Issues with limit_req_zone.

[Vishnu Priya Matha]

In limit_req_zone with rate set to 100/s and burst=50, we have below
observation
.
Scenario1
==========
no. of request made by jmeter = 170
# of request expected to be failing = 20
# of request actually failed = 23

Question: why 3 more request are failing and is this much of failure
expected

Scenario2
==========
no. of request made by jmeter = 160
# of request expected to be failing = 10
# of request actually failed = 14

Question: why 4 more request are failing and is this much of failure
expected

Scenario3
==========
no. of request made by jmeter = 145
# of request expected to be failing = 0
# of request actually failed = 4

Question: why 4 more request are failing when all expected to pass and is
this much of failure expected

Why is there a variation on the numbers than actual numbers specified. ?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,274089,274089#msg-274089