DataTAG experiments

1

netlab.caltech.edu/FAST

• Features
• sender-side modification - easy to deploy
• high utilization low queueing delay
• tunable fairness
• loss tolerant
• only requires standard MTU

FAST improves utilization
DataTAG experiments
2

netlab.caltech.edu/FAST
FAST TCP Window Update

• FAQ
• for long latency high capacity networks
• Linux implementation in 2.4 kernels
• compatible with TCP at low speed
• may help wireless networks

Congestion control can be divided into two
parts, TCP and AQM, which form a distributed
feedback system. The use of queueing delay as
the congestion measure allows FAST to use the
current drop-tail routers. The new window control
algorithm is shown above.
WAN in Lab UltraLight Testbeds
FAST Partners
CERN Cisco DataTAG Georgia
Tech Haystack Internet2 Level(3) NC-ITEC Pacifi
c Northwest GigaPop PSC SLAC StarLight TERAGRID