Eric S. Raymond
esr at thyrsus.com
Mon Mar 11 09:00:54 UTC 2019
Matthew Petach <mpetach at netflight.com>:
> On Sun, Mar 10, 2019 at 8:04 PM Stephen Satchell <list at satchell.net> wrote:
> > So far as I can tell with NTP, there was no issue with time sources
> > becoming false-tickers, including my local GPS appliance. FWIW.
> I believe the rollover is *next* month, in April. :)
> "This paper is intended to provide an understanding of the possible effects
> of the April 6, 2019 GPS Week Number Rollover on Coordinated Universal Time
> derived from GPS devices."
I'm a domain expert in this area - lead of NTPsec and GPSD.
Everything said in that memo is correct. I would add only that it is
more normal now than not for GPSes to have a hidden pivot date. "For
example, a particular GPS device may interpret the WN parameter
relative to a firmware creation date and would experience a similar
rollover event 1024 weeks after that firmware creation date." Yes,
It is therefore unlikely that your GPSes will become falsetickers on 6
April. That's the good news. The bad news is that they *will* go
poof some unpredictable number of weeks later.
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
My work is funded by the Internet Civil Engineering Institute: https://icei.org
Please visit their site and donate: the civilization you save might be your own.
More information about the NANOG