Date: Thu, 11 Feb 2010 11:25:15 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: ntpd struggling to keep up - how to fix? Message-ID: <20100211192515.GB13854@icarus.home.lan> In-Reply-To: <20100211190652.6a66c618.torfinn.ingolfsen@broadpark.no> References: <20100211190652.6a66c618.torfinn.ingolfsen@broadpark.no>
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On Thu, Feb 11, 2010 at 07:06:52PM +0100, Torfinn Ingolfsen wrote: > Hi, > > One of my machines, the fileserver-with-zfs-to-be[1] has trouble > keeping correct time. Or rather, ntpd is struggling. > In /var/lkog/messages I see this: > Feb 7 12:05:54 kg-f2 ntpd[909]: ntpd 4.2.4p5-a (1) > Feb 7 12:11:16 kg-f2 ntpd[910]: time reset +1.020413 s > Feb 7 12:11:16 kg-f2 ntpd[910]: kernel time sync status change 2001 > Feb 7 12:26:26 kg-f2 ntpd[910]: time reset +2.277793 s > Feb 7 12:41:29 kg-f2 ntpd[910]: time reset +2.260229 s > Feb 7 12:57:02 kg-f2 ntpd[910]: time reset +2.332972 s > Feb 7 13:21:24 kg-f2 ntpd[910]: time reset +3.659869 s > Feb 7 13:37:01 kg-f2 ntpd[910]: time reset +2.343230 s > Feb 7 13:52:24 kg-f2 ntpd[910]: time reset +2.310659 s > Feb 7 14:07:29 kg-f2 ntpd[910]: time reset +2.265705 s > Feb 7 14:23:03 kg-f2 ntpd[910]: time reset +2.335868 s > Feb 7 14:39:06 kg-f2 ntpd[910]: time reset +2.411116 s > Feb 7 14:54:32 kg-f2 ntpd[910]: time reset +2.318222 s > Feb 7 15:09:55 kg-f2 ntpd[910]: time reset +2.308120 s > Feb 7 15:25:49 kg-f2 ntpd[910]: time reset +2.388391 s > Feb 7 15:40:54 kg-f2 ntpd[910]: time reset +2.265464 s > Feb 7 15:55:57 kg-f2 ntpd[910]: time reset +2.257952 s > Feb 7 16:11:45 kg-f2 ntpd[910]: time reset +2.373325 s > > and this goes on an on, forever. At any give time, no matter how long the machine has been up, ntpq ca report this: > root@kg-f2# ntpq -p > remote refid st t when poll reach delay offset jitter > ============================================================================== > kg-omni1.kg4.no 129.240.64.3 3 u 13 64 37 0.162 703.094 444.681 > > Note: all machines on my LAN use my firewall as the ntp server. > The ntp server runs FreeBSD, none of the other machines have any trouble keeping time. > My workstation for example: > tingo@kg-v2$ ntpq -p > remote refid st t when poll reach delay offset jitter > ============================================================================== > *kg-omni1.kg4.no 129.240.64.3 3 u 44 64 377 0.138 4.018 0.338 > (my workstatuion also runs FreeBSD 8.0-stable / amd64) > > The machine runs FreeBSD 8.0-stable / amd64: > root@kg-f2# uname -a > FreeBSD kg-f2.kg4.no 8.0-STABLE FreeBSD 8.0-STABLE #2: Sun Jan 31 18:39:17 CET 2010 root@kg-f2.kg4.no:/usr/obj/usr/src/sys/GENERIC amd64 > > So, how can I get the machine to keep time / get ntpd synchronised? > > References: > 1) hw info: http://sites.google.com/site/tingox/ga-ma74gm-s2h > 2) FreeBSD info: http://sites.google.com/site/tingox/ga-ma74gm-s2h_freebsd Your machine has a rapidly drifting clock, usually an indicator of a hardware problem (crystal gone bad is a common one -- seen this at work quite a few times), or possibly a bad time counter source chosen by the kernel. Can you please provide the output of: sysctl kern.timecounter Finally, was this OS installation used on different hardware in the past? Meaning: was the hard disk previously installed on another machine? Why I'm asking: /var/db/ntpd.drift could be from an old computer (the previous hardware), and the clock drift rate would be different than that of your newer[1] hardware. If that's the case, please stop ntpd, rm /var/db/ntpd.drift, and restart ntpd. Be aware it will take up to 72 hours for the clock drift to be calculated correctly. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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