[e2e] current congestion control specs?

[Mark Boolootian]

With regards to congestion control mechanisms, can folks tell me what specs
current TCP stacks should be implementing?  I assume RFC 2001 is the
baseline set of mechanisms.  What else could/should a protocol stack
implement?  SACK?  Does RFC 2914 encapsulate current thinking regarding
congestion control requirements?  (I haven't yet read it).

thanks,
mb