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? CENIC’s transition from Cisco to Foundry hinted this might be interesting.

How much buffer to expect ??

Not in the data sheet

1.6 Mbyte output buffer

1.6 MB to Seattle

Buffer dialed up to 6 MB

Same for Seattle

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