Abstract: Among other things, flow rates of traffic among endpoints in a network are controlled. Notifications are received about flowlets originating or received at the endpoints. Each of the flowlets includes one or more packets that are in a queue associated with a corresponding flowlet. In response to the received notifications, updated flow rates are computed for the flowlets. The updated flow rates are sent to devices for use in controlling flow rates for the flowlets in accordance with the computed updated flow rates.

Abstract: Among other things, flow rates of traffic among endpoints in a network are controlled. Notifications are received about flowlets originating or received at the endpoints. Each of the flowlets includes one or more packets that are in a queue associated with a corresponding flowlet. In response to the received notifications, updated flow rates are computed for the flowlets. The updated flow rates are sent to devices for use in controlling flow rates for the flowlets in accordance with the computed updated flow rates. Also, rates of flow at endpoints of a network are controlled. A device in the network sends notification of a start or end of a flowlet at an endpoint of the network. The notification is sent to an allocator to which other devices send notifications with respect to other flowlets. At the device, a communication rate is received from the allocator. The rate is one of a set of communication rates for flowlets starting and ending at endpoints of the network.