Set maximum speed for scp

From the man page: -l limit Limits the used bandwidth, specified in Kbit/s.

I'm not convinced the -l setting works properly with big values: On my RHEL6 system if see:

-l not specified

• Expected: Whatever the wan can handle
• Actual: 20 Megabytes per second

-l 8000

• Expected: 1 Megabyte per second
• Actual: 1 Megabyte per second

-l 80000

• Expected: 10 Megabytes per second
• Actual: 150 Kilobytes per second