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7.9.5. Latency Overtime Test
Latency Overtime
shows the overall pattern of latency across time as the test is run, at different loads.
Latency Overtime results show for each receiving port, the minimum, average, and maximum latency of
frames received during the specified time interval throughout the test. Compared to the Latency test, the
Latency Overtime test can provide a finer view of latency behavior of the DUT's load tolerance limits.
Test method:
The time period is based on the value specified in the Time interval field. DApps-QoS reads the time the
sending port sent the frame (Transmit Time) and the time the receiving port recognizes the trigger frame
(Receive Time).
Latency is calculated as:
Latency = (Receive Time) - (Transmit Time)
You can set up multiple unicast flows for each port, some unidirectional and some bidirectional, each with a
different frame size, protocol and scheme for priority routing. The test uses the specified test duration, a
starting percentage load (based on the wire rate), or a step frame size by which to increase the load during
the test and a frame size at which the test ends. During the test, these values determine the duration for
which the DUT is tested at a specific load. The load generated by NuDOG series can be customized with
different packet lengths and for specified period of times.
Test Iterations
Continuous
Click to activate continuous testing with the same settings.
Duration (Secs)
The duration of time (in seconds) for the test. The range for the testing time is
1~5000
.
Number of Trials
The number of times of the test. The range for the number of times of the test is
1~100
.
Tx Rate
The rate of packet transfer. You can also set the load unit in percentage or
Mbps here.
Maximum
Receive
The maximum limit to receive packets in Mbps/sec.
