Re: Clock drift and other open issues: Collecting information

On Fri, 2023-12-29 22:07:54 +0100, Jan-Benedict Glaw <[email protected]> wrote:
>   My result so far is that the 4000/90 as well as the /60 seem to
> properly keep time on their own (with a drift of some two to four
> seconds per day) and ntpd is capable of managing that. A bit on the
> odd side: It seems to not extend the poll interval beyond 128sec for
> useable peers, and I've (at max) only seen 256sec once for a claimed
> falseticker. OTOH, the amd64 Linux box will extend to the 1024sec
> interval soonish. (It seems the amd64 box stays *very* long with a
> specific pll freq, whereas the VAX systems keep adjusting it by minute
> details. I guess that's a related fact.)

One night later:

# ntpq -n -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 2.netbsd.pool.n .POOL.          16 p    -   64    0    0.000   +0.000   0.122
*78.47.168.188   17.253.14.125    2 u  525 1024  377   29.679   -0.042   0.379
-142.132.210.78  131.188.3.222    2 u  376 1024  377   27.807   +0.747   1.423
+82.165.57.232   129.69.1.170     2 u  438 1024  377   21.954   -2.096   3.417
-217.144.138.234 124.216.164.14   2 u  334 1024  377   20.691   -0.411  36.561
+75.119.140.230  36.224.68.195    2 u  748 1024  377   19.794   -0.207   0.572
# ntptime
ntp_gettime() returns code 0 (OK)
  time e93a607d.8aae18ac  Sat, Dec 30 2023 10:25:17.541, (.541719615),
  maximum error 261529 us, estimated error 560 us, TAI offset 0
ntp_adjtime() returns code 0 (OK)
  modes 0x0 (),
  offset -879.658 us, frequency 32.676 ppm, interval 1 s,
  maximum error 261529 us, estimated error 560 us,
  status 0x2001 (PLL,NANO),
  time constant 10, precision 0.001 us, tolerance 496 ppm,


This is the /60 while being idle. So let's start a loop with GCC.

MfG, JBG


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