So I added the offset and am now getting this. Does this mean I’m successfully synced to the PPS since the NTP is selectable (by the ‘-‘) but is instead syncing to the PPS?
So it appears that chrony can only sync to one thing and not both (a ref clock and a server). Does it syncing to my PPS mean that its getting the time/date from the ntp, but the seconds from the PPS?
Also, I did notice that occasionally it appears I am losing synchronization to the server/refclock by the following image:
Is this because I have the polling be too fast? Do you know what could be causing this?
Thank you for all your help. I sincerely appreciate it.
-----Original Message-----
From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Sent: Monday, November 2, 2020 7:36 AM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] PPS Synchronization Verification
On Mon, Nov 02, 2020 at 12:24:32PM +0000, Chang, Benjamin wrote:
> The PPS signal is coming from the NTP server (it's a syncserver S650) and is connected via a 232 line. I essentially did this
https://www.crc.id.au/2016/09/24/adding-a-pps-source-to-ntpd/ but switched the ntpd kernel with the chrony kernel. Should
I set an offset of .00002 for the PPS?
Yes, that should make two sources agree with each other. Or, you can add the opposite correction to the NTP source. Without a trusted time source it's difficult to tell which one is more accurate. If you enabled hardware timestamping,
I'd probably trust more the NTP source.
--
Miroslav Lichvar
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