Traffic Prioritization

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- Michael to build a special priority queue
- Needs the #807 refactor to be done

• Tom will implement prioritization for different packet types to ensure a clogged router only drops user traffic instead of important network infrastructure messages

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Tom said it will be a per-session queues

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Jason said primary reason: Don't let slow downloaders clog queues

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Tom said: can happen in the logic thread. Will need to revise a bit. The receiving needs to take in account queuing, so it's not immediately tic'd, so that will need to be changed in the network thread.

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Tom says "Michael to build a special priority queue" is no longer necessary

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information from failure case in the link layer to the routing layer to properly respond to congestion

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best way forward is to implement CoDel
needs a new type of NACK
some discussion between HEAD vs TAIL drop
needs input on how to identify bottlenecks correctly
need to communicate between first node and last node (since it'll backup from last node to first, and we need to inform the first node asap) we can't inform destination

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PR is in #873 just being reviewed

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Tom needs some changes in #906 which Jeff is going to break into pieces

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873 is merged now