Clock occasionally jumps backwards on 11.1-RELEASE

[Mike Pumford]

On 22/01/2018 17:07, Alan Somers wrote:
> Since upgrading my jail server to 11.1-RELEASE, the clock occasionally
> jumps backwards by 5-35 minutes for no apparent reason.  Has anybody seen
> something like this?
> 
> Details
> =====
> 
> * Happens about once a day on my jail server, and has happened at least
> once on a separate bhyve server.
> 
> * The jumps almost always happen between 1 and 3 AM, but I've also seen
> them happen at 06:30 and 20:15.
> 
That's the window when the period scripts are run which if you have a 
default configuration and a lot of jails will put the system under a lot 
of stress.
> * I'm using the default ntp.conf file.
> 
Are you running ntpd inside the jail or on the jail host? On my jail 
systems (which are 10.3 and 11.1) I run ntpd out the jail host (outside 
all jails) and not inside the jails and the jails then get the accurate 
time as the underlying host has accurate time.

Mike

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