[ntp:questions] PPS not working on newer kernel/distros

Brandon Applegate brandon at burn.net
Tue Oct 9 17:04:05 UTC 2018


> On Oct 9, 2018, at 5:43 AM, Joachim Fabini <Joachim.Fabini at tuwien.ac.at> wrote:
> 
> Hello Brandon,
> 
> Which version of ntp is deployed on your system?
> Any relevant/suspect output in syslog when restarting ntpd?
> What does ntpq report?
> 
> First guess: please remember http://bugs.ntp.org/show_bug.cgi?id=3367 -
> this was staged (only) for ntp-4.2.8p11. Make sure that either your ntp
> has the patch already or patch your sources manually.
> 
> br Joachim
> 

Hey Joachim,

Actually I think you helped me out a few years ago when I first found this issue.  You gave me a patch which I put against 4.2.8p6 I believe at the time.  I was getting the kcbind error on Ubuntu 14.04.  

So yes, now that I’ve installed 4.2.8p12 (that includes the patch) - I no longer get this error.  The bad news though is that it seems like I never lock on to PPS.  I never get an ‘o’ in my billboard.  If I put fudge flag3 back to 0, I seem to be in business (I get ‘o’ quickly and my offset settles down to near 0).  But (and I don’t have actual before/after graphs or hard data to confirm this) but it seems like it wavers a bit more now than it did previously on Ubuntu 14.04 with fudge flag  3 set to 1.

Nevertheless - I’d still like to understand a bit more about fudge flag 3 on this.  It was working in Ubuntu 14.04, and doesn’t seem to work on Debian 9 (what I settled on now) or Ubuntu 18.04.

I’m not quite sure I understand what the real difference in this flag is ?  Is one mode more accurate than the other ?  Why did it work just fine in an older distro and no longer does ?

Also - thanks for your reply and help on this so far - it’s much appreciated.

--
Brandon Applegate - CCIE 10273
PGP Key fingerprint:
0641 D285 A36F 533A 73E5  2541 4920 533C C616 703A
"For thousands of years men dreamed of pacts with demons.
Only now are such things possible."



More information about the questions mailing list