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Re:Open-sourcing a more precise time appliance by cedricgle on Wednesday August 11, 2021 @03:26PM (#28146531)
If you want the go under the nanosecond there is the White Rabbit [1][2] project. The CERN uses it to control the magnets in the loop of a particule accelator. It is also based on NTP, Ethernet and FPGA.

[1]: http://www.ohwr.org/projects/white-rabbit

[2]: https://en.wikipedia.org/wiki/White_Rabbit_Project

Re:Open-sourcing a more precise time appliance by profquail on Thursday August 12, 2021 @10:44PM (#28164776)
This was standardized as the L1 Sync feature of IEEE1588:2019, as described here: https://blog.meinbergglobal.com/2020/09/17/whats-new-in-ieee...