Date: Tue, 23 Jan 2018 10:48:29 +0000 From: Mike Pumford <michaelp@bsquare.com> To: freebsd-stable@freebsd.org Subject: Re: Clock occasionally jumps backwards on 11.1-RELEASE Message-ID: <0b170dae-b816-ea49-3516-40bfd1deaa2a@bsquare.com> In-Reply-To: <CAOtMX2iCkurg8HXn7KD9AbrPcDVSRN-jK4MR%2BgFMAd%2BOFEdpow@mail.gmail.com> References: <CAOtMX2iCkurg8HXn7KD9AbrPcDVSRN-jK4MR%2BgFMAd%2BOFEdpow@mail.gmail.com>
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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 -- Mike Pumford | Senior Software Engineer T: +44 (0) 1225 710635 BSQUARE - The business of IoT www.bsquare.com <http://www.bsquare.com/>;
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