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Speed match buffers Jim Warner UC Santa Cruz February 2010.

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Presentation on theme: "Speed match buffers Jim Warner UC Santa Cruz February 2010."— Presentation transcript:

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

4 How much buffer to expect ??

5 Not in the data sheet

6 1.6 Mbyte output buffer

7 1.6 MB to Seattle

8 Buffer dialed up to 6 MB

9 Same for Seattle

10 Is there hope? Vendors will not provide bigger buffers. $$$ and power Ethernet flow control might help Change TCP to make it less bursty publications/Infocom-2006.pdf


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