In this paper, we evaluate the performance of flow control mechanisms for reliable multicast under several re- transmission approaches in terms of scalability. The mechanisms examined are a window-based flow control mechanism for ACK- based retransmission approaches and a rate-based flow control mechanism for NAK-based retransmission approaches. Our sim- ulation results show that the NAK-based flow control mechanism has better scalability and higher throughput than the ACK-based flow control mechanism, and the delay incurred by a NAK sup- pression mechanism does not affect the performance of multicast flow control.
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