NTS and ipv6

Paul Theodoropoulos paul at anastrophe.com
Thu Jul 25 20:11:30 UTC 2019

On 7/25/19 13:06, Gary E. Miller wrote:
> Yo Paul!
> On Thu, 25 Jul 2019 12:46:45 -0700
> Paul Theodoropoulos<paul at anastrophe.com>  wrote:
>> refclock shm unit 1 refid PPS minpoll 1 maxpoll 4 flag4 1 prefer
>> refclock shm unit 0 refid GPS minpoll 1 maxpoll 4 flag4 1 noselect
> I used to that, but it has bad effects on startup.
> ntpd tends to add servers and refclocks in the order found in the
> ntp.conf.  SHM1 is prolly your best source, so good to have at the
> top.
> SHM0 is probably your worst source, but it will be the second one added.
> It will likely differ a lot from SHM1, thus prevent them both from
> being used until more servers are added so the clusters can be
> determined.
> Put the SHM0 last, and your ntpd will converge faaster on startup.
> So best to rank your sources, in order from best to worst in the file.
> If you care about startup speed.  Others say never restart...
Right - when this was first mentioned - putting shm0 at the end of the 
file - it did make a big difference in startup, both speed and quality. 
But then I went with 'noselect', and it seemed to have the same effect - 
so, just for OCD symmetry in ntp.conf, I put it back next to shm1. :)

Paul Theodoropoulos

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