| Re: [chrony-dev] SW/HW timestamping on Linux |
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On Wed, Nov 16, 2016 at 11:24:14PM -0800, Denny Page wrote:
> To be clear, would I still expect to see ‘D H’ in the measurements log with this change?
Yes, but the second bit in the column with four test bits should be
always zero.
> Thanks,
> Denny
>
>
> > On Nov 16, 2016, at 00:53, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
> >
> > Hm, the fix helped with the spikes I was seeking. Did we rule out the
> > possibility that in your case the spikes are due to the other issue with
> > out-of-order HW timestamps? Could you try it with this patch to make
> > sure only measurements with HW timestamps are used?
> >
> > --- a/ntp_core.c
> > +++ b/ntp_core.c
> > @@ -1434,6 +1434,9 @@ receive_packet(NCR_Instance inst, NTP_Local_Address *local_addr,
> > prevent a synchronisation loop */
> > testD = message->stratum <= 1 || REF_GetMode() != REF_ModeNormal ||
> > pkt_refid != UTI_IPToRefid(&local_addr->ip_addr);
> > +
> > + if (inst->local_tx.source != NTP_TS_HARDWARE || rx_ts->source != NTP_TS_HARDWARE)
> > + testB = 0;
> > } else {
> > offset = delay = dispersion = 0.0;
> > sample_time = rx_ts->ts;
> >
>
--
Miroslav Lichvar
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