Queuing using partial packet buffers

• Frames are segmented into linked lists of partial packet buffers (PPBs) by the IDMA.

• Pointers to the head of each list are placed in queues by the IQM.

• Each queue is associated with an output port and priority level.

• The PPB payload size corresponds to the payload size of the EXACT data block (DB) message.

• Segmentation benefits:

  • Prevents blocking the switch fabric during the transfer of long frames.
  • Efficient queue memory usage.

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