Virtual Cut-through Switching a transmission on the next channel starts directly when the new header flit is received a Channel is released after tail flit 0 HBBB 2 BIBb 0 10 Cycle
15 ❑ Transmission on the next channel starts directly when the new header flit is received ❑ Channel is released after tail flit Virtual Cut-through Switching
Virtual Cut-through Switching a transmission on the next channel starts directly when the new header flit is received a Channel is released after tail flit 0 HBBB 2 BIBb 0 10 Cycle
16 ❑ Transmission on the next channel starts directly when the new header flit is received ❑ Channel is released after tail flit Virtual Cut-through Switching
Virtual Cut-through Switching a transmission on the next channel starts directly when the new header flit is received a Channel is released after tail flit 0 BB 2 0 10 Cycle
17 ❑ Transmission on the next channel starts directly when the new header flit is received ❑ Channel is released after tail flit Virtual Cut-through Switching
Virtual Cut-through Switching Example Lower per-hop latency a Larger buffering required
❑ Lower per-hop latency ❑ Larger buffering required 0 5 Virtual Cut-through Switching Example 20
Wormhole Switching Intermediate nodes Destination node ource node Large packets are divided into small flits a An entire packet need not be buffered to move on to the next node increas i throughput o More efficient use of buffers than virtual cut-through o Bandwidth and channel allocation gre couple
21 Source node Intermediate nodes Destination node ❑ Large packets are divided into small flits ❑ An entire packet need not be buffered to move on to the next node, increasing throughput. ❑ More efficient use of buffers than virtual cut-through ❑ Bandwidth and Channel allocation are decoupled Wormhole Switching