2020-10-30 - 17:08
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OSADL QA Farm on Real-time of Mainline Linux

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Real-time Ethernet (Powerlink) packet interval and jitter analysis

Wakeup latency of all systems - Real-time optimization - Peer-to-peer UDP duplex link - OPC UA PubSub over TSN - Powerlink - Ethercat - Network load - kvm - Sleep states

One of the Linux real-time test systems (rack #b, slot #5) runs a Powerlink master kernel module that is connected to a B&R X20BC0083 Powerlink I/O node and is continuously sending cyclic system data at an interval of 500 µs. The packet stream is monitored using a B&R X20ET8819 Powerlink network analyzer (a figure of the setup is available in the related section of the QA Farm "About" page). The plots below are generated from 5-minute minimum, mean and maximum values of the packet interval as determined by the network analyzer. Considering a cycle time of 500 µs, the interval data and the jitter of the below 30-h plots are each based on a total of 216,000,000 individual timed cycles. In addition, the maxima per week, per month and per year can be displayed separately, and irregular events, if any, are stored in a data base. Manufacturers may use such long-term data for certification and similar purposes.

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Real-time Ethernet (Powerlink) jitter analysis
Please note that the recorded values represent minimum, mean and maximum values of 5-min intervals. Thus, the data in the columns labeled "Min:", "Avg:" and "Max:" are only relevant for the variables min, mean and max, respectively.


Real-time Ethernet (Powerlink) jitter analysis
Please note that the recorded value represents maxima of 5-min intervals. Thus, the data in the columns labeled "Min:" and "Avg:" should not be considered; the only relevant result is the maximum of consecutive 5-min maxima at the rightmost column labeled "Max:".