Stephen Hemminger [off-list ref] writes:

Since developers want to experiment with different congestion
control mechanisms, and the kernel is getting bloated with overlapping
data structure and code for multiple algorithms; here is a patch to
split out the Reno, Vegas, Westwood, BIC congestion control stuff
into an infrastructure similar to the I/O schedulers.

[...]

Did you do any benchmarks to check that wont slow it down? 

I would recommend to try it on a IA64 machine if possible. In the
past we found that adding indirect function calls on IA64 to networking
caused measurable slowdowns in macrobenchmarks.
In that case it was LSM callbacks, but your code looks like it will
add even more.

One way to avoid this concern would be to set up the "standard"
congestion avoidance in a way that it could be inlined.  

-Andi