Transcript I2-techs.ppt

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
http://yuba.stanford.edu/~yganjali/research/
publications/Infocom-2006.pdf