As the Internet owes its scalability and stability to TCP, congestion control also plays a key role in the performance, efficiency, and stability of datacenters, as evidenced by the efforts to standardize congestion management (CM) for 10+ Gbps networks. The next step up from datacenters is CM for clouds. New solutions are necessary for clouds because, while the recent CM schemes have been tested on L2 reliable networks, they are limited by design to relatively small single domain datacenters. TCP, on the other hand, while scalable and continously evolving, was not designed for