20m Kagoshima 6m Aira 10m Legend connected not yet connected antenna under construction Summary and Future Work High-performance scientific data transfer faces on network issues we need to work out. Big science applications like e-VLBI and High-Energy Physics need cooperation with network researchers. Deployment of performance measurement Infrastructure is on-going on world-wide basis. Lessens are shared with CHEP and KAIST experiments over APII and TransPAC as well as CMM (Common Measurement Machines). ENP2611 Network Processor Emulator APII Workshop 2004October 28-29, 2004 Appendix - VLBI System Transitions K5 Data Acquisition Terminal 1st Generation 2nd Generation 1983~ Open-Reel Tape Hardware Correlator 1990~ Cassette Tape Hardware Correlator e-VLBI over ATM 3rd Generation 2002~ PC-based System Hard-disk Storage Software Correlator e-VLBI over Internet K3 Correlator (Center) K3 Recorder (Right) K4 Terminal K4 Correlator 64Mbps 256Mbps 1 ～ 2Gbps Nobeyama 45m OC48/ATM Galaxy