Dates and Events:
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OSADL Articles:
2023-11-12 12:00
Open Source License Obligations Checklists even better now![]() Import the checklists to other tools, create context diffs and merged lists
2022-07-11 12:00
Call for participation in phase #4 of Open Source OPC UA open62541 support project![]() Letter of Intent fulfills wish list from recent survey
2022-01-13 12:00
Phase #3 of OSADL project on OPC UA PubSub over TSN successfully completed![]() Another important milestone on the way to interoperable Open Source real-time Ethernet has been reached
2021-02-09 12:00
Open Source OPC UA PubSub over TSN project phase #3 launched![]() Letter of Intent with call for participation is now available
2017-09-12 12:00
OSADL project to create Open Source license checklists![]() Facilitate Open Source software delivery |
OSADL QA Farm on Real-time of Mainline Linux
About - Hardware - CPUs - Benchmarks - Graphics - Benchmarks - Kernels - Boards/Distros - Latency monitoring - Latency plots - System data - Profiles - Compare - Awards
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
Real-time Ethernet (TSN) synchronization analysis (star topology)
Overview - Peer-to-peer - Star topology - Demonstrator (TSN) - Demonstrator (OPC UA PubSub over TSN)
One of the Linux real-time test systems (rack #9, slot #3 at shadow position) serves as PTP grandmaster while receiving global time information via NTP in the same way as all other systems. This PTP server is connected to an industrial Cisco switch (type IE 3000-4TC) that is capable of handling PTP packets in layer 2 and is configured to transparently forward them in an end-to-end mode. This switch is, in turn, connected to two real-time test systems (rack #b, slot #6 at primary and shadow position) that serve as PTP test clients and are equipped with continuous PTP jitter and system time jitter monitoring. They receive time information uniquely from the PTP link. Thus, the three peers, one PTP grandmaster and two PTP clients, share the same time information with the below depicted jitter and can send SO_TXTIME flagged packets such as implemented in an OPC UA PubSub scenario across the peers with a predictable arrival time at the destination peer. The three computer systems, one PTP grandmaster and the two PTP slaves, are equipped with an Intel I210 network controller.
PTP grandmaster: Jitter analysis from system time to network adapter by week
Last update 10 minutes ago
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- Please note that the recorded values of this and of all below plots represent the maximum of subsequent 5-min intervals. Thus, from the given numerical values below the plot the only meaningful value is the one in the column labeled "Max:".
PTP client #1: Jitter analysis from network to network adapter and from network adapter to system by week
Last update 11 minutes ago
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- Jitter analysis from network to network adapter
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- Jitter analysis from network adapter to system time
PTP client #2: Jitter analysis from network to network adapter and from network adapter to system by week
Last update 2520 minutes ago
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- Jitter analysis from network to network adapter
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- Jitter analysis from network adapter to system time