ATOMIC-ATM Gateway

(Forwarding Single-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 single-host source IP traffic:

• Experiment environment:
  • Gateway: Sun SPARC 20/71
  • Source: Sun SPARC 20/71
  • Destination: Sun SPARC 20/71
  • Software: Myricom Myrinet-2.0c and FORE System SBA200-3.0.1.
  • Performance measurement tool used: blast.tar.gz
• Configuration comparison:
  • In ATOMIC configuration, the flow traverses only Myrinet link(s)
  • In ATM configuration, the flow traverses only ATM link(s)
  • In Gateway configuration, the flow goes through Myrinet/ATM gateway
• Tabulated performance values

Observation:

• Why does the gateway show asymmetric performance?
  • On the gateway, Myrinet device driver introduces higher overhead in sending packets than in receiving packets.
  • With 640-Mbps Myrinet link bandwidth, the packet sending rate of a Myrinet host is higher than that of a FORE System OC3-c ATM host.
• 150-Mbps ATOMIC UDP throughput cannot be kept up over a single OC3-c ATM (theoretical peak payload bandwidth = 140 Mbps) connection.

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Last modified Aug 18, 1995.