I agree with Peter regarding processing time and worst case latency : T6 - T3
But for Latency, I would say it's T7 -T1. I consider it as time to first byte.
In JMeter it's:
JMeter measures the latency from just before sending the request to just
after the first response has been received. Thus the time includes all the processing
needed to assemble the request as well as assembling the first part of the response,
which in general will be longer than one byte. Protocol analysers (such as Wireshark)
measure the time when bytes are actually sent/received over the interface. The JMeter
time should be closer to that which is experienced by a browser or other application
client.
Also look at:
- Latency Time in Load Testing
