[ntp:questions] problem with ntpd refclock and pps via parallel port

David Lord snews at lordynet.org
Thu Feb 4 15:59:35 UTC 2010

unruh wrote:
> On 2010-02-04, David Lord <snews at lordynet.org> wrote:
>> unruh wrote:
>>> On 2010-02-03, David Lord <snews at lordynet.org> wrote:
>>>> Hal Murray wrote:
> ...
>>> Three possibilities. 
>>> a) if you run linux/bsd, run chrony. It corrects for temp drifts much
>>> much faster. 
>> That's out at moment as chrony isn't sufficiently stable and
>> backwards compatible. From my tests, I'd say offsets are lower
> Which version of chrony? It has received extensive alteration in the
> past few months, and chrony 1.24 is just coming out. 

1.23, but my brief checks with 1.24pre indicated a further improvement.

>> than ntpd by at least a factor of 3. Problem is monitoring
>> with chronyc requiring same version on remote as chronyd on
> Yes, because of all the changes the chronyc and chronyd must be the same
> version. 

That's a bit too much of a complication for me. I'd need to
setup build systems for older versions of NetBSD I'm
phasing out but might still be in use for a while.

>> server. I've also had complete lockups when attempting to peer
>> chrony with ntpd.
> That is much more serious. Note that I have been running 10 chrony
> machines from one ntp server for the past 2 years and have never seen a
> lockup. Can you give more information, at least to
> chrony-dev at chrony.tuxfamily.org

When I'm getting mails from new list I'll resend my my
original report but I've moved desktops and notebooks back
to ntpd. I've found using ntpd -q and having iburst on one
or more sources, I can get to within a few ms within 5-10
minutes of startup. On NetBSD chrony can't do any better at
startup as RTC features aren't available so far as I can



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