| Re: [chrony-users] setserial low_latency - is it necessary? |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] setserial low_latency - is it necessary?
- From: Sviatoslav Feshchenko <sviatoslav.feshchenko@xxxxxxxxx>
- Date: Mon, 17 Jun 2024 11:47:47 +0000
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Many thanks for clarifying!
Sviatoslav
On Monday, June 17th, 2024 at 3:02 AM, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
> On Thu, Jun 13, 2024 at 08:22:03PM +0000, Sviatoslav Feshchenko wrote:
>
> > - Is the 1PPS signal buffered if "low_latency" is NOT set?
>
>
> I don't think it is. It should trigger the interrupt immediately.
>
> > - Is it necessary to configure the serial port for "low_latency" if 1PPS signal is available on the DCD pin, when the goal is to maximize the accuracy of the 1PPS signal?
>
>
> For PPS it shouldn't matter. Easy to verify. Plot the raw offset from
> the refclocks log, switch the low_latency flag, and see if there are
> any jumps or changes in stability.
>
> --
> Miroslav Lichvar
>
>
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