Using rsync 2.6.7 to push files from one machine to a second machine running 2.6.7 daemon.
Both machines have 100 M NIC, and are connected to same switch.
Using "mediaopt full-duplex" throughput is 30k/s
Using "media auto" (which auto negotiates to 100 F-D throughput is 20M/s
I'd suggest trying the --whole-file option and seeing what throughput you get.
Closing due to lack of response. If you have more information, feel free to add it and reopen the bug.