High Performance WAN
Testbed Experiences & Results
Outline
Who did it:
Collaborators and sponsors
What was done?
On February 27-28, over
a Terabyte of data was transferred in 3700 seconds by S. Ravot of Caltech
between the Level3 PoP in Sunnyvale, near SLAC, and CERN.
The data passed through the TeraGrid router at StarLight from memory to memory as
a single TCP/IP stream at an average rate of 2.38 Gbps (using large windows and
9KByte “jumbo” frames).
This beat the former record by a factor of approximately 2.5, and used the US-CERN link at 99% efficiency.
How was it done: Typical
testbed
Typical Components
Challenges
Windows and Streams
Even with big windows
(1MB) still need multiple streams with Standard TCP
New TCP Stacks
Stock vs FAST
TCP
MTU=1500B
Jumbo frames
TCP stacks with 1500B
MTU @1Gbps
Jumbo frames, new TCP
stacks at 1 Gbits/s
Other gotchas
Who needs it?
What’s next?
More Information
Impact on others