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opencomputeproject / Time-Appliance-Project

Develop an end-to-end hypothetical reference model, network architectures, precision time tools, performance objectives and the methods to distribute, operate, monitor time synchronization within data center and much more...
MIT License
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seperate utc offset files #75

Closed TuxCoder closed 1 year ago

TuxCoder commented 1 year ago

Folowup of a discussion at the ISCPS

I saw that the UTC offset is represented as a seperate file. But the adjtimex syscall allows you to get/set the offset already. https://www.man7.org/linux/man-pages/man2/adjtimex.2.html

so the question is, are this two parameters synced and only a second way to obtain / set the offset or are this two separate values?

Best Regard TuxCoder

ahmadexp commented 1 year ago

@jlemon, would you please comment on this.

jlemon commented 1 year ago

The parameters unfortunately aren't synced. Those calls are for the kernel clock, not for the PHC clock.

There doesn't seem to be any current API to set a PHC clock's TAI/UTC offset, perhaps because the assumption is that the PHC only returns one timebase (TAI)?