"Splitting the ping" by Ben Cox.
A clever approximation of one-way latency between hosts in a given direction (instead of traditional RTT, roundtrip time).
Transmit (up) and receive (down) may each take different routes on the Internet, or otherwise differ in latency due to efficiencies or priorities. If you primarily upload or download with a given service, then knowing the latency of that action may be more insightful than RTT.
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