Common Challenges

• Input buffering (run out of buffer space on receiver)

  • backpressure: network “fills up”, doesn’t accept another transaction, source must still receive even when it can’t send
  • ACK / NACK
  • Drop the transaction

• Fetch Deadlock

  • request / response
  • network full can’t send, so receive
  • it’s a request, can’t send response since network is full!
  • Solution 1: provide two networks (request, response)
  • Solution 2: credit based
  • Solution 3: ACK/NACK

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