1. technische universiteit eindhoven 1 Problem 16: Design-space Exploration Jeroen Voeten, Bart Theelen Eindhoven University of Technology Embedded Systems Institute J.P.M.Voeten@tue.nl Packet-switch case

2. technische universiteit eindhoven 2 I/O Bus Links Network Adaptors Bus Arbiter I/O Ports Packet switch

3. technische universiteit eindhoven 3 Specification A second-generation 4 x 4 switch Fixed-sized packets of 25 bytes long Link bandwidth 10 Mbps in both input and output direction (50.000 packets per second) Incoming traffic per link: idle periods alternated with bursts packets in a burst have the same destination packet destination is homogeneously distributed (1 … 4) traffic stream characterized with load and average burst-size parameters; average burst-size is 10 packets Packets entering a full queue are lost Bus-arbitration: round robin (one complete packet per turn & work-conserving)

4. technische universiteit eindhoven 4 Minimize Total buffer capacities (in packets) Bus capacity (in packets per second) Maximize load that can be dealt with Requirements Average packet delay at most 200 s Packet loss probability at most 0.01 Optimization Criteria and Requirements