On Mon, Dec 13, 2021 at 6:56 AM Poul-Henning Kamp <[email protected]> wrote: > > In FreeBSD you get all that for free: > > https://papers.freebsd.org/2002/phk-timecounters.files/timecounter.pdf >
"It is painfully obvious that the interrupt latency is the dominant noise factor in PPS timestamping in the second case." This is exactly what I found when I did this 15 years after your paper. Though what I think is more interesting, is that despite using 15 years newer hardware, the resulting PPS precision ends up being nearly the same for both timestamping methods. Your final graphs are very similar the one I have tried (succeeded?) at posting, other than you using a time series I used a histogram. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
