ATOMIC-ATM Gateway

(Forwarding Multi-Source IP Traffic)

Currently we are implementing an ATOMIC-ATM gateway using a Sun SPARC host with a single FORE System ATM SBA-200 interface and a single Myrinet host interface.

Performance of forwarding multi-host source IP traffic:

• Experiment environment:
  • Gateway: Sun SPARC 20/71
  • Sources: Sun SPARC 10/51 and 20/50 (Myrinet-connected to the gateway)
  • Destination: Sun SPARC 20/71 (ATM-connected to the gateway)
  • Software: Myricom Myrinet-2.0c and FORE System SBA200-3.0.1.
  • Performance measurement tool used: burst.tar.Z
• Configuration comparison:

  

  • In all three configurations, two UDP flows originate in a Sun SPARC 10/51 and Sun SPARC 20/50 separately, merge through a Myrinet switch, and terminate in a Sun SPARC 20/71.
  • In ATOMIC configuration, flows do not go through gateway
  • In Myri/ATM gateway configuration, flows go through Myri/ATM gateway
  • In Myri/Myri gateway configuration, flows go through Myri/Myri gateway which has two Myrinet interfaces
• Tabulated performance results

Observations:

• ATOMIC UDP throughput cannot be kept up over a single OC3-c ATM (theoretical peak payload bandwidth = 140 Mbps) connection.
• Myri/Myri gateway is slower than Myri/ATM gateway. This indicates that Myrinet interface/driver may suffer relatively higher overhead.

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Last modified Aug 18, 1995.