Ixia Black Book: 802.11ac Wi-Fi Benchmarking

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Test Case: Latency Benchmark Test<strong>Fi</strong>gure 22.Latency Test ResultsPN 915-2634-01 Rev A December 2012 35
Test Case: Latency Benchmark Test<strong>Fi</strong>gure 23.Jitter Test Results7. Save the configuration file from the test before exiting the test or continuing with thenext benchmark test.Result AnalysisThe latency and jitter at different frame sizes are useful for indicating areas where theDUT takes extra time processing the frames when forwarding. Ideally, the latencywould be consistent across all frame sizes and have a low overall absolute value.High latency can lead to issues with responsiveness in real-time, interactive applicationssuch as changing TV channels with a set top box. It also can have a throttling effect onTCP which slows down all the applications that run over TCP.Troubleshooting and DiagnosticsThe following table lists the common access point performance problems and the tipsto troubleshoot these problems.IssueThe maximum latencyis hundreds ofmilliseconds or more,but the average andminimum latency arereasonable.Troubleshooting TipThis could happen due to one of the following:• The AP takes a long time delivering the first few framesbefore it has “learned” the location of the destination.After the first few frames, the ensuing traffic is placed ontothe “fast path” and the latency improves dramatically.• There is an intermittent or recurring interruption in the systemthat is affecting the delivery of frames. For example, in APswhere the firmware handles the frame delivery, it iscommon to have the firmware perform a managementfunction for a short period of time and stall all the framePN 915-2634-01 Rev A December 2012 36
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Ixia Black Book: 802.11ac Wi-Fi Benchmarking

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