Re: [chrony-users] Chrony not taking SOCKET data from Application

Hi Miroslav,

With Chrony configured using GPS and PPS refclocks I observed from "chronyc tracking" output (filtering on "Ref time") that in each minute there is a second missing. Any idea on what could be the cause of this? Or is this chronyc issue.

Please provide your valuable feedback.

Attached the log file for reference.

Thanks & Regards

Sarveshwar.K

On Fri, Jun 30, 2023 at 10:33 AM sarveshwar k <sarveshwar.kt@xxxxxxxxx> wrote:

Thank you Emmanuel Bill and for the information on using makestep.

On Wed, Jun 28, 2023 at 10:58 PM Emmanuel Fusté <manu.fuste@xxxxxxxxx> wrote:
Le 28/06/2023 à 19:19, Bill Unruh a écrit :
> Why would you be using makestep if the difference were more than
> 100ns. That
> both seems extreme and totally subverts the action of chrony. Chrony is
> designed to correct the system clock to the best estimate of the true
> time and
> rate. Makestep ruins that, especially the rate estimate. Nothing can
> control
> the clock to 100ns unless you have very special hardware. 100ns is
> less than
> 100 ft of cable, and needs very special impedance matching to attain.

The main problem is not the cable, but the system himself : bus latency,
irq latency etc...
You're right : very special hardware is needed to reach less than 100ns
measurement induced error/system clock tracking.

Emmanuel.

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