Design Space for a Bulk Transport Tool

2 Design Space Dimensions 2 2.1 Explicit congestion feedback . . . . . . 2 2.1.1 Source Quench . . . . . . . . . 3 2.1.2 Explicit Congestion Notification 3 2.1.3 eXplicit Congestion Protocol . 3 2.1.4 MaxNet . . . . . . . . . . . . . 4 2.1.5 Explicit Queuing Delay Accounting . . . . . . . . . . . . . 4 2.1.6 Discussion . . . . . . . . . . . . 4 2.2 Implicit input for congestion control algorithm . . . . . . . . . . . . . . . . 5 2.2.1 Loss-based congestion control . 5 2.2.2 Delay-based congestion control 6 2.2.3 Congestion control based on combined distributions . . . . . 6 2.2.4 Discussion . . . . . . . . . . . . 7 2.3 Kernel-space vs user-space implementation . . . . . . . . . . . . . . . . . . 7 2.3.1 Kernel-space implementation . 7 2.3.2 User-space implementation . . 7 2.3.3 Discussion . . . . . . . . . . . . 7 2.4 Protocol features and framing . . . . . 8 2.4.1 In-band vs out-of-band signaling 8 2.4.2 Timestamps . . . . . . . . . . . 8 2.4.3 Security nonces . . . . . . . . . 9 2.4.4 Path MTU discovery . . . . . . 9 2.4.5 Explicit Congestion Notification 9 2.4.6 Selective Acknowledgments . . 9 2.4.7 Request Compression . . . . . 9 2.5 Window-based vs rate-based protocols 10 2.6 TCP-compatible vs TCP-friendly . . . 10 2.7 State mostly kept at the sender vs the receiver . . . . . . . . . . . . . . . . . 10 2.8 Single vs multiple streams . . . . . . . 11 2.9 User and application programmer interfaces . . . . . . . . . . . . . . . . . 11