Low latency TCP work from ISLN taken from rstone's branch and updated against HEAD. Probably does not work as is, but need to get the ball rolling on discussing the design and validation.
convert tcp timestamps to using a scaled sbintime based off of the TSC
See the following paper for background:
Safe and Effective Fine-grained TCP Retransmissions for Datacenter Communication
NB: this a first iteration and still needs to be extended to support unsynchronized TSCs and refactor the MD bits more appropriately