从大约 2-3 周前开始，ntp 失去了同步，从那以后它每天失去 40 秒到 1 分钟，
然后每天晚上 9 点左右立即同步这个差异。
/var/log/ntp.log ：
8 Jun 09:01:54 ntpd[7688]: kernel time sync status change 4001
8 Jun 09:18:57 ntpd[7688]: kernel time sync status change 0001
8 Jun 09:53:08 ntpd[7688]: kernel time sync status change 4001
8 Jun 10:10:14 ntpd[7688]: kernel time sync status change 0001
8 Jun 12:26:45 ntpd[7688]: kernel time sync status change 4001
8 Jun 12:43:51 ntpd[7688]: kernel time sync status change 0001
8 Jun 14:43:19 ntpd[7688]: kernel time sync status change 4001
8 Jun 15:00:23 ntpd[7688]: kernel time sync status change 0001
8 Jun 16:25:45 ntpd[7688]: kernel time sync status change 4001
8 Jun 16:42:49 ntpd[7688]: kernel time sync status change 0001
8 Jun 17:16:59 ntpd[7688]: kernel time sync status change 4001
8 Jun 17:34:05 ntpd[7688]: kernel time sync status change 0001
8 Jun 19:16:30 ntpd[7688]: kernel time sync status change 4001
8 Jun 19:33:33 ntpd[7688]: kernel time sync status change 0001
8 Jun 20:59:28 ntpd[7688]: synchronized to LOCAL(0), stratum 10
8 Jun 21:17:43 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
**8 Jun 21:33:19 ntpd[7688]: time reset -33.667071 s**
8 Jun 21:37:36 ntpd[7688]: synchronized to LOCAL(0), stratum 10
8 Jun 21:38:40 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
9 Jun 10:56:38 ntpd[7688]: kernel time sync status change 4001
9 Jun 11:13:41 ntpd[7688]: kernel time sync status change 0001
9 Jun 12:04:56 ntpd[7688]: kernel time sync status change 4001
9 Jun 13:47:20 ntpd[7688]: kernel time sync status change 0001
9 Jun 14:21:31 ntpd[7688]: kernel time sync status change 4001
9 Jun 14:38:37 ntpd[7688]: kernel time sync status change 0001
9 Jun 20:11:40 ntpd[7688]: kernel time sync status change 4001
9 Jun 20:45:48 ntpd[7688]: kernel time sync status change 0001
9 Jun 21:03:40 ntpd[7688]: synchronized to LOCAL(0), stratum 10
9 Jun 21:21:35 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
**9 Jun 21:54:16 ntpd[7688]: time reset -35.209243 s**
9 Jun 21:57:54 ntpd[7688]: synchronized to LOCAL(0), stratum 10
9 Jun 21:59:00 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
10 Jun 20:57:04 ntpd[7688]: synchronized to LOCAL(0), stratum 10
10 Jun 21:03:59 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
**10 Jun 21:18:25 ntpd[7688]: time reset -36.757260 s**
10 Jun 21:21:45 ntpd[7688]: synchronized to LOCAL(0), stratum 10
10 Jun 21:23:52 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
11 Jun 21:07:25 ntpd[7688]: synchronized to LOCAL(0), stratum 10
11 Jun 21:24:25 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
**11 Jun 21:40:52 ntpd[7688]: time reset -38.305589 s**
11 Jun 21:44:29 ntpd[7688]: synchronized to LOCAL(0), stratum 10
11 Jun 21:45:33 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
12 Jun 08:37:43 ntpd[7688]: kernel time sync status change 4001
12 Jun 08:50:34 ntpd[7688]: kernel time sync status change 0001
12 Jun 21:01:10 ntpd[7688]: synchronized to LOCAL(0), stratum 10
12 Jun 21:07:53 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
**12 Jun 21:22:13 ntpd[7688]: time reset -39.854883 s**
12 Jun 21:26:19 ntpd[7688]: synchronized to LOCAL(0), stratum 10
12 Jun 21:27:23 ntpd[7688]: synchronized to 172.16.33.74, stratum 3
13 Jun 02:26:51 ntpd[7688]: kernel time sync status change 4001
13 Jun 04:43:29 ntpd[7688]: kernel time sync status change 0001
13 Jun 05:34:43 ntpd[7688]: kernel time sync status change 4001
13 Jun 06:25:57 ntpd[7688]: kernel time sync status change 0001
13 Jun 07:34:16 ntpd[7688]: kernel time sync status change 4001
13 Jun 07:51:21 ntpd[7688]: kernel time sync status change 0001
13 Jun 13:18:34 ntpd[7688]: ntpd exiting on signal 15
13 Jun 13:21:51 ntpd[6771]: synchronized to LOCAL(0), stratum 10
13 Jun 13:21:51 ntpd[6771]: kernel time sync status change 0001
13 Jun 13:23:57 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
13 Jun 21:10:58 ntpd[6771]: synchronized to LOCAL(0), stratum 10
13 Jun 21:27:09 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
**13 Jun 22:00:28 ntpd[6771]: time reset -41.396780 s**
13 Jun 22:00:28 ntpd[6771]: kernel time sync status change 4001
13 Jun 22:04:38 ntpd[6771]: synchronized to LOCAL(0), stratum 10
13 Jun 22:04:38 ntpd[6771]: kernel time sync status change 0001
13 Jun 22:05:44 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
14 Jun 04:09:19 ntpd[6771]: kernel time sync status change 4001
14 Jun 04:43:27 ntpd[6771]: kernel time sync status change 0001
14 Jun 06:08:50 ntpd[6771]: kernel time sync status change 4001
14 Jun 06:25:55 ntpd[6771]: kernel time sync status change 0001
14 Jun 07:00:05 ntpd[6771]: kernel time sync status change 4001
14 Jun 07:51:19 ntpd[6771]: kernel time sync status change 0001
14 Jun 08:25:28 ntpd[6771]: kernel time sync status change 4001
14 Jun 08:42:31 ntpd[6771]: kernel time sync status change 0001
14 Jun 10:59:05 ntpd[6771]: kernel time sync status change 4001
14 Jun 11:16:11 ntpd[6771]: kernel time sync status change 0001
14 Jun 12:24:27 ntpd[6771]: kernel time sync status change 4001
14 Jun 12:33:00 ntpd[6771]: kernel time sync status change 0001
14 Jun 16:40:51 ntpd[6771]: kernel time sync status change 4001
14 Jun 16:57:55 ntpd[6771]: kernel time sync status change 0001
14 Jun 17:49:11 ntpd[6771]: kernel time sync status change 4001
14 Jun 18:57:29 ntpd[6771]: kernel time sync status change 0001
14 Jun 19:31:38 ntpd[6771]: kernel time sync status change 4001
14 Jun 19:40:10 ntpd[6771]: kernel time sync status change 0001
14 Jun 20:56:52 ntpd[6771]: synchronized to LOCAL(0), stratum 10
14 Jun 21:03:37 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
**14 Jun 21:16:53 ntpd[6771]: time reset -42.943002 s**
14 Jun 21:20:34 ntpd[6771]: synchronized to LOCAL(0), stratum 10
14 Jun 21:21:39 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
15 Jun 04:57:42 ntpd[6771]: kernel time sync status change 4001
15 Jun 05:14:47 ntpd[6771]: kernel time sync status change 0001
15 Jun 06:23:10 ntpd[6771]: kernel time sync status change 4001
15 Jun 06:57:17 ntpd[6771]: kernel time sync status change 0001
15 Jun 09:13:47 ntpd[6771]: kernel time sync status change 4001
15 Jun 11:13:19 ntpd[6771]: kernel time sync status change 0001
15 Jun 12:04:32 ntpd[6771]: kernel time sync status change 4001
15 Jun 12:21:38 ntpd[6771]: kernel time sync status change 0001
15 Jun 13:12:54 ntpd[6771]: kernel time sync status change 4001
15 Jun 13:55:37 ntpd[6771]: kernel time sync status change 0001
15 Jun 15:55:11 ntpd[6771]: kernel time sync status change 4001
15 Jun 16:12:14 ntpd[6771]: kernel time sync status change 0001
15 Jun 20:59:18 ntpd[6771]: synchronized to LOCAL(0), stratum 10
15 Jun 21:21:16 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
15 Jun 21:54:18 ntpd[6771]: time reset -44.484272 s
15 Jun 21:58:27 ntpd[6771]: synchronized to LOCAL(0), stratum 10
15 Jun 21:59:30 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
16 Jun 03:53:30 ntpd[6771]: kernel time sync status change 4001
16 Jun 04:44:45 ntpd[6771]: kernel time sync status change 0001
16 Jun 05:53:03 ntpd[6771]: kernel time sync status change 4001
16 Jun 07:01:18 ntpd[6771]: kernel time sync status change 0001
16 Jun 08:26:43 ntpd[6771]: kernel time sync status change 4001
16 Jun 08:43:49 ntpd[6771]: kernel time sync status change 0001
16 Jun 09:35:06 ntpd[6771]: kernel time sync status change 4001
16 Jun 09:52:09 ntpd[6771]: kernel time sync status change 0001
16 Jun 10:26:19 ntpd[6771]: kernel time sync status change 4001
16 Jun 11:00:27 ntpd[6771]: kernel time sync status change 0001
16 Jun 11:34:37 ntpd[6771]: kernel time sync status change 4001
16 Jun 11:51:41 ntpd[6771]: kernel time sync status change 0001
16 Jun 12:42:59 ntpd[6771]: kernel time sync status change 4001
16 Jun 13:00:03 ntpd[6771]: kernel time sync status change 0001
16 Jun 14:25:25 ntpd[6771]: kernel time sync status change 4001
16 Jun 15:16:39 ntpd[6771]: kernel time sync status change 0001
16 Jun 16:24:57 ntpd[6771]: kernel time sync status change 4001
16 Jun 17:16:09 ntpd[6771]: kernel time sync status change 0001
16 Jun 18:58:35 ntpd[6771]: kernel time sync status change 4001
16 Jun 19:15:40 ntpd[6771]: kernel time sync status change 0001
16 Jun 20:59:36 ntpd[6771]: synchronized to LOCAL(0), stratum 10
16 Jun 21:16:46 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
16 Jun 21:49:33 ntpd[6771]: time reset -46.023214 s
16 Jun 21:52:53 ntpd[6771]: synchronized to LOCAL(0), stratum 10
16 Jun 21:53:57 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
17 Jun 03:12:33 ntpd[6771]: kernel time sync status change 4001
17 Jun 03:29:36 ntpd[6771]: kernel time sync status change 0001
17 Jun 04:20:49 ntpd[6771]: kernel time sync status change 4001
17 Jun 05:12:01 ntpd[6771]: kernel time sync status change 0001
17 Jun 07:28:37 ntpd[6771]: kernel time sync status change 4001
17 Jun 08:02:43 ntpd[6771]: kernel time sync status change 0001
17 Jun 09:28:07 ntpd[6771]: kernel time sync status change 4001
17 Jun 10:02:13 ntpd[6771]: kernel time sync status change 0001
17 Jun 11:10:31 ntpd[6771]: kernel time sync status change 4001
17 Jun 11:27:36 ntpd[6771]: kernel time sync status change 0001
17 Jun 17:01:37 ntpd[6771]: kernel time sync status change 4001
17 Jun 17:18:42 ntpd[6771]: kernel time sync status change 0001
17 Jun 20:09:32 ntpd[6771]: kernel time sync status change 4001
17 Jun 21:01:48 ntpd[6771]: synchronized to LOCAL(0), stratum 10
17 Jun 21:01:48 ntpd[6771]: kernel time sync status change 0001
17 Jun 21:19:34 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
17 Jun 21:52:12 ntpd[6771]: time reset -47.573538 s
17 Jun 21:56:07 ntpd[6771]: synchronized to LOCAL(0), stratum 10
17 Jun 21:57:11 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
18 Jun 20:59:25 ntpd[6771]: synchronized to LOCAL(0), stratum 10
18 Jun 21:24:16 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
18 Jun 21:40:42 ntpd[6771]: time reset -49.122802 s
18 Jun 21:44:59 ntpd[6771]: synchronized to LOCAL(0), stratum 10
18 Jun 21:46:03 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
19 Jun 09:30:18 ntpd[6771]: kernel time sync status change 4001
19 Jun 11:12:46 ntpd[6771]: kernel time sync status change 0001
19 Jun 11:46:55 ntpd[6771]: kernel time sync status change 4001
19 Jun 12:38:10 ntpd[6771]: kernel time sync status change 0001
19 Jun 14:03:33 ntpd[6771]: kernel time sync status change 4001
19 Jun 14:20:36 ntpd[6771]: kernel time sync status change 0001
19 Jun 15:11:48 ntpd[6771]: kernel time sync status change 4001
19 Jun 15:45:55 ntpd[6771]: kernel time sync status change 0001
19 Jun 16:20:04 ntpd[6771]: kernel time sync status change 4001
19 Jun 16:37:08 ntpd[6771]: kernel time sync status change 0001
19 Jun 17:11:19 ntpd[6771]: kernel time sync status change 4001
19 Jun 17:28:24 ntpd[6771]: kernel time sync status change 0001
19 Jun 19:36:29 ntpd[6771]: kernel time sync status change 4001
19 Jun 19:53:33 ntpd[6771]: kernel time sync status change 0001
19 Jun 21:02:58 ntpd[6771]: synchronized to LOCAL(0), stratum 10
19 Jun 21:20:53 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
19 Jun 21:37:16 ntpd[6771]: time reset -50.669270 s
19 Jun 21:41:34 ntpd[6771]: synchronized to LOCAL(0), stratum 10
19 Jun 21:42:07 ntpd[6771]: synchronized to 172.16.33.74, stratum 3
此时我设置了一个 cron 作业以每小时运行一次 ntpdate：
20 Jun 17:57:39 ntpdate[22583]: adjust time server 172.16.33.74 offset -0.000421 sec
20 Jun 18:01:01 ntpdate[22623]: adjust time server 172.16.33.74 offset 0.000238 sec
20 Jun 19:01:01 ntpdate[23046]: adjust time server 172.16.33.74 offset 0.000753 sec
20 Jun 20:01:02 ntpdate[23471]: adjust time server 172.16.33.74 offset 0.000574 sec
20 Jun 21:00:09 ntpdate[23890]: step time server 172.16.33.74 offset -52.211231 sec
20 Jun 21:01:01 ntpdate[23909]: adjust time server 172.16.33.74 offset 0.000033 sec
20 Jun 22:01:01 ntpdate[24332]: adjust time server 172.16.33.74 offset 0.000870 sec
20 Jun 23:01:02 ntpdate[24757]: adjust time server 172.16.33.74 offset 0.000499 sec
21 Jun 00:01:01 ntpdate[25188]: adjust time server 172.16.33.74 offset 0.004997 sec
21 Jun 01:01:01 ntpdate[25611]: adjust time server 172.16.33.74 offset -0.000058 sec
21 Jun 02:01:01 ntpdate[26035]: adjust time server 172.16.33.74 offset 0.001489 sec
21 Jun 03:01:01 ntpdate[26460]: adjust time server 172.16.33.74 offset 0.000491 sec
21 Jun 04:01:01 ntpdate[27712]: adjust time server 172.16.33.74 offset 0.000730 sec
21 Jun 05:01:01 ntpdate[28270]: adjust time server 172.16.33.74 offset 0.000841 sec
21 Jun 06:01:01 ntpdate[28753]: adjust time server 172.16.33.74 offset 0.000405 sec
21 Jun 07:01:01 ntpdate[29177]: adjust time server 172.16.33.74 offset 0.000474 sec
21 Jun 08:01:01 ntpdate[29601]: adjust time server 172.16.33.74 offset 0.000583 sec
21 Jun 09:01:01 ntpdate[30024]: adjust time server 172.16.33.74 offset 0.000660 sec
21 Jun 10:01:01 ntpdate[30448]: adjust time server 172.16.33.74 offset 0.000469 sec
21 Jun 11:01:01 ntpdate[30872]: adjust time server 172.16.33.74 offset 0.000605 sec
21 Jun 12:01:01 ntpdate[31298]: adjust time server 172.16.33.74 offset 0.000159 sec
21 Jun 13:01:01 ntpdate[31721]: adjust time server 172.16.33.74 offset 0.000539 sec
21 Jun 14:01:01 ntpdate[32146]: adjust time server 172.16.33.74 offset 0.000530 sec
21 Jun 15:01:01 ntpdate[32570]: adjust time server 172.16.33.74 offset 0.000560 sec
21 Jun 16:01:01 ntpdate[583]: adjust time server 172.16.33.74 offset 0.000820 sec
21 Jun 17:01:01 ntpdate[1020]: adjust time server 172.16.33.74 offset 0.000512 sec
21 Jun 18:01:01 ntpdate[1445]: adjust time server 172.16.33.74 offset 0.000239 sec
21 Jun 19:01:01 ntpdate[1870]: adjust time server 172.16.33.74 offset 0.000607 sec
21 Jun 20:01:01 ntpdate[2294]: adjust time server 172.16.33.74 offset 0.000717 sec
21 Jun 21:01:02 ntpdate[2743]: adjust time server 172.16.33.74 offset 0.000965 sec
21 Jun 22:00:07 ntpdate[3174]: step time server 172.16.33.74 offset -53.812615 sec
21 Jun 22:01:01 ntpdate[3196]: adjust time server 172.16.33.74 offset 0.000024 sec
21 Jun 23:01:01 ntpdate[3641]: adjust time server 172.16.33.74 offset 0.000496 sec
22 Jun 00:01:01 ntpdate[4133]: adjust time server 172.16.33.74 offset 0.000920 sec
22 Jun 01:01:01 ntpdate[4557]: adjust time server 172.16.33.74 offset 0.000914 sec
22 Jun 02:01:01 ntpdate[4980]: adjust time server 172.16.33.74 offset 0.000702 sec
22 Jun 03:01:01 ntpdate[5404]: adjust time server 172.16.33.74 offset 0.000663 sec
22 Jun 04:01:01 ntpdate[6631]: adjust time server 172.16.33.74 offset 0.000608 sec
22 Jun 05:01:01 ntpdate[7189]: adjust time server 172.16.33.74 offset 0.000650 sec
22 Jun 06:01:01 ntpdate[7613]: adjust time server 172.16.33.74 offset 0.000895 sec
22 Jun 07:01:01 ntpdate[8037]: adjust time server 172.16.33.74 offset 0.000843 sec
22 Jun 08:01:01 ntpdate[8462]: adjust time server 172.16.33.74 offset 0.000559 sec
22 Jun 09:01:01 ntpdate[8885]: adjust time server 172.16.33.74 offset 0.000595 sec
22 Jun 10:01:01 ntpdate[9309]: adjust time server 172.16.33.74 offset 0.000617 sec
22 Jun 11:01:01 ntpdate[9734]: adjust time server 172.16.33.74 offset 0.000527 sec
22 Jun 12:01:01 ntpdate[10158]: adjust time server 172.16.33.74 offset 0.000546 sec
22 Jun 13:01:01 ntpdate[10582]: adjust time server 172.16.33.74 offset 0.000663 sec
22 Jun 14:01:01 ntpdate[11006]: adjust time server 172.16.33.74 offset 0.000790 sec
22 Jun 15:01:01 ntpdate[11429]: adjust time server 172.16.33.74 offset 0.000599 sec
22 Jun 16:01:01 ntpdate[11854]: adjust time server 172.16.33.74 offset 0.001093 sec
22 Jun 17:01:02 ntpdate[12277]: adjust time server 172.16.33.74 offset 0.000444 sec
22 Jun 18:01:01 ntpdate[12702]: adjust time server 172.16.33.74 offset 0.001054 sec
22 Jun 19:01:01 ntpdate[13126]: adjust time server 172.16.33.74 offset 0.000751 sec
22 Jun 20:01:01 ntpdate[13550]: adjust time server 172.16.33.74 offset 0.000832 sec
22 Jun 21:01:01 ntpdate[13973]: adjust time server 172.16.33.74 offset 0.001551 sec
22 Jun 22:00:06 ntpdate[14398]: step time server 172.16.33.74 offset -55.338569 sec
22 Jun 22:01:01 ntpdate[14418]: adjust time server 172.16.33.74 offset 0.000044 sec
22 Jun 23:01:01 ntpdate[14845]: adjust time server 172.16.33.74 offset 0.000949 sec
23 Jun 00:01:01 ntpdate[15276]: adjust time server 172.16.33.74 offset 0.000699 sec
23 Jun 01:01:01 ntpdate[15700]: adjust time server 172.16.33.74 offset 0.001248 sec
23 Jun 02:01:01 ntpdate[16123]: adjust time server 172.16.33.74 offset 0.001125 sec
23 Jun 03:01:02 ntpdate[16547]: adjust time server 172.16.33.74 offset -0.000017 sec
23 Jun 04:01:01 ntpdate[17812]: adjust time server 172.16.33.74 offset 0.000511 sec
23 Jun 05:01:01 ntpdate[18371]: adjust time server 172.16.33.74 offset 0.000460 sec
23 Jun 06:01:01 ntpdate[18795]: adjust time server 172.16.33.74 offset 0.000756 sec
23 Jun 07:01:01 ntpdate[19219]: adjust time server 172.16.33.74 offset 0.000756 sec
23 Jun 08:01:01 ntpdate[19643]: adjust time server 172.16.33.74 offset 0.000925 sec
23 Jun 09:01:01 ntpdate[20066]: adjust time server 172.16.33.74 offset 0.000770 sec
23 Jun 10:01:01 ntpdate[20491]: adjust time server 172.16.33.74 offset 0.000929 sec
23 Jun 11:01:01 ntpdate[20915]: adjust time server 172.16.33.74 offset 0.001033 sec
23 Jun 12:01:01 ntpdate[21339]: adjust time server 172.16.33.74 offset 0.000177 sec
23 Jun 13:01:01 ntpdate[21763]: adjust time server 172.16.33.74 offset 0.000831 sec
23 Jun 14:01:01 ntpdate[22187]: adjust time server 172.16.33.74 offset 0.000671 sec
23 Jun 15:01:01 ntpdate[22611]: adjust time server 172.16.33.74 offset 0.000742 sec
23 Jun 16:01:01 ntpdate[23034]: adjust time server 172.16.33.74 offset 0.000978 sec
23 Jun 17:01:01 ntpdate[23459]: adjust time server 172.16.33.74 offset 0.000954 sec
23 Jun 18:01:02 ntpdate[23882]: adjust time server 172.16.33.74 offset 0.000546 sec
23 Jun 19:01:01 ntpdate[24307]: adjust time server 172.16.33.74 offset 0.001156 sec
23 Jun 20:01:01 ntpdate[24731]: adjust time server 172.16.33.74 offset 0.000255 sec
23 Jun 21:01:02 ntpdate[25155]: adjust time server 172.16.33.74 offset 0.001095 sec
23 Jun 22:00:04 ntpdate[25579]: step time server 172.16.33.74 offset -56.876308 sec
23 Jun 22:01:01 ntpdate[25600]: adjust time server 172.16.33.74 offset 0.000056 sec
23 Jun 23:01:01 ntpdate[26019]: adjust time server 172.16.33.74 offset 0.001729 sec
24 Jun 00:01:02 ntpdate[26450]: adjust time server 172.16.33.74 offset 0.000364 sec
然后每5分钟添加一次cron：
24 Jun 22:00:01 ntpdate[5200]: adjust time server 172.16.33.74 offset 0.000874 sec
24 Jun 22:01:01 ntpdate[5217]: adjust time server 172.16.33.74 offset -0.000417 sec
24 Jun 22:05:01 ntpdate[5250]: adjust time server 172.16.33.74 offset 0.000289 sec
24 Jun 22:10:01 ntpdate[5288]: adjust time server 172.16.33.74 offset -0.000060 sec
**24 Jun 22:14:02 ntpdate[5326]: step time server 172.16.33.74 offset -58.428188 sec**
24 Jun 22:15:01 ntpdate[5332]: adjust time server 172.16.33.74 offset 0.000055 sec
**24 Jun 22:19:02 ntpdate[5372]: step time server 172.16.33.74 offset -58.458807 sec**
24 Jun 22:20:02 ntpdate[5380]: adjust time server 172.16.33.74 offset 0.000030 sec
24 Jun 22:25:01 ntpdate[5416]: adjust time server 172.16.33.74 offset 0.000078 sec
24 Jun 22:30:01 ntpdate[5454]: adjust time server 172.16.33.74 offset 0.000039 sec
24 Jun 22:35:01 ntpdate[5490]: adjust time server 172.16.33.74 offset 0.000058 sec
24 Jun 22:40:01 ntpdate[5530]: adjust time server 172.16.33.74 offset 0.000038 sec
24 Jun 22:45:01 ntpdate[5566]: adjust time server 172.16.33.74 offset 0.000055 sec
24 Jun 22:50:01 ntpdate[5604]: adjust time server 172.16.33.74 offset 0.000039 sec
24 Jun 22:55:01 ntpdate[5640]: adjust time server 172.16.33.74 offset 0.000060 sec
24 Jun 23:01:01 ntpdate[5693]: adjust time server 172.16.33.74 offset 0.000043 sec
有两次时钟几乎跳过了 1 分钟。
已经检查了服务器上的其他日志文件，并且此时除了 ntp.log 之外，实际上没有任何数据写入任何日志。
此时没有备份任务等正在运行。
服务器是 VMWARE 虚拟机，与主机的时间同步已被禁用。
服务器操作系统是 openfiler 2.3
uname -a
Linux xxxxxxxxxxxxxxxxxxx 2.6.29.6-0.23.smp.gcc3.4.x86.i686 #1 SMP Mon Feb 8 16:28:15 GMT 2010 i686 i686 i386 GNU/Linux