要因としては、新品マシンで drift 値 (/var/lib/ntpd/drift に格納される) が定まっていない点、WiFi 環境や高度な省電力機能の影響 など想像しましたが、想像したところで原因特定は難しいし、そこまで時間を割いてもいられないので、よくある対処療法 (maxpoll 設定) を行いました。
まず、どうなっていたかというと、「frequency error -561 PPM exceeds tolerance 500 PPM」というメッセージが出続けていました。
[root@hoge act27m48_1]# grep ntpd messages-20171225 Dec 19 06:48:27 hoge ntpd[31716]: ntpd 4.2.6p5@1.2349-o Wed Apr 12 21:24:06 UTC 2017 (1) Dec 19 06:48:27 hoge ntpd[31717]: proto: precision = 0.046 usec Dec 19 06:48:27 hoge ntpd[31717]: 0.0.0.0 c01d 0d kern kernel time sync enabled Dec 19 06:48:27 hoge ntpd[31717]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listen and drop on 1 v6wildcard :: UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listen normally on 2 lo 127.0.0.1 UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listen normally on 3 wlp4s0 192.168.1.41 UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listen normally on 4 virbr0 192.168.122.1 UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listen normally on 5 lo ::1 UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listen normally on 6 wlp4s0 fe80::e1c7:557d:897c:9baf UDP 123 Dec 19 06:48:27 hoge ntpd[31717]: Listening on routing socket on fd #23 for interface updates Dec 19 06:48:28 hoge ntpd[31717]: 0.0.0.0 c016 06 restart Dec 19 06:48:28 hoge ntpd[31717]: 0.0.0.0 c012 02 freq_set ntpd 0.000 PPM Dec 19 06:48:28 hoge ntpd[31717]: 0.0.0.0 c011 01 freq_not_set Dec 19 06:48:34 hoge ntpd[31717]: 0.0.0.0 c614 04 freq_mode Dec 19 07:11:03 hoge ntpd[31717]: 0.0.0.0 0612 02 freq_set ntpd -3983.969 PPM Dec 19 07:11:03 hoge ntpd[31717]: 0.0.0.0 0615 05 clock_sync Dec 19 07:11:03 hoge ntpd[31717]: frequency error -3984 PPM exceeds tolerance 500 PPM Dec 19 07:13:21 hoge ntpd[31717]: frequency error -561 PPM exceeds tolerance 500 PPM Dec 19 07:16:41 hoge ntpd[31717]: frequency error -586 PPM exceeds tolerance 500 PPM Dec 19 07:22:25 hoge ntpd[31717]: frequency error -646 PPM exceeds tolerance 500 PPM Dec 19 07:24:35 hoge ntpd[31717]: frequency error -554 PPM exceeds tolerance 500 PPM Dec 19 07:37:56 hoge ntpd[31717]: frequency error -578 PPM exceeds tolerance 500 PPM Dec 19 07:46:26 hoge ntpd[31717]: frequency error -550 PPM exceeds tolerance 500 PPM Dec 19 07:53:11 hoge ntpd[31717]: frequency error -537 PPM exceeds tolerance 500 PPM Dec 19 07:53:12 hoge ntpd[31717]: frequency error -500 PPM exceeds tolerance 500 PPM Dec 19 08:04:12 hoge ntpd[31717]: 0.0.0.0 0618 08 no_sys_peer Dec 19 08:08:29 hoge ntpd[31717]: frequency error -577 PPM exceeds tolerance 500 PPM Dec 19 08:28:19 hoge ntpd[31717]: frequency error -523 PPM exceeds tolerance 500 PPM Dec 19 08:41:28 hoge ntpd[31717]: frequency error -515 PPM exceeds tolerance 500 PPM Dec 19 08:57:00 hoge ntpd[31717]: frequency error -517 PPM exceeds tolerance 500 PPM Dec 19 09:09:39 hoge ntpd[31717]: frequency error -513 PPM exceeds tolerance 500 PPM Dec 19 09:16:14 hoge ntpd[31717]: frequency error -502 PPM exceeds tolerance 500 PPM Dec 19 09:25:17 hoge ntpd[31717]: frequency error -502 PPM exceeds tolerance 500 PPM Dec 19 09:40:57 hoge ntpd[31717]: frequency error -503 PPM exceeds tolerance 500 PPM Dec 19 09:44:45 hoge ntpd[31717]: frequency error -501 PPM exceeds tolerance 500 PPM Dec 19 10:08:51 hoge ntpd[31717]: frequency error -501 PPM exceeds tolerance 500 PPM Dec 19 10:33:49 hoge ntpd[31717]: frequency error -501 PPM exceeds tolerance 500 PPM Dec 19 10:44:29 hoge ntpd[31717]: 0.0.0.0 0628 08 no_sys_peer Dec 20 22:24:33 hoge ntpd[31717]: ntpd exiting on signal 15 Dec 20 22:26:07 hoge ntpd[7956]: ntpd 4.2.6p5@1.2349-o Wed Apr 12 21:24:06 UTC 2017 (1) Dec 20 22:26:07 hoge ntpd[7957]: proto: precision = 0.046 usec Dec 20 22:26:07 hoge ntpd[7957]: 0.0.0.0 c01d 0d kern kernel time sync enabled Dec 20 22:26:07 hoge ntpd[7957]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listen and drop on 1 v6wildcard :: UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listen normally on 2 lo 127.0.0.1 UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listen normally on 3 wlp4s0 192.168.1.41 UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listen normally on 4 virbr0 192.168.122.1 UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listen normally on 5 lo ::1 UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listen normally on 6 wlp4s0 fe80::e1c7:557d:897c:9baf UDP 123 Dec 20 22:26:07 hoge ntpd[7957]: Listening on routing socket on fd #23 for interface updates Dec 20 22:26:07 hoge ntpd[7957]: 0.0.0.0 c016 06 restart Dec 20 22:26:07 hoge ntpd[7957]: 0.0.0.0 c012 02 freq_set ntpd 0.000 PPM Dec 20 22:26:07 hoge ntpd[7957]: 0.0.0.0 c011 01 freq_not_set Dec 20 22:26:15 hoge ntpd[7957]: 0.0.0.0 c614 04 freq_mode Dec 20 22:47:32 hoge ntpd[7957]: 0.0.0.0 0612 02 freq_set ntpd 36169.073 PPM Dec 20 22:47:32 hoge ntpd[7957]: 0.0.0.0 0615 05 clock_sync Dec 20 22:47:32 hoge ntpd[7957]: frequency error 36169 PPM exceeds tolerance 500 PPM Dec 20 22:54:13 hoge ntpd[7957]: frequency error 2051 PPM exceeds tolerance 500 PPM Dec 20 22:56:29 hoge ntpd[7957]: frequency error 1025 PPM exceeds tolerance 500 PPM Dec 20 22:59:51 hoge ntpd[7957]: frequency error 1277 PPM exceeds tolerance 500 PPM Dec 20 23:03:11 hoge ntpd[7957]: frequency error 1269 PPM exceeds tolerance 500 PPM Dec 20 23:04:20 hoge ntpd[7957]: frequency error 566 PPM exceeds tolerance 500 PPM Dec 20 23:08:46 hoge ntpd[7957]: frequency error 755 PPM exceeds tolerance 500 PPM Dec 20 23:26:10 hoge ntpd[7957]: frequency error 1495 PPM exceeds tolerance 500 PPM Dec 20 23:35:04 hoge ntpd[7957]: frequency error 1006 PPM exceeds tolerance 500 PPM Dec 20 23:43:43 hoge ntpd[7957]: frequency error 990 PPM exceeds tolerance 500 PPM Dec 21 00:01:10 hoge ntpd[7957]: frequency error 1482 PPM exceeds tolerance 500 PPM ... Dec 22 11:54:14 hoge ntpd[7957]: frequency error 510 PPM exceeds tolerance 500 PPM Dec 22 11:55:20 hoge ntpd[7957]: frequency error 501 PPM exceeds tolerance 500 PPM Dec 22 12:04:10 hoge ntpd[7957]: frequency error 500 PPM exceeds tolerance 500 PPMそして、ntpq -np の定期採取データでは、次のように offset が大きくなり続けている状態でした。
[root@hoge act27m48_1]# zcat actlog/ntpq-np.7.gz | reduce_actlog -i 7200 2017-12-20 03:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 03:21:12 ============================================================================== 2017-12-20 03:21:12 157.7.208.12 133.243.238.244 2 u 803 1024 377 21.591 29171.2 1948.21 2017-12-20 03:21:12 157.7.153.56 133.243.238.244 2 u 394 1024 77 49.348 29404.9 2474.12 2017-12-20 03:21:12 162.210.110.4 216.218.254.202 2 u 436 1024 367 187.280 29898.2 2892.76 2017-12-20 03:21:12 203.112.17.81 203.112.1.4 4 u 206 1024 377 22.303 30034.7 2416.41 2017-12-20 05:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 05:21:12 ============================================================================== 2017-12-20 05:21:12 157.7.208.12 133.243.238.244 2 u 577 1024 377 21.715 33002.6 1976.60 2017-12-20 05:21:12 157.7.153.56 133.243.238.244 2 u 236 1024 377 18.845 33191.1 1962.56 2017-12-20 05:21:12 162.210.110.4 216.218.192.202 2 u 243 1024 377 171.204 33157.1 2007.93 2017-12-20 05:21:12 203.112.17.81 203.112.1.4 4 u 980 1024 377 23.695 33348.4 2461.91 2017-12-20 07:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 07:21:12 ============================================================================== 2017-12-20 07:21:12 157.7.208.12 133.243.238.244 2 u 471 1024 377 23.319 37320.8 2407.92 2017-12-20 07:21:12 157.7.153.56 10.84.87.146 2 u 63 1024 377 17.479 36987.7 1952.78 2017-12-20 07:21:12 162.210.110.4 216.218.192.202 2 u 1029 1024 377 174.197 37022.4 2489.83 2017-12-20 07:21:12 203.112.17.81 203.112.1.4 4 u 832 1024 377 37.843 36601.8 1961.26 2017-12-20 09:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 09:21:12 ============================================================================== 2017-12-20 09:21:12 157.7.208.12 133.243.238.243 2 u 302 1024 377 23.595 41119.4 2428.08 2017-12-20 09:21:12 157.7.153.56 133.243.238.243 2 u 951 1024 377 20.092 40783.7 2421.30 2017-12-20 09:21:12 162.210.110.4 216.218.254.202 2 u 861 1024 357 227.002 40794.2 2819.32 2017-12-20 09:21:12 203.112.17.81 203.112.1.4 4 u 593 1024 367 24.574 40960.9 2878.66 2017-12-20 11:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 11:21:12 ============================================================================== 2017-12-20 11:21:12 157.7.208.12 133.243.238.244 2 u 167 1024 375 24.937 44902.5 2908.56 2017-12-20 11:21:12 157.7.153.56 103.1.106.69 2 u 721 1024 377 23.686 44656.0 2485.00 2017-12-20 11:21:12 162.210.110.4 216.218.254.202 2 u 673 1024 377 168.522 41373.8 1917.92 2017-12-20 11:21:12 203.112.17.81 203.112.1.4 4 u 353 1024 357 27.599 44798.3 2838.39 2017-12-20 13:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 13:21:12 ============================================================================== 2017-12-20 13:21:12 157.7.208.12 133.243.238.244 2 u 947 1024 137 23.724 47656.8 2561.88 2017-12-20 13:21:12 157.7.153.56 133.243.238.164 2 u 517 1024 375 20.906 48433.1 2923.86 2017-12-20 13:21:12 162.210.110.4 216.218.254.202 2 u 398 1024 377 161.771 47935.8 2050.31 2017-12-20 13:21:12 203.112.17.81 203.112.1.4 4 u 149 1024 377 21.381 48623.0 2463.45 2017-12-20 15:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 15:21:12 ============================================================================== 2017-12-20 15:21:12 157.7.208.12 133.243.238.244 2 u 757 1024 367 25.141 52019.7 2874.31 2017-12-20 15:21:12 157.7.153.56 133.243.238.163 2 u 279 1024 377 22.055 52265.0 2455.92 2017-12-20 15:21:12 162.210.110.4 216.218.192.202 2 u 243 1024 377 198.720 52260.0 2454.19 2017-12-20 15:21:12 203.112.17.81 203.112.1.4 4 u 1026 1024 337 22.962 51880.8 2753.55 2017-12-20 17:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 17:21:12 ============================================================================== 2017-12-20 17:21:12 157.7.208.12 133.243.238.244 2 u 606 1024 377 20.566 55803.7 2421.95 2017-12-20 17:21:12 157.7.153.56 133.243.238.243 2 u 28 1024 377 28.573 55573.5 1999.49 2017-12-20 17:21:12 162.210.110.4 216.218.192.202 2 u 54 1024 377 199.352 55004.9 1610.15 2017-12-20 17:21:12 203.112.17.81 203.112.1.4 4 u 1924 1024 376 21.054 54573.8 1958.08 2017-12-20 19:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 19:21:12 ============================================================================== 2017-12-20 19:21:12 157.7.208.12 133.243.238.243 2 u 466 1024 377 20.950 59584.6 2416.40 2017-12-20 19:21:12 157.7.153.56 103.1.106.69 2 u 1955 1024 356 22.742 58262.9 2388.64 2017-12-20 19:21:12 162.210.110.4 216.218.192.202 2 u 957 1024 377 212.612 59303.4 2445.12 2017-12-20 19:21:12 203.112.17.81 203.112.1.4 4 u 711 1024 175 63.793 59463.6 3142.28 2017-12-20 21:21:12 remote refid st t when poll reach delay offset jitter 2017-12-20 21:21:12 ============================================================================== 2017-12-20 21:21:12 157.7.208.12 133.243.238.244 2 u 245 1024 377 24.519 62854.3 1972.96 2017-12-20 21:21:12 157.7.153.56 10.84.87.146 2 u 1818 1024 156 26.158 62048.7 2702.15 2017-12-20 21:21:12 162.210.110.4 216.218.254.202 2 u 778 1024 377 319.841 63048.6 2401.36 2017-12-20 21:21:12 203.112.17.81 203.112.1.4 4 u 1558 1024 202 79.498 62739.2 4552.75施した設定は次の通りです。
[root@hoge act27m48_1]# less actlog/trackfile/2017-12/23-Sat-0341.diff.gz ... -TOP 0100644 root root 2017-04-12 22:25:40 /etc/ntp.conf +TOP 0100644 root root 2017-12-20 22:25:53 /etc/ntp.conf ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # For more information about this file, see the man pages # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5). @@ -56296,10 +51027,10 @@ # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). -server 0.centos.pool.ntp.org iburst -server 1.centos.pool.ntp.org iburst -server 2.centos.pool.ntp.org iburst -server 3.centos.pool.ntp.org iburst +server 0.centos.pool.ntp.org iburst maxpoll 7 +server 1.centos.pool.ntp.org iburst maxpoll 7 +server 2.centos.pool.ntp.org iburst maxpoll 7 +server 3.centos.pool.ntp.org iburst maxpoll 7 #broadcast 192.168.1.255 autokey # broadcast server #broadcastclient # broadcast client @@ -62182,6 +56913,532 @@こちらを設定後に、drift 値をリセットして再起動 (2017-12-20 22:26頃) しました。下記は、bash の history から振り返りです。echo 0 > /var/lib/ntp/drift でもいいはずですが、この時は削除してました。
[root@hoge ~]# rm /var/lib/ntp/drift [root@hoge ~]# systemctl start ntpd.service次は、収束に向かった時間帯のデータです。
[root@hoge act27m48_1]# zcat actlog/ntpq-np.{6,5,4}.gz | reduce_actlog -i 14400
2017-12-21 03:27:12 remote refid st t when poll reach delay offset jitter
2017-12-21 03:27:12 ==============================================================================
2017-12-21 03:27:12 +88.198.12.78 254.48.138.1 2 u 16 64 377 345.262 56792.7 70.685
2017-12-21 03:27:12 +62.168.65.36 10.0.0.1 4 u 42 64 377 347.361 56808.1 95.757
2017-12-21 03:27:12 *160.16.75.242 103.1.106.69 2 u 50 64 377 17.471 56932.2 92.188
2017-12-21 03:27:12 +77.78.107.252 193.79.237.14 2 u 21 64 377 345.141 56783.5 74.145
2017-12-21 07:27:12 remote refid st t when poll reach delay offset jitter
2017-12-21 07:27:12 ==============================================================================
2017-12-21 07:27:12 +88.198.12.78 192.53.103.108 2 u 61 64 377 320.188 49880.2 104.438
2017-12-21 07:27:12 +62.168.65.36 10.0.0.1 4 u 6 64 377 377.985 49867.2 97.867
2017-12-21 07:27:12 *160.16.75.242 103.1.106.69 2 u 56 64 377 18.170 49860.1 93.587
2017-12-21 07:27:12 +77.78.107.252 193.79.237.14 2 u 18 64 377 291.710 49848.3 75.983
2017-12-21 11:27:12 remote refid st t when poll reach delay offset jitter
2017-12-21 11:27:12 ==============================================================================
2017-12-21 11:27:12 +88.198.12.78 192.53.103.108 2 u 3 64 377 331.510 42933.5 136.385
2017-12-21 11:27:12 -62.168.65.36 10.0.0.1 4 u 57 64 377 333.708 42801.5 91.268
2017-12-21 11:27:12 *160.16.75.242 103.1.106.69 2 u 1 64 377 19.543 42854.0 91.711
2017-12-21 11:27:12 +77.78.107.252 193.79.237.14 2 u 64 64 377 339.216 43001.7 179.162
2017-12-21 15:27:12 remote refid st t when poll reach delay offset jitter
2017-12-21 15:27:12 ==============================================================================
2017-12-21 15:27:12 +88.198.12.78 131.188.3.220 2 u 44 64 377 393.819 35847.8 67.966
2017-12-21 15:27:12 +62.168.65.36 10.0.0.1 4 u 51 64 337 401.860 36045.8 247.499
2017-12-21 15:27:12 *160.16.75.242 103.1.106.69 2 u 58 64 377 20.191 35969.4 80.117
2017-12-21 15:27:12 +77.78.107.252 193.79.237.14 2 u 60 64 377 293.774 36014.0 152.626
2017-12-21 19:27:12 remote refid st t when poll reach delay offset jitter
2017-12-21 19:27:12 ==============================================================================
2017-12-21 19:27:12 +88.198.12.78 192.53.103.108 2 u 1 64 177 406.766 29028.5 212.348
2017-12-21 19:27:12 +62.168.65.36 10.0.0.1 4 u 32 64 377 409.769 28954.1 171.501
2017-12-21 19:27:12 *160.16.75.242 103.1.106.69 2 u 17 64 377 18.957 28934.9 78.838
2017-12-21 19:27:12 +77.78.107.252 193.79.237.14 2 u 29 64 377 363.591 28820.2 95.755
2017-12-21 23:27:12 remote refid st t when poll reach delay offset jitter
2017-12-21 23:27:12 ==============================================================================
2017-12-21 23:27:12 +88.198.12.78 131.188.3.221 2 u 49 64 377 473.349 21821.2 79.942
2017-12-21 23:27:12 -62.168.65.36 10.0.0.1 4 u 35 64 277 479.798 21832.4 77.411
2017-12-21 23:27:12 *160.16.75.242 103.1.106.69 2 u 64 64 377 19.829 21882.8 146.781
2017-12-21 23:27:12 +77.78.107.252 193.79.237.14 2 u 19 64 377 330.402 22054.9 203.061
2017-12-22 03:27:12 remote refid st t when poll reach delay offset jitter
2017-12-22 03:27:12 ==============================================================================
2017-12-22 03:27:12 +88.198.12.78 131.188.3.221 2 u 35 64 377 458.565 14876.5 54.687
2017-12-22 03:27:12 -62.168.65.36 10.0.0.1 4 u 15 64 377 500.141 14913.4 87.029
2017-12-22 03:27:12 *160.16.75.242 103.1.106.69 2 u 64 64 377 21.428 14939.8 117.483
2017-12-22 03:27:12 +77.78.107.252 193.79.237.14 2 u 15 64 377 314.150 15046.0 150.638
2017-12-22 07:27:12 remote refid st t when poll reach delay offset jitter
2017-12-22 07:27:12 ==============================================================================
2017-12-22 07:27:12 +88.198.12.78 192.53.103.108 2 u 10 64 377 417.045 8068.63 187.511
2017-12-22 07:27:12 -62.168.65.36 10.0.0.1 4 u 14 64 377 417.965 7880.89 95.622
2017-12-22 07:27:12 *160.16.75.242 103.1.106.69 2 u 49 64 377 19.356 8112.88 113.098
2017-12-22 07:27:12 +77.78.107.252 193.79.237.14 2 u 4 64 377 299.745 7951.78 88.928
2017-12-22 11:27:12 remote refid st t when poll reach delay offset jitter
2017-12-22 11:27:12 ==============================================================================
2017-12-22 11:27:12 +88.198.12.78 192.53.103.108 2 u 12 64 377 393.500 911.438 83.464
2017-12-22 11:27:12 +62.168.65.36 10.0.0.1 4 u 13 64 377 368.658 928.835 88.341
2017-12-22 11:27:12 *160.16.75.242 103.1.106.69 2 u 20 64 377 19.737 931.036 148.066
2017-12-22 11:27:12 +77.78.107.252 193.79.237.14 2 u 32 64 377 293.024 1078.17 145.997
2017-12-22 15:27:12 remote refid st t when poll reach delay offset jitter
2017-12-22 15:27:12 ==============================================================================
2017-12-22 15:27:12 +88.198.12.78 192.53.103.108 2 u 116 64 366 350.150 -291.90 56.264
2017-12-22 15:27:12 -62.168.65.36 10.0.0.1 4 u 23 64 377 364.775 -287.10 66.848
2017-12-22 15:27:12 *160.16.75.242 103.1.106.69 2 u 63 64 377 17.308 -268.27 8.694
2017-12-22 15:27:12 +77.78.107.252 193.79.237.14 2 u 15 64 377 304.360 -284.94 48.563
2017-12-22 19:27:12 remote refid st t when poll reach delay offset jitter
2017-12-22 19:27:12 ==============================================================================
2017-12-22 19:27:12 +88.198.12.78 130.149.17.21 2 u 32 64 375 350.803 -105.18 35.724
2017-12-22 19:27:12 -62.168.65.36 10.0.0.1 4 u 28 64 355 397.018 -133.22 65.489
2017-12-22 19:27:12 *160.16.75.242 103.1.106.69 2 u 64 64 377 18.326 -77.383 2.308
2017-12-22 19:27:12 +77.78.107.252 193.79.237.14 2 u 32 64 377 274.139 -83.737 53.700
2017-12-22 23:27:12 remote refid st t when poll reach delay offset jitter
2017-12-22 23:27:12 ==============================================================================
2017-12-22 23:27:12 +88.198.12.78 129.69.1.170 2 u 20 64 377 406.888 -82.067 62.065
2017-12-22 23:27:12 -62.168.65.36 10.0.0.1 4 u 2 64 377 459.460 -96.257 39.912
2017-12-22 23:27:12 *160.16.75.242 103.1.106.69 2 u 63 64 377 19.970 -20.498 2.315
2017-12-22 23:27:12 +77.78.107.252 193.79.237.14 2 u 6 64 377 272.188 -31.527 50.493
2017-12-23 03:27:12 remote refid st t when poll reach delay offset jitter
2017-12-23 03:27:12 ==============================================================================
2017-12-23 03:27:12 +88.198.12.78 130.149.17.8 2 u 65 64 377 407.321 -59.207 58.910
2017-12-23 03:27:12 -62.168.65.36 10.0.0.1 4 u 33 64 377 440.553 -71.257 58.737
2017-12-23 03:27:12 *160.16.75.242 103.1.106.69 2 u 3 64 377 17.629 -5.087 2.468
2017-12-23 03:27:12 +77.78.107.252 193.79.237.14 2 u 3 64 377 262.537 -12.461 46.262
2017-12-23 07:27:12 remote refid st t when poll reach delay offset jitter
2017-12-23 07:27:12 ==============================================================================
2017-12-23 07:27:12 +88.198.12.78 192.53.103.108 2 u 14 128 377 353.793 -38.173 31.635
2017-12-23 07:27:12 -62.168.65.36 10.0.0.1 4 u 128 128 357 314.421 -6.258 65.600
2017-12-23 07:27:12 *160.16.75.242 103.1.106.69 2 u 56 128 377 20.802 -2.770 2.526
2017-12-23 07:27:12 +77.78.107.252 193.79.237.14 2 u 35 128 377 293.276 -21.234 44.357
2017-12-23 11:27:12 remote refid st t when poll reach delay offset jitter
2017-12-23 11:27:12 ==============================================================================
2017-12-23 11:27:12 +88.198.12.78 131.188.3.221 2 u 72 128 377 355.471 -32.193 52.514
2017-12-23 11:27:12 -62.168.65.36 10.0.0.1 4 u 35 128 377 322.267 -6.150 65.073
2017-12-23 11:27:12 *160.16.75.242 103.1.106.69 2 u 6 128 377 17.714 -0.544 21.378
2017-12-23 11:27:12 +77.78.107.252 193.79.237.14 2 u 89 128 377 273.443 -7.268 69.730
2017-12-23 15:27:12 remote refid st t when poll reach delay offset jitter
2017-12-23 15:27:12 ==============================================================================
2017-12-23 15:27:12 +88.198.12.78 130.149.17.21 2 u 218 128 376 398.335 -36.899 66.687
2017-12-23 15:27:12 -62.168.65.36 10.0.0.1 4 u 69 128 377 399.607 -50.116 52.741
2017-12-23 15:27:12 *160.16.75.242 103.1.106.69 2 u 54 128 377 18.504 3.443 2.251
2017-12-23 15:27:12 +77.78.107.252 193.79.237.14 2 u 130 128 377 286.565 -6.324 43.542
2017-12-23 19:27:12 remote refid st t when poll reach delay offset jitter
2017-12-23 19:27:12 ==============================================================================
2017-12-23 19:27:12 +88.198.12.78 192.53.103.108 2 u 3 128 377 420.145 -59.828 63.652
2017-12-23 19:27:12 -62.168.65.36 10.0.0.1 4 u 123 128 277 427.106 -55.130 69.321
2017-12-23 19:27:12 *160.16.75.242 103.1.106.69 2 u 25 128 377 18.303 5.238 2.064
2017-12-23 19:27:12 +77.78.107.252 193.79.237.14 2 u 103 128 377 266.104 -2.941 57.983
2017-12-23 23:27:12 remote refid st t when poll reach delay offset jitter
2017-12-23 23:27:12 ==============================================================================
2017-12-23 23:27:12 +88.198.12.78 192.53.103.108 2 u 72 128 377 450.629 -74.868 52.780
2017-12-23 23:27:12 -62.168.65.36 10.0.0.1 4 u 56 128 377 424.857 -52.707 45.454
2017-12-23 23:27:12 *160.16.75.242 103.1.106.69 2 u 53 128 377 18.711 0.328 5.487
2017-12-23 23:27:12 +77.78.107.252 193.79.237.14 2 u 100 128 377 279.764 -7.365 46.453
2017-12-24 03:27:12 remote refid st t when poll reach delay offset jitter
2017-12-24 03:27:12 ==============================================================================
2017-12-24 03:27:12 +88.198.12.78 192.53.103.108 2 u 1 128 367 403.737 -48.499 55.266
2017-12-24 03:27:12 -62.168.65.36 10.0.0.1 4 u 17 128 377 417.837 -53.391 69.070
2017-12-24 03:27:12 *160.16.75.242 103.1.106.69 2 u 10 128 377 19.883 3.392 1.573
2017-12-24 03:27:12 +77.78.107.252 193.79.237.14 2 u 73 128 377 315.090 -27.232 37.709
最後に、今現在の drift 値です。
[root@hoge ~]# ntpq -np
remote refid st t when poll reach delay offset jitter
==============================================================================
-178.33.126.120 213.251.128.249 2 u 128 128 377 286.983 61.092 46.824
+129.250.35.251 249.224.99.213 2 u 38 128 377 19.186 73.376 2.471
+45.76.221.157 103.1.106.69 2 u 95 128 377 21.958 76.460 1.490
*85.114.26.194 .DTS. 1 u 95 128 377 223.261 107.454 34.164
[root@hoge ~]# cat /var/lib/ntp/drift
-14.359
ThinkPad は、何台も利用してきましたが、今回のように maxpoll の調整が必要になったことはなかったのですが、やっぱり最新の高度化した省電力機能のせいではないか？という憶測を抱いています。それにしても、ThinkPad 25 のキーボード（バックライト光らせるとカッコイイ）は、なかなか快適です。CentOS 7.4 の動作もほとんど問題なし。どうにかして、Linux でも GeForce 940MX を活用できないのか？とは思うんですが、FireFox の動き（スクロール）もスムーズだし、ま、いいか。
[root@hoge ~]# dmidecode --type 1 # dmidecode 3.0 Getting SMBIOS data from sysfs. SMBIOS 3.0.0 present. Handle 0x000C, DMI type 1, 27 bytes System Information Manufacturer: LENOVO Product Name: 20K70003JP Version: ThinkPad 25 Serial Number: xxxxxxxx UUID: 307F584C-2BAE-11B2-A85C-C18B88313792 Wake-up Type: Power Switch SKU Number: LENOVO_MT_20K7_BU_Think_FM_ThinkPad 25 Family: ThinkPad 25 [root@hoge ~]# uversion CentOS Linux release 7.4.1708 20K70003JP BIOS version : N1QET63W (1.38 ) 08/22/2017 System serial : xxxxxxxx CPU model : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz Processors : 4 (1 sockets, 2 cores per CPU, Hyperthreading: enabled) Memory : 15649 MB Linux : 3.10.0-693.11.6.el7.x86_64 x86_64 (hoge) [root@hoge ~]# lspci 00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02) 00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02) 00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21) 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21) 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21) 00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21) 00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) 00:1c.6 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #7 (rev f1) 00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 (rev f1) 00:1d.2 PCI bridge: Intel Corporation Device 9d1a (rev f1) 00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21) 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21) 00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21) 00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21) 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (4) I219-V (rev 21) 02:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2) 04:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78) 3e:00.0 Non-Volatile memory controller: Lenovo Device 00042018-04-08追記
ひさびさに drift 値を確認してみました。
[root@hoge ~]# cat /var/lib/ntp/drift 15.581前に確認したときの値が、-14.359 だったのですが、今回は +15.581 と結構ブレていますね。仕事上、新旧いろいろなマシンを触ってますが、こんなにブレるマシンは見たことなかったです。
