David S. Miller wrote:

For the millionth time, you can't just delete the existing sysctls.
That is a user visisble interface.

Instead, you have to make them at least appear to select a
single congestion control algorithm as I stated in the
following posting:

http://marc.theaimsgroup.com/?l=linux-kernel&m=110909973530321&w=2
 

I am heading in a different direction with making the TCP congestion 
protocols
a real infrastructure.  After the initial version gets done, then I will 
go back
and add compatiablity interface hooks as required.