I have just transferred more than 1 TByte from memory to memory between Sunnyvale and CERN at 2.38 Gbps in less than one hour using a single TCP stream, TCP Reno and Jumbo frames.

[root@w02gva add]# ./iperf-1.6.5 -s -w 128M
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size:  256 MByte (WARNING: requested  128 MByte)
------------------------------------------------------------
[  6] local 192.91.239.213 port 5001 connected with 198.51.111.90 port 32857
[ ID] Interval       Transfer     Bandwidth
[  6]  0.0-3700.0 sec  1099850260480 bits  2.38 Gbits/sec


The monitoring of the transfer is available at 
(it started at 6:00 and finished at 7:00): 
<a href="http://v01gva.cern.datatag.org/cgi-bin/cricket/grapher.cgi?target=%2Finterfaces%2Fr04gva.cern%2Ftengigabitethernet2-1;ranges=d%3Aw;view=Octets">
http://v01gva.cern.datatag.org/cgi-bin/cricket/grapher.cgi?target=%2Finterfaces%2Fr04gva.cern%2Ftengigabitethernet2-1;ranges=d%3Aw;view=Octets</a>