2024-12-23 - 16:45

Dates and Events:

OSADL Articles:

2024-10-02 12:00

Linux is now an RTOS!

PREEMPT_RT is mainline - What's next?


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


2023-03-01 12:00

Embedded Linux distributions

Results of the online "wish list"


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



OSADL Projects

OSADL QA Farm on Real-time of Mainline Linux

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Real-time Ethernet (TSN) synchronization analysis (peer-to-peer)

Peer-to-peer topology with a PTP grandmaster and a PTP slave directly connected to each other
Peer-to-peer topology with a PTP grandmaster and a PTP slave directly connected to each other

Overview - Peer-to-peer - Star topology - Demonstrator (TSN) - Heterogeneous peer-to-peer - Demonstrator (OPC UA PubSub over TSN)

The purpose of this featured network link is to showcase and test the performance of a heterogenous (Intel Pentium N4200 and Texas Instruments SK-AM62) TSN connection. One of the Linux real-time test systems (rack #e, slot #6 at primary 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 via a peer-to-peer link to another real-time test system (rack #e, slot #6 at shadow position) that is configured as PTP slave. As can be derived from the below depicted jitter plots over time, SO_TXTIME flagged packets such as implemented in an OPC UA PubSub scenario can be sent across the peers with a predictable arrival time at the destination peer. The PTP grandmaster is equipped with an Intel I210-T1 network adapter, and the PTP slave uses the CPSW SoC network adapter.

PTP grandmaster: Jitter analysis from system time to network adapter by week

Last update 18 minutes ago

Jitter analysis of time synchronization to the network adapter
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 18 minutes ago

Jitter analysis of the network adapter
Jitter analysis from network to network adapter

Jitter analysis of the system
Jitter analysis from network adapter to system time