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Speed match buffers

Speed match buffers. Jim Warner UC Santa Cruz February 2010. Solution searching for problem. Campus 10G connection in Nov 2009 PerfSONAR might be useful Q: What happens when a fast (10 Gb/s) source sends to a slow (Gb/s) client over a long delay path?

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Speed match buffers

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  1. Speed match buffers Jim Warner UC Santa Cruz February 2010

  2. Solution searching for problem • Campus 10G connection in Nov 2009 • PerfSONAR might be useful • Q: What happens when a fast (10 Gb/s) source sends to a slow (Gb/s) client over a long delay path? • CENIC’s transition from Cisco to Foundry hinted this might be interesting.

  3. How much buffer to expect ??

  4. Not in the data sheet

  5. 1.6 Mbyte output buffer

  6. 1.6 MB to Seattle

  7. Buffer dialed up to 6 MB

  8. Same for Seattle

  9. Is there hope? • Vendors will not provide bigger buffers. $$$ and power • Ethernet flow control might help • Change TCP to make it less bursty http://yuba.stanford.edu/~yganjali/research/publications/Infocom-2006.pdf

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