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Challenge 4: Small Packets
With multimedia streaming flows becoming common, an increasingly large fraction of the bytes transmitted belong to control traffic
Compounding the congestion control, small packets may excessively contribute to lower network efficiency in terms of full-size packet transfer performance

For small packets, the Nagle algorithm allows to avoid congestion collapse and pathological congestion [RFC896]
dramatically reduce the number of small packets
aggregation implies delay for packets => applications that are jitter-sensitive typically disable the Nagle algorithm
PPT Version