Provided is a method of streaming transfer of data between a plurality of devices of a computer system. The method includes providing data to be sent from a source device to a target device and includes receiving, at the source device, one or more transfer credits from the target device. A transfer credit may be indicative of an amount of data that the target device is authorizing to be sent to the target device. The method also includes determining whether or not an accumulated transfer credit value satisfies a threshold value. If the accumulated transfer credit value satisfies the threshold value, the source device sends data to the target device and modifies the accumulated transfer credit value based on a quantity of data sent. If the accumulated transfer credit value does not satisfy the threshold value the source device does not send data to the target device.