Runaway clock? - NTP

This is a discussion on Runaway clock? - NTP ; I set up a NTP server, but every hour a "time reset" of about 7 seconds sets the clock back. I read somewhere that setting kernel´s HZ to 100 (instead of 1000 default) would solve this. But the problem persists. ...

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  1. Runaway clock?

    I set up a NTP server, but every hour a "time reset" of about 7 seconds sets
    the clock back. I read somewhere that setting kernel´s HZ to 100 (instead of
    1000 default) would solve this. But the problem persists. As I am running a
    FreeBSD 6 server, I was told that "tickadj" wouldn´t be the answer... What
    else could I do? Here goes the ntpd´s log:

    ....
    14 Mar 16:33:27 ntpd[26074]: peer 146.164.48.5 event 'event_reach' (0x84)
    status 'unreach, conf, 2 events, event_reach' (0xa024)
    14 Mar 16:36:40 ntpd[26074]: system event 'event_peer/strat_chg' (0x04)
    status 'sync_alarm, sync_local_proto, 4 events, event_clock_reset' (0xc545)
    14 Mar 16:36:40 ntpd[26074]: synchronized to LOCAL(0), stratum=12
    14 Mar 16:36:40 ntpd[26074]: system event 'event_sync_chg' (0x03) status
    'leap_none, sync_local_proto, 5 events, event_peer/strat_chg' (0x554)
    14 Mar 16:36:40 ntpd[26074]: system event 'event_peer/strat_chg' (0x04)
    status 'leap_none, sync_local_proto, 6 events, event_sync_chg' (0x563)
    14 Mar 16:41:57 ntpd[26074]: synchronized to 82.165.184.7, stratum=3
    14 Mar 16:41:57 ntpd[26074]: synchronized to 200.20.186.75, stratum=1
    --> 14 Mar 16:52:32 ntpd[26074]: time reset -6.959701 s
    14 Mar 16:52:32 ntpd[26074]: kernel time sync enabled 2001
    14 Mar 16:52:32 ntpd[26074]: system event 'event_clock_reset' (0x05) status
    'leap_none, sync_unspec, 11 events, event_peer/strat_chg' (0xb4)
    14 Mar 16:52:32 ntpd[26074]: system event 'event_peer/strat_chg' (0x04)
    status 'leap_none, sync_unspec, 12 events, event_clock_reset' (0xc5)
    14 Mar 16:52:32 ntpd[26074]: peer 68.226.79.67 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:53:35 ntpd[26074]: peer 200.192.112.8 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:53:35 ntpd[26074]: peer 82.165.184.7 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:53:36 ntpd[26074]: peer LOCAL(0) event 'event_reach' (0x84) status
    'unreach, conf, 3 events, event_reach' (0x8034)
    14 Mar 16:53:36 ntpd[26074]: peer 200.144.121.33 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:53:37 ntpd[26074]: peer 146.164.48.5 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:53:37 ntpd[26074]: peer 200.20.186.75 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:53:38 ntpd[26074]: peer 200.80.18.132 event 'event_reach' (0x84)
    status 'unreach, conf, 3 events, event_reach' (0xa034)
    14 Mar 16:56:52 ntpd[26074]: synchronized to LOCAL(0), stratum=12
    14 Mar 17:24:42 ntpd[26074]: synchronized to 68.226.79.67, stratum=2
    14 Mar 17:27:55 ntpd[26074]: synchronized to 146.164.48.5, stratum=1
    14 Mar 17:28:59 ntpd[26074]: offset 0.000000 sec freq -500.000 ppm error
    0.002128 poll 6
    14 Mar 17:45:00 ntpd[26074]: synchronized to 200.20.186.75, stratum=1
    14 Mar 17:46:04 ntpd[26074]: synchronized to 146.164.48.5, stratum=1
    --> 14 Mar 17:45:58 ntpd[26074]: time reset -6.499221 s
    14 Mar 17:45:58 ntpd[26074]: system event 'event_clock_reset' (0x05) status
    'leap_none, sync_unspec, 15 events, event_peer/strat_chg' (0xf4)
    14 Mar 17:45:58 ntpd[26074]: system event 'event_peer/strat_chg' (0x04)
    status 'leap_none, sync_unspec, 15 events, event_clock_reset' (0xf5)
    14 Mar 17:47:01 ntpd[26074]: peer 200.144.121.33 event 'event_reach' (0x84)
    status 'unreach, conf, 4 events, event_reach' (0xa044)
    ....

    Thanks in Advance.

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  2. Re: Runaway clock?

    nVidia MotherBoard?
    using APIC?
    Spread Spectrum enabled?

    uwe

  3. Re: Runaway clock?

    Intel Motherboard.
    Yes, using APIC. Where do I disable it, BIOS or loader.conf? Will it affect
    a SMP kernel?
    Spread Spectrum: where do I check if it is enabled?

    Thanks.


    From: Uwe Klein
    To: questions@lists.ntp.isc.org
    Subject: Re: Runaway clock?
    Date: Fri, 16 Mar 2007 11:07:28 +0100

    nVidia MotherBoard?
    using APIC?
    Spread Spectrum enabled?

    uwe

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