7 points | by Asmod4n 6 hours ago ago
6 comments
Systems are absolutely not ready. Leap seconds are a bad idea and negative leap seconds are worse. Just don't do it and let the drift cancel out.
Google's proposal is a smear. [1] Most time servers do not use smear. No idea what behavior it may introduce in places where sub-second time is important. Curious if all these bugs [2] were fixed specifically to deal with going backwards.
[1] - https://developers.google.com/time/smear
[2] - https://rivassec.com/leap-second-chaos-2012.html
NTP.
By any other standard, most manually set clocks are up to a full minute off all the time.
Yeah, but we're thinking of systems where nanoseconds matter.
MiFID 2 alone forces sub-μs precision. Million times less than the leap 1 second.
NTP minute away is good for displaying date on the workstation, not for many of the devices that are critical to the modern world.
dont most systems that rely on sharp timing simply manage it themselves.
Yesno.
Sure they have their own time servers fed from the GPS, but they need to be _accurate_ in relation to the world.
But timestamps used by companies forced to use very accurate timing must be synchronised to UTC.
Systems are absolutely not ready. Leap seconds are a bad idea and negative leap seconds are worse. Just don't do it and let the drift cancel out.
Google's proposal is a smear. [1] Most time servers do not use smear. No idea what behavior it may introduce in places where sub-second time is important. Curious if all these bugs [2] were fixed specifically to deal with going backwards.
[1] - https://developers.google.com/time/smear
[2] - https://rivassec.com/leap-second-chaos-2012.html
NTP.
By any other standard, most manually set clocks are up to a full minute off all the time.
Yeah, but we're thinking of systems where nanoseconds matter.
MiFID 2 alone forces sub-μs precision. Million times less than the leap 1 second.
NTP minute away is good for displaying date on the workstation, not for many of the devices that are critical to the modern world.
dont most systems that rely on sharp timing simply manage it themselves.
Yesno.
Sure they have their own time servers fed from the GPS, but they need to be _accurate_ in relation to the world.
But timestamps used by companies forced to use very accurate timing must be synchronised to UTC.