Sorry, didn&#x27;t mean atomic.<p>Was intending to say that calls are never considered to be instantaneous from either user or sys point of view, they <i>always</i> have duration.<p>Latency on the other hand is almost always about scheduling, whether OS-level scheduling or hardware (ISR) scheduling.<p>Another case; network latency is the time between a packet being sent and it being received.... <i>not</i> the time taken to process that packet.
That is a direct analogy to what we&#x27;re talking about here.