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Performance Measurements of LANs MANs and SuperJANET III

Performance Measurements of LANs MANs and SuperJANET III. This is PRELIMINARY Baseline data for Grid development Latency Throughput / Bandwidth Packet Jitter Performance of 2 Mbit Managed Bandwidth Link TCP/IP Stream performance. PC software 0.01 m s/byte. Sun software 0.036 m s/byte.

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Performance Measurements of LANs MANs and SuperJANET III

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  1. Performance Measurements ofLANs MANs and SuperJANET III This is PRELIMINARY • Baseline data for Grid development • Latency • Throughput / Bandwidth • Packet Jitter • Performance of 2 Mbit Managed Bandwidth Link • TCP/IP Stream performance July 2000PPNCG Meeting R. Hughes-Jones

  2. PC software 0.01 ms/byte Sun software 0.036 ms/byte Latency • Round trip times measured using Request-Response UDP frames • Latency as a function of frame size • Slope gives sum of individual data transfer rates end-to-end • Histograms of individual measurements • On LAN Latency histograms ~ 2 ms wide July 2000PPNCG Meeting R. Hughes-Jones

  3. Sigma ~12 ms Latency: Man-DL • ATM MAN • 7 routers ~0.8ms / router • Router+link 0.4 ms/byte • DL-Liv ~10 ms rtt - agreement July 2000PPNCG Meeting R. Hughes-Jones

  4. Latency: Man-IC • Sigma decreases with size 3.4 -> 1.7 ms • Packet loss falls 5 -> 1 % July 2000PPNCG Meeting R. Hughes-Jones

  5. Latency: Man-UCL • Slope 1.84 ms/byte • Sigma decreases with size 3.7 -> 1.7 ms • Packet loss falls 3 -> 1 % July 2000PPNCG Meeting R. Hughes-Jones

  6. DL slope 2.5 ms/byte cf min time slope 1.5 ms/byte Latency: Man-GLA • Sigma decreases with frame size 2.6 -> 2.3 ms • NO Packet loss July 2000PPNCG Meeting R. Hughes-Jones

  7. Latency: Man-RAL • Sigma 4.5 -> 6.7 ms • NO Packet loss July 2000PPNCG Meeting R. Hughes-Jones

  8. Latency: Man-RAL Managed BW • 5 routers ~0.8ms / router • Slope 6.5 ms/byte • A 2Mbit link uses 4 ms/byte • NO Packet loss • Sigma ~ 2.0 ms • Sigma 4.5 ->6.7 ms July 2000PPNCG Meeting R. Hughes-Jones

  9. Latency: Man-MC • Pink main campus router • Blue NNW – SuperJANET • Nice exponential - queuing July 2000PPNCG Meeting R. Hughes-Jones

  10. Zero stats OK done Send data frames at regular intervals ●●● ●●● Time to send Time to receive Get remote statistics Send statistics Bandwidth • Send a burst of UDP frames spaced at regular intervals • Vary the frame size and the frame transmit spacing • Record • The time to send and the time to receive the frames • The number received, the number lost, number out of order July 2000PPNCG Meeting R. Hughes-Jones

  11. Bandwidth: Man-DL • ATM MAN • 10 Mbit link into the ICFA PC • No frames lost when not queuing July 2000PPNCG Meeting R. Hughes-Jones

  12. Bandwidth: Man-IC • NNW – ATM WAN – London Man • 1-2% frame loss when not queuing for all frame sizes July 2000PPNCG Meeting R. Hughes-Jones

  13. Bandwidth: Man-UCL • NNW – ATM WAN – London Man • Suspect a 10 Mbit link at UCL • 1-2% frame loss when not queuing for all frame sizes • IC-UCL frame loss ~0.1% July 2000PPNCG Meeting R. Hughes-Jones

  14. Bandwidth: Man-GLA • NNW – ATM WAN – Glasgow • NO frame loss when not queuing • Similar behavior to Man-IC July 2000PPNCG Meeting R. Hughes-Jones

  15. Bandwidth: Man-RAL • PC Manc. – NNW – ATM WAN – LAN RAL Sun • Odd bursts of frame loss when not queuing • 24 Mbit link into RAL July 2000PPNCG Meeting R. Hughes-Jones

  16. Bandwidth: Man-RAL Managed BW • PC Manc. LAN – ATM PVC – RAL Sun • NO frame loss when not queuing • Suggests PVC iS CBR, given 1 cell every 75 July 2000PPNCG Meeting R. Hughes-Jones

  17. Packet Jitter • Same protocol as for the Throughput tests • Send frames at regular fixed time intervals • Measure the difference between consecutive frame arrivals using the Pentium cycle counter. July 2000PPNCG Meeting R. Hughes-Jones

  18. Packet Jitter: Man-MC PRELIMINARY !! • HEP – gw-metro • Major peaks 160 ms • Satellites  40 ms • ATM cell 2.74 ms ? • 1000 byte frames appear to arrive too quickly. July 2000PPNCG Meeting R. Hughes-Jones

  19. Packet Jitter: IC-UCL PRELIMINARY !! • 1000 ms frame spacing • Structure for 100 byte frames • Satellites at  40 ms • ATM cell 2.74 ms ? July 2000PPNCG Meeting R. Hughes-Jones

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