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9b5f11cd3d
Use an MPSC ring buffer to hold data for each datagram handler. Holding this data in a per-handler buffer avoids the HoL blocking we experienced when we had per-listener buffers with data from all threads mixed up in them. This also gets rid of the mt_list contention we were suffering before, that was causing some threads to be stuck for a significant amount of time, causing warnings and even crashes in some cases.