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Y. Kodama, T. Kudoh, O. Tatebe , S. Sekiguchi Grid Technology Research Center

This study focuses on achieving stable network flow in high bandwidth-delay product networks by implementing smooth traffic shaping techniques on the GNET-1 hardware network testbed. Results show improved performance and reduced packet loss in transpacific networks. The approach involves adapting smooth traffic shaping to stabilize traffic in such networks.

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Y. Kodama, T. Kudoh, O. Tatebe , S. Sekiguchi Grid Technology Research Center

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  1. Realization of a stable network flow with high performance communication in high bandwidth-delay product network Y. Kodama, T. Kudoh, O. Tatebe, S. Sekiguchi Grid Technology Research Center National Institute of Advanced Industrial Science and Technology (AIST)

  2. Outline • Background • What is a problem in a high bandwidth-delay product network • Smooth traffic shaping • Hardware network testbed GNET-1 • Experiments • Results of a network emulated by GNET-1 • Results of a transpacific network in BWC03 • Conclusion CHEP 2004

  3. Peak 1Gbps RTT RTT RTT > 2.4 Gbps Background • Why traffic on a high bandwidth-delay product network is not stable ? But sometimes packets are lost ! 500Mbps Stream A 500Mbps Stream B 1.5Gbps < 2.4Gbps 500Mbps Stream C 2.4Gbps network TCP has software pacing by self clocking of ACK packet, but it is not always effective. CHEP 2004

  4. Smooth traffic shaping • Limit the bandwidth of each stream to 1/n of bottleneck line rigidly by adjusting IFG (Inter Frame Gap) • Adjusting IFG is very smoothly limit the stream bandwidth, we realize it on hardware network testbed GNET-1 1Gbps Average 500Mbps 500Mbps 0Mbps IFG = Frame Len. Frame CHEP 2004

  5. Peak 1Gbps RTT RTT RTT Adapting smooth traffic shaping • Traffic on a high bandwidth-delay product networkbecome stable. GNET-1 500Mbps Stream A < 2.4Gbps GNET-1 500Mbps Stream B 1.5Gbps GNET-1 500Mbps Stream C Network CHEP 2004

  6. The Look of GNET-1 GNET-1 GNET-1 Control SNMP Agent Width:19inch, Height:1U(1.7inch) GBIC: 4 ports USB CHEP 2004

  7. Block Diagram of GNET-1 via GBIC I/F CHEP 2004

  8. ＧＮＥＴ－１ ＧＮＥＴ－１ ＧＮＥＴ－１ ＧＮＥＴ－１ ＧＮＥＴ－１ Usage of GNET-1 • Emulation • a delay, bit error rate, output bandwidth, buffer control, etc. • Measurement • Precise network statistics • input/output bandwidth in every 100 microsecond. • Synchronize the local clock using GPS. • New Protocol prototype • Proposing protocol in feasibility study. Internet CHEP 2004

  9. Outline • Background • What is a problem in a high bandwidth-delay product network • Smooth traffic shaping • Hardware network testbed GNET-1 • Experiments • Results of a network emulated by GNET-1 • Results of a transpacific network in BWC03 • Conclusion CHEP 2004

  10. Network emulated by GNET-1 PC3 PC4 PC1 PC2 • PC1: iperf –c PC3 –w 8M • PC2: iperf –c PC4 –w 8M • increase sockbuff limit • Standard TCP/IP with WADIFQ option by Web100 GNET-1 • Smooth traffic shaping • 250Mbps for each stream • Finegrain measurement • 2ms interval for bandwidth SW GNET-1 SW Emulate bottleneck network • Bottleneck one way delay (100ms) • Bottleneck Bandwidth (500 Mbps) • Bottleneck Buffer size (512KB) CHEP 2004

  11. Effects of traffic shaping No traffic shaping: traffic shaping: 250Mbps each bottleneck: one-way delay 100ms, 500Mbps, Buffer size 512KBytes CHEP 2004

  12. Transpacific network in BWC03 Bandwidth Challenge in SC'03 Computer Fabrics in CHEP 04 Trans-Pacific Gfarm Datafarm testbed 147 nodes 16 TBytes 4 GB/s SuperSINET Indiana Univ Titech Trans-Pacific thoretical peak 3.9 Gbps Gfarm disk capacity 70 TBytes disk read/write 13 GB/sec SuperSINET NII 2.4G 10 nodes 1 TBytes 0.3 GB/s Abilene Univ Tsukuba 32 nodes 23 TBytes 2 GB/s NY 2.4G(1G) KEK 7 nodes 4 TBytes 0.2 GB/s OC-12 ATM 500M Chicago Tsukuba WAN APAN Tokyo XP Maffin 16 nodes 12 TBytes 1 GB/s SC2003 Phoenix AIST LA 2.4G 16 nodes 12 TBytes 1 GB/s APAN/TransPAC SDSC CHEP 2004

  13. SW PC 1G GNET-1 PC 1G 1G PC 1G SW PC 1G GNET-1 1G PC 1G SW PC 1G GNET-1 1G PC 1G Environment SuperSINET NewYork 1G 285ms SW 1G / shaping APAN/TransPAC Chicago 500M 250ms 1G / shaping 10G • 11 PC on both ends, LA line was divided to 3 link • HighSpeedTCP/IP with WADIFQ, MTU size : 6000 APAN/TransPAC LosAngeles 2.4G 141ms 1G / shaping CHEP 2004

  14. Smooth traffic shaping (results of BWC03) 950 Mbps in NY (+20) 500 Mbps in Chicago 800 Mbps in LA3 750 Mbps in LA2 780 Mbps in LA1 (-20) 930 Mbps in NY 500 Mbps in Chicago 800 Mbps in LA3 750 Mbps in LA2 800 Mbps in LA1 • Achieved stable 3.78Gbps Disk to Disk data transfer on 3.9 Gbps,144ms long-fat network. • Currently the shaping bandwidth is defined by user, we will make automatic tuning facility. CHEP 2004

  15. Conclusion and Future Plan • Smooth traffic shaping of GNET-1 realizes stable network traffic on a high bandwidth-delay product network. • Automatic tuning of the bandwidth of each stream is a next challenge. • Please refer to http://www.gtrc.aist.go.jp/gnet/ about details of GNET-1. • We are also developing a software pacing method in network driver. • We are now developing a new tool for 10GbE. CHEP 2004

  16. Photograph of GNET-10 19 inch rack mountable 2U height FPGA:XC2VP75 x 2 Memory: 1GByte x 2 10GbE: LR 2 ports GbE: GBIC 2ports CHEP 2004

  17. Sockbuf and WADIFQ effects on a stream Measurement every 1ms Bottleneck line: 100ms, 1Gbps, 16MB no packet loss on a network WADIFQ: full of IFQ counted as no congestion, same effect as setting IFQ large Required sockbuf size : 100ms * 2 * 1Gbps = 25MB CHEP 2004

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