Allow user to specify a static link capacity on mm-link's command line

[anirudhSK]

I have been using Mahimahi in a course and we frequently need students to rate limit links to a specific static link capacity (e.g., 1 Mbit/s). It seems unnecessary to create a trace file for this purpose. I am happy to work on this feature myself.

[akshayknarayan]

btw, @fcancialosi implemented this (--cbr): https://github.com/fcangialosi/mahimahi

[keithw]

Cool! There is also a clunkier approach available using the mm-rate-to-events script that comes with mahimahi. If you want to make a trace with a continuous 14.7 megabits per second, accurate to 0.01%:

yes 14.7 | ./mahimahi/scripts/mm-rate-to-events | head -n 10000

You can also do this at the command line with an ephemeral trace file:

mm-link <(yes 14.7 | mm-rate-to-events | head -n 10000) <(yes 2.2 | mm-rate-to-events | head -n 10000)

--cbr is definitely a more elegant UI...