Re: [chrony-users] Using cellular network clock as refclock in chrony

[Amol Lad <Amol.Lad@xxxxxxx>]

Thanks,

"Setting 'poll 1 filter 1' reduces the source selection time to 20 seconds from 40 seconds.

Is there a way to dynamically adjust these parameters? For example, at startup, the settings can be 'poll 1 filter 1' and my application sends samples every second. After the source is selected, my application can slow down to send samples once every 5 seconds, and the 'filter' can return to its default value and 'poll' can be set to 3."

Alternatively, can I always use "poll 1 filter 1" irrespective of my application sending samples every seconds or once every 5 seconds?

What are the drawbacks of setting 'poll 1 filter 1'?

Thanks again

Amol

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From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Sent: Wednesday, July 31, 2024 2:22 PM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx <chrony-users@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [chrony-users] Using cellular network clock as refclock in chrony

 

On Wed, Jul 31, 2024 at 08:42:52AM +0000, Amol Lad wrote:
> refclock SOCK /var/run/chrony.cellular.sock precision 1 prefer poll 3 refid MODM
>
> (I tried reducing the poll to 1 but this does not seem to make any difference)

Try adding "filter 1" to reduce the number of samples required per
poll. Unlike with SHM, chronyd doesn't know how many SOCK samples
there will be per poll, so it doesn't adjust the filter length
automatically.

--
Miroslav Lichvar


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