On Sun, 3 Sep 2006, Jason George wrote:
> > How large is the "real" offset? What happens if you set the time
> > yourself to a value reasonable close to the actual value?
>
> About 3.5 hrs... The reason I found the bouncing numbers suspect was that I
> have a dual-boot XP/OpenBSD laptop for field work. The time reported from the
> system clock in XP vs. OpenBSD is always 7 hrs off, but ntpd converges cleanly
> on the actual time on that old Dell Latitude.
That probably because XP assumes the system clock is using the local
time zone, while OpenBSD uses GMT. I think there's even a faq entry
for that.
>
>
> I manually changed the clock so that it was ~30 minutes off actual.
> The time appears to be converging a little more predictably now.
So that's looks ok.
Now there's a maximum number the time can be adjusted using
adjtime(2), so you're probably hitting that with the larger offset. If
you have the time and patience, you might wanna try to see what
happens after a long time.... does the time actually converge to the
right time or not? If it converges, then there's no real problem,
apart from some ugly log output. It looks like the large ofsets are
getting smaller, so thats a hint thing will turn out ok in the end.
adjtime(2), and by consequence ntpd(8), were never designed to adjust
really large offsets. It is on my list to take some more drastic
measures for those cases.
-Otto
>
> Sep 3 01:06:06 dl360-800 ntpd[25752]: ntp engine ready
> Sep 3 01:06:07 dl360-800 savecore: no core dump
> Sep 3 01:06:29 dl360-800 ntpd[25752]: peer 62.149.14.222 now valid
> Sep 3 01:07:24 dl360-800 ntpd[20261]: adjusting local clock by 1738.268778s
> Sep 3 01:11:53 dl360-800 ntpd[20261]: adjusting local clock by 1727.952257s
> Sep 3 01:15:13 dl360-800 ntpd[20261]: adjusting local clock by 1720.300831s
> Sep 3 01:19:41 dl360-800 ntpd[20261]: adjusting local clock by 1709.898174s
> Sep 3 01:24:15 dl360-800 ntpd[20261]: adjusting local clock by 1699.403299s
> Sep 3 01:25:22 dl360-800 ntpd[20261]: adjusting local clock by 1696.860246s
> Sep 3 01:29:26 dl360-800 ntpd[20261]: adjusting local clock by 1687.461275s
>
>
> Up until that move-the-clock-closer change, the numbers reported by ntpd were
> appeared in what looks to be a couple of discrete ranges...sometimes even
> increasing for the entries clearly not in the correct range (~12000 to 13000s)
> at that time.
>
> Sep 2 15:01:34 dl360-800 ntpd[11652]: adjusting local clock by 7798.724879s
> Sep 2 15:05:20 dl360-800 ntpd[11652]: adjusting local clock by 13446.206131s
> Sep 2 15:06:24 dl360-800 ntpd[11652]: adjusting local clock by 2145.038121s
> Sep 2 15:07:31 dl360-800 ntpd[11652]: adjusting local clock by 7791.831799s
> Sep 2 15:11:49 dl360-800 ntpd[11652]: adjusting local clock by 13431.275244s
> Sep 2 15:13:22 dl360-800 ntpd[11652]: adjusting local clock by 7785.823806s
> Sep 2 15:15:31 dl360-800 ntpd[11652]: adjusting local clock by 13422.782728s
> Sep 2 15:19:56 dl360-800 ntpd[11652]: adjusting local clock by 13412.590067s
> Sep 2 15:21:32 dl360-800 ntpd[11652]: adjusting local clock by 13408.929958s
> Sep 2 15:25:16 dl360-800 ntpd[11652]: adjusting local clock by 13400.332153s
> Sep 2 15:28:31 dl360-800 ntpd[11652]: adjusting local clock by 13392.807482s
> Sep 2 15:30:06 dl360-800 ntpd[11652]: adjusting local clock by 13389.173186s
> Sep 2 15:32:49 dl360-800 ntpd[11652]: adjusting local clock by 7762.083958s
> Sep 2 15:37:05 dl360-800 ntpd[11652]: adjusting local clock by 13373.105074s
> Sep 2 15:38:10 dl360-800 ntpd[11652]: adjusting local clock by 2144.954800s
> Sep 2 15:39:47 dl360-800 ntpd[11652]: adjusting local clock by 7754.032285s
> Sep 2 15:41:38 dl360-800 ntpd[12524]: peer 83.170.1.225 now invalid
> Sep 2 15:41:38 dl360-800 ntpd[12524]: peer 66.90.78.182 now invalid
> Sep 2 15:41:38 dl360-800 ntpd[12524]: peer 24.130.207.189 now invalid
> Sep 2 15:41:58 dl360-800 ntpd[11652]: adjusting local clock by 13361.852470s
> Sep 2 15:45:40 dl360-800 ntpd[11652]: adjusting local clock by 13353.318526s
> Sep 2 15:49:27 dl360-800 ntpd[11652]: adjusting local clock by 2138.751600s
> Sep 2 15:51:53 dl360-800 ntpd[12524]: peer 84.16.227.200 now valid
> Sep 2 15:52:09 dl360-800 ntpd[11652]: adjusting local clock by 13338.376743s
> Sep 2 15:52:38 dl360-800 ntpd[12524]: peer 81.5.136.18 now valid
> Sep 2 15:55:57 dl360-800 ntpd[11652]: adjusting local clock by 13329.650124s
> Sep 2 15:59:42 dl360-800 ntpd[11652]: adjusting local clock by 13320.971186s
> Sep 2 16:01:19 dl360-800 ntpd[12524]: peer 62.206.253.10 now invalid
> Sep 2 16:02:55 dl360-800 ntpd[12524]: peer 84.16.227.200 now invalid
> Sep 2 16:03:30 dl360-800 ntpd[11652]: adjusting local clock by 13312.285860s
> Sep 2 16:07:45 dl360-800 ntpd[11652]: adjusting local clock by 13302.471098s
> Sep 2 16:11:00 dl360-800 ntpd[11652]: adjusting local clock by 13295.005341s
> Sep 2 16:13:44 dl360-800 ntpd[11652]: adjusting local clock by 2141.180582s
> Sep 2 16:14:48 dl360-800 ntpd[11652]: adjusting local clock by 2138.724389s
> Sep 2 16:18:38 dl360-800 ntpd[11652]: adjusting local clock by 13277.439112s
> Sep 2 16:20:51 dl360-800 ntpd[11652]: adjusting local clock by 13272.318780s
> Sep 2 16:21:26 dl360-800 ntpd[11652]: adjusting local clock by 2146.147600s
> Sep 2 16:24:44 dl360-800 ntpd[11652]: adjusting local clock by 13263.369168s
> Sep 2 16:26:55 dl360-800 ntpd[11652]: adjusting local clock by 2142.442300s
> Sep 2 16:28:32 dl360-800 ntpd[11652]: adjusting local clock by 13254.628506s
> Sep 2 16:29:05 dl360-800 ntpd[11652]: adjusting local clock by 2146.227600s
> Sep 2 16:32:24 dl360-800 ntpd[11652]: adjusting local clock by 13245.731779s
> Sep 2 16:34:35 dl360-800 ntpd[11652]: adjusting local clock by 13240.699778s
> Sep 2 16:34:50 dl360-800 ntpd[12524]: peer 83.170.1.225 now valid
> Sep 2 16:35:02 dl360-800 ntpd[12524]: peer 24.130.207.189 now valid
> Sep 2 16:36:00 dl360-800 ntpd[12524]: peer 66.90.78.182 now valid
> Sep 2 16:37:19 dl360-800 ntpd[11652]: adjusting local clock by 13234.387662s
> Sep 2 16:41:41 dl360-800 ntpd[11652]: adjusting local clock by 13224.326819s
> Sep 2 16:43:13 dl360-800 ntpd[11652]: adjusting local clock by 7682.398192s
> Sep 2 16:46:58 dl360-800 ntpd[11652]: adjusting local clock by 13212.159952s
> Sep 2 16:48:33 dl360-800 ntpd[11652]: adjusting local clock by 13208.498850s
> Sep 2 16:51:50 dl360-800 ntpd[11652]: adjusting local clock by 13200.944922s
> Sep 2 16:55:18 dl360-800 ntpd[12524]: peer 84.16.227.200 now valid
> Sep 2 16:55:56 dl360-800 ntpd[12524]: peer 62.206.253.10 now valid
> Sep 2 16:56:08 dl360-800 ntpd[11652]: adjusting local clock by 13191.061634s
> Sep 2 17:00:30 dl360-800 ntpd[11652]: adjusting local clock by 13180.982426s
> Sep 2 17:03:48 dl360-800 ntpd[11652]: adjusting local clock by 13173.394425s
> Sep 2 17:07:36 dl360-800 ntpd[11652]: adjusting local clock by 13164.637403s
> Sep 2 17:08:43 dl360-800 ntpd[11652]: adjusting local clock by 2144.937083s
> Sep 2 17:12:31 dl360-800 ntpd[11652]: adjusting local clock by 13153.318269s
> Sep 2 17:14:05 dl360-800 ntpd[11652]: adjusting local clock by 7646.806323s
> Sep 2 17:15:40 dl360-800 ntpd[11652]: adjusting local clock by 7646.794921s
> Sep 2 17:16:11 dl360-800 ntpd[11652]: adjusting local clock by 4895.934554s
> Sep 2 17:20:36 dl360-800 ntpd[11652]: adjusting local clock by 13134.695894s
> Sep 2 17:24:22 dl360-800 ntpd[11652]: adjusting local clock by 13126.049736s
> Sep 2 17:25:08 dl360-800 ntpd[12524]: peer 66.90.78.182 now invalid
> Sep 2 17:25:08 dl360-800 ntpd[12524]: peer 24.130.207.189 now invalid
> Sep 2 17:28:04 dl360-800 ntpd[11652]: adjusting local clock by 13117.498051s
> Sep 2 17:29:42 dl360-800 ntpd[11652]: adjusting local clock by 7628.735737s
> Sep 2 17:33:35 dl360-800 ntpd[11652]: adjusting local clock by 13104.814199s
> Sep 2 17:37:55 dl360-800 ntpd[11652]: adjusting local clock by 13094.837907s
> Sep 2 17:39:30 dl360-800 ntpd[11652]: adjusting local clock by 2143.829237s
> Sep 2 17:42:11 dl360-800 ntpd[11652]: adjusting local clock by 13084.990458s
> Sep 2 17:45:56 dl360-800 ntpd[11652]: adjusting local clock by 13076.379573s
> Sep 2 17:47:59 dl360-800 ntpd[12524]: peer 84.16.227.200 now invalid
> Sep 2 17:50:14 dl360-800 ntpd[11652]: adjusting local clock by 13066.436572s
> Sep 2 17:51:19 dl360-800 ntpd[11652]: adjusting local clock by 2144.995673s
> Sep 2 17:53:30 dl360-800 ntpd[11652]: adjusting local clock by 13058.927869s
> Sep 2 17:56:38 dl360-800 ntpd[11652]: adjusting local clock by 13051.740031s
> Sep 2 17:58:51 dl360-800 ntpd[11652]: adjusting local clock by 2142.378290s
> Sep 2 18:02:01 dl360-800 ntpd[11652]: adjusting local clock by 13039.320806s
> Sep 2 18:05:16 dl360-800 ntpd[11652]: adjusting local clock by 13031.822795s
> Sep 2 18:06:21 dl360-800 ntpd[11652]: adjusting local clock by 2145.004986s
> Sep 2 18:07:25 dl360-800 ntpd[11652]: adjusting local clock by 2142.550981s
> Sep 2 18:08:48 dl360-800 ntpd[12524]: peer 81.5.136.18 now invalid
> Sep 2 18:11:15 dl360-800 ntpd[11652]: adjusting local clock by 13018.040462s
> Sep 2 18:14:00 dl360-800 ntpd[11652]: adjusting local clock by 13011.707898s
> Sep 2 18:15:57 dl360-800 ntpd[12524]: peer 66.90.78.182 now valid
> Sep 2 18:16:04 dl360-800 ntpd[11652]: adjusting local clock by 13006.988015s
> Sep 2 18:19:55 dl360-800 ntpd[11652]: adjusting local clock by 12998.077881s
> Sep 2 18:20:25 dl360-800 ntpd[12524]: peer 24.130.207.189 now valid
> Sep 2 18:23:04 dl360-800 ntpd[11652]: adjusting local clock by 12990.836930s
> Sep 2 18:26:46 dl360-800 ntpd[11652]: adjusting local clock by 12982.296397s
> Sep 2 18:28:55 dl360-800 ntpd[11652]: adjusting local clock by 12977.368303s
> Sep 2 18:30:01 dl360-800 ntpd[11652]: adjusting local clock by 7559.909737s
> Sep 2 18:34:09 dl360-800 ntpd[11652]: adjusting local clock by 12965.314347s
> Sep 2 18:37:23 dl360-800 ntpd[11652]: adjusting local clock by 12957.862817s
> Sep 2 18:37:53 dl360-800 ntpd[11652]: adjusting local clock by 2146.324616s
> Sep 2 18:40:03 dl360-800 ntpd[11652]: adjusting local clock by 7546.517841s
> Sep 2 18:40:45 dl360-800 ntpd[12524]: peer 84.16.227.200 now valid
> Sep 2 18:41:17 dl360-800 ntpd[12524]: peer 84.16.227.200 now invalid
> Sep 2 18:44:24 dl360-800 ntpd[11652]: adjusting local clock by 12941.722338s
> Sep 2 18:47:04 dl360-800 ntpd[11652]: adjusting local clock by 12935.559393s
> Sep 2 18:51:18 dl360-800 ntpd[11652]: adjusting local clock by 12925.827219s
> Sep 2 18:55:28 dl360-800 ntpd[11652]: adjusting local clock by 12916.206607s
> Sep 2 18:58:09 dl360-800 ntpd[11652]: adjusting local clock by 12910.044464s
> Sep 2 19:01:51 dl360-800 ntpd[11652]: adjusting local clock by 12901.512216s
> Sep 2 19:02:02 dl360-800 ntpd[12524]: peer 81.5.136.18 now valid
> Sep 2 19:03:25 dl360-800 ntpd[11652]: adjusting local clock by 2143.892570s
> Sep 2 19:06:01 dl360-800 ntpd[11652]: adjusting local clock by 12891.923017s
> Sep 2 19:09:21 dl360-800 ntpd[11652]: adjusting local clock by 12884.239973s
> Sep 2 19:12:02 dl360-800 ntpd[11652]: adjusting local clock by 12878.074196s
> Sep 2 19:15:44 dl360-800 ntpd[11652]: adjusting local clock by 12869.546839s
> Sep 2 19:15:54 dl360-800 ntpd[12524]: peer 83.170.1.225 now invalid
> Sep 2 19:16:17 dl360-800 ntpd[11652]: adjusting local clock by 2146.236713s
> Sep 2 19:20:10 dl360-800 ntpd[11652]: adjusting local clock by 12859.359884s
> Sep 2 19:24:30 dl360-800 ntpd[11652]: adjusting local clock by 12849.371610s
> Sep 2 19:27:45 dl360-800 ntpd[11652]: adjusting local clock by 12841.886494s
> Sep 2 19:31:32 dl360-800 ntpd[11652]: adjusting local clock by 12833.152139s
> Sep 2 19:32:03 dl360-800 ntpd[11652]: adjusting local clock by 2146.327966s
> Sep 2 19:35:14 dl360-800 ntpd[11652]: adjusting local clock by 12824.644142s
> Sep 2 19:36:10 dl360-800 ntpd[12524]: peer 84.16.227.200 now valid
> Sep 2 19:39:05 dl360-800 ntpd[11652]: adjusting local clock by 12815.767667s
> Sep 2 19:39:39 dl360-800 ntpd[11652]: adjusting local clock by 2146.184467s
> Sep 2 19:42:15 dl360-800 ntpd[11652]: adjusting local clock by 12808.468644s
> Sep 2 19:44:24 dl360-800 ntpd[11652]: adjusting local clock by 12803.555792s
> Sep 2 19:48:35 dl360-800 ntpd[11652]: adjusting local clock by 12793.891811s
> Sep 2 19:49:05 dl360-800 ntpd[11652]: adjusting local clock by 2146.331378s
> Sep 2 19:52:24 dl360-800 ntpd[11652]: adjusting local clock by 12785.133990s
> Sep 2 19:54:35 dl360-800 ntpd[11652]: adjusting local clock by 12780.066327s
> Sep 2 19:57:49 dl360-800 ntpd[11652]: adjusting local clock by 12772.633362s
> Sep 2 19:58:03 dl360-800 ntpd[12524]: peer 66.90.78.182 now invalid
> Sep 2 19:59:55 dl360-800 ntpd[11652]: adjusting local clock by 2142.660997s
> Sep 2 20:02:37 dl360-800 ntpd[11652]: adjusting local clock by 12761.563360s
> Sep 2 20:03:51 dl360-800 ntpd[12524]: peer 80.33.107.110 now invalid
> Sep 2 20:06:14 dl360-800 ntpd[11652]: adjusting local clock by 12753.236968s
> Sep 2 20:06:44 dl360-800 ntpd[11652]: adjusting local clock by 2146.349621s
> Sep 2 20:08:05 dl360-800 ntpd[12524]: peer 83.170.1.225 now valid
> Sep 2 20:08:54 dl360-800 ntpd[11652]: adjusting local clock by 12747.094516s
> Sep 2 20:11:34 dl360-800 ntpd[11652]: adjusting local clock by 2141.351801s
> Sep 2 20:14:16 dl360-800 ntpd[11652]: adjusting local clock by 12734.758492s
> Sep 2 20:16:54 dl360-800 ntpd[11652]: adjusting local clock by 2141.422381s
> Sep 2 20:17:39 dl360-800 ntpd[12524]: peer 62.206.253.10 now invalid
> Sep 2 20:19:15 dl360-800 ntpd[12524]: peer 84.16.227.200 now invalid
> Sep 2 20:20:09 dl360-800 ntpd[11652]: adjusting local clock by 12721.224346s
> Sep 2 20:23:19 dl360-800 ntpd[11652]: adjusting local clock by 12713.900224s
> Sep 2 20:26:00 dl360-800 ntpd[11652]: adjusting local clock by 12707.740893s
> Sep 2 20:29:42 dl360-800 ntpd[11652]: adjusting local clock by 12699.213421s
> Sep 2 20:30:46 dl360-800 ntpd[11652]: adjusting local clock by 2145.012989s
> Sep 2 20:32:24 dl360-800 ntpd[11652]: adjusting local clock by 2141.239705s
> Sep 2 20:34:34 dl360-800 ntpd[11652]: adjusting local clock by 12687.996888s
> Sep 2 20:36:45 dl360-800 ntpd[11652]: adjusting local clock by 12682.979221s
> Sep 2 20:39:22 dl360-800 ntpd[11652]: adjusting local clock by 2141.444720s
> Sep 2 20:43:12 dl360-800 ntpd[11652]: adjusting local clock by 12668.101465s
> Sep 2 20:46:55 dl360-800 ntpd[11652]: adjusting local clock by 12659.552508s
> Sep 2 20:48:32 dl360-800 ntpd[12524]: peer 66.90.78.182 now valid
> Sep 2 20:51:17 dl360-800 ntpd[11652]: adjusting local clock by 12649.499819s
> Sep 2 20:52:53 dl360-800 ntpd[11652]: adjusting local clock by 2143.790248s
> Sep 2 20:55:33 dl360-800 ntpd[12524]: peer 80.33.107.110 now valid
> Sep 2 20:56:07 dl360-800 ntpd[11652]: adjusting local clock by 12638.382844s
> Sep 2 20:58:43 dl360-800 ntpd[11652]: adjusting local clock by 12632.370112s
> Sep 2 20:59:25 dl360-800 ntpd[12524]: peer 83.170.1.225 now invalid
> Sep 2 20:59:25 dl360-800 ntpd[12524]: peer 80.33.107.110 now invalid
> Sep 2 21:02:52 dl360-800 ntpd[11652]: adjusting local clock by 12622.828492s
> Sep 2 21:05:38 dl360-800 ntpd[11652]: adjusting local clock by 7378.773587s
> Sep 2 21:09:23 dl360-800 ntpd[11652]: adjusting local clock by 12607.826005s
> Sep 2 21:09:31 dl360-800 ntpd[12524]: peer 62.206.253.10 now valid
> Sep 2 21:10:06 dl360-800 ntpd[12524]: peer 84.16.227.200 now valid
> Sep 2 21:11:30 dl360-800 ntpd[11652]: adjusting local clock by 12602.939086s
> Sep 2 21:15:22 dl360-800 ntpd[11652]: adjusting local clock by 12594.059407s
> Sep 2 21:18:46 dl360-800 ntpd[11652]: adjusting local clock by 12586.223555s
> Sep 2 21:21:59 dl360-800 ntpd[11652]: adjusting local clock by 12578.762437s
> Sep 2 21:22:33 dl360-800 ntpd[11652]: adjusting local clock by 2146.198352s
> Sep 2 21:24:20 dl360-800 ntpd[12524]: peer 62.206.253.10 now invalid
> Sep 2 21:26:17 dl360-800 ntpd[11652]: adjusting local clock by 12568.905902s
> Sep 2 21:27:55 dl360-800 ntpd[11652]: adjusting local clock by 2143.713832s
> Sep 2 21:29:31 dl360-800 ntpd[11652]: adjusting local clock by 12561.435933s
> Sep 2 21:31:39 dl360-800 ntpd[11652]: adjusting local clock by 2142.584164s
> Sep 2 21:34:23 dl360-800 ntpd[11652]: adjusting local clock by 12550.226764s
> Sep 2 21:37:07 dl360-800 ntpd[11652]: adjusting local clock by 12543.946758s
> Sep 2 21:39:45 dl360-800 ntpd[11652]: adjusting local clock by 12537.907468s
> Sep 2 21:40:29 dl360-800 ntpd[12524]: peer 24.130.207.189 now invalid
> Sep 2 21:42:30 dl360-800 ntpd[11652]: adjusting local clock by 12531.568861s
> Sep 2 21:45:16 dl360-800 ntpd[11652]: adjusting local clock by 7333.146946s
> Sep 2 21:49:06 dl360-800 ntpd[11652]: adjusting local clock by 12516.352616s
> Sep 2 21:50:35 dl360-800 ntpd[12524]: peer 80.33.107.110 now valid
> Sep 2 21:53:27 dl360-800 ntpd[11652]: adjusting local clock by 12506.329481s
> Sep 2 21:53:41 dl360-800 ntpd[12524]: peer 83.170.1.225 now valid
> Sep 2 21:57:39 dl360-800 ntpd[11652]: adjusting local clock by 12496.678333s
> Sep 2 21:58:11 dl360-800 ntpd[11652]: adjusting local clock by 2146.253974s
> Sep 2 21:59:19 dl360-800 ntpd[11652]: adjusting local clock by 7318.235475s
> Sep 2 22:00:22 dl360-800 ntpd[11652]: adjusting local clock by 2145.055200s
