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XTRAMUS TECHNOLOGIES
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7.9.4. Latency Test
Latency
test measures the time it takes for the DUT to forward a packet. The latency test calculates the
minimum, maximum, and average latency at different loads. This can provide valuable information about the
conditions under which the DUT is suitable for voice and video transmissions.
The Latency test helps you determine:
How a DUT delivers traffic across multiple destination ports.
How the latency varies.
Latency per port.
A device's latency characteristics.
The effect on latency when you modify the DUT's RAM and re-run test.
Test method:
This test tracks the latency of each test frame on a frame-by-frame basis. DApps-QoS reads the time the
sending port sent the frame (Transmit Time) and the time the receiving port recognizes the trigger frame
(Receive Timestamp).
Latency is calculated as:
Latency = (Receive Time) - (Transmit Time)
You can set up multiple unicast flows for each port, some unidirectional and some bi-directional, each with a
different frame size, protocol and scheme for priority routing.
The load generated by the 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.
