No I tested it on ordinary x64 kernel (4.9 , 3.16 etc..) coming from debian
& fc repos with no custom options.

I just installed pps-linux and invoked 'ldattach 18 /dev/ttyS0' (which also
loads pps_ldisc module) , maybe i'm missing something ?

2017-08-30 18:51 GMT+02:00 Miroslav Lichvar <mlich...@redhat.com>:

> On Tue, Aug 29, 2017 at 04:58:14PM +0200, Thibaut BEYLER wrote:
> > > #* PPS0                              0   4   377    11
> +4829ns[+6161ns]
> > >> +/- 3021ns
>
> > > PPS0                               23  17   383     +0.001        0.052
> > >>          +5ns    5548ns
>
> > I am using pps_ldisc, i tried pps-gpio but it was not better.
> >
> > I am using a custom serial cable (pin 1 of the serial cable is linked to
> > the bnc ouput on the gps timeserver), same setup had given good results
> > using an other software.
>
> The chronyc output suggests the PPS input is very jittery. What
> architecture is that? If it has GPIO I'd assume it's not just an
> ordinary x86_64 computer. Also, what kernel version is it running? Is
> the NOHZ config option enabled? Disabling it with nohz=off might help.
>
> --
> Miroslav Lichvar
>
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