[root@hoge ~]# cat /usr/lib/systemd/system/fstrim.timer [Unit] Description=Discard unused blocks once a week Documentation=man:fstrim [Timer] OnCalendar=weekly AccuracySec=1h Persistent=true [Install] WantedBy=multi-user.targetこれを systemctl enable fstrim.timer すればよいです。なるほど、systemd には cron ちっくな機能も盛り込まれてるのですね。
2018年3月14日水曜日
SSD に対する定期的な fstrim 実行
CentOS 7 で、SSD の性能維持のため、定期的に fstrim を実行したいと思い、安直に cron を書きそうでしたが、その前に調べて見たところ、systemd が予め用意してくれているサービスがあることを知りました。
2018年3月10日土曜日
双子素数の探査
双子素数に興味を持ち、ちょっと一筆。遅いですが手っ取り早くbash+factorコマンドで書いてみました。
#!/bin/bash
LANG=C
declare -i n
declare -i m
declare -a a
declare -a b
for ((n=1001;n<10000;n+=2))
do
a=(`factor $n`)
if [ ${a[1]} = $n ] ; then
let m=n+2
b=(`factor $m`)
if [ ${b[1]} = $m ] ; then
echo $n $m
fi
fi
done
4桁の双子素数を表示します。以下、実行結果です。170組もあるとは思いませんでした。意外と多かった。
[root@hoge ~]# time ./twinprimes 1019 1021 1031 1033 1049 1051 1061 1063 1091 1093 1151 1153 1229 1231 1277 1279 1289 1291 1301 1303 1319 1321 1427 1429 1451 1453 1481 1483 1487 1489 1607 1609 1619 1621 1667 1669 1697 1699 1721 1723 1787 1789 1871 1873 1877 1879 1931 1933 1949 1951 1997 1999 2027 2029 2081 2083 2087 2089 2111 2113 2129 2131 2141 2143 2237 2239 2267 2269 2309 2311 2339 2341 2381 2383 2549 2551 2591 2593 2657 2659 2687 2689 2711 2713 2729 2731 2789 2791 2801 2803 2969 2971 2999 3001 3119 3121 3167 3169 3251 3253 3257 3259 3299 3301 3329 3331 3359 3361 3371 3373 3389 3391 3461 3463 3467 3469 3527 3529 3539 3541 3557 3559 3581 3583 3671 3673 3767 3769 3821 3823 3851 3853 3917 3919 3929 3931 4001 4003 4019 4021 4049 4051 4091 4093 4127 4129 4157 4159 4217 4219 4229 4231 4241 4243 4259 4261 4271 4273 4337 4339 4421 4423 4481 4483 4517 4519 4547 4549 4637 4639 4649 4651 4721 4723 4787 4789 4799 4801 4931 4933 4967 4969 5009 5011 5021 5023 5099 5101 5231 5233 5279 5281 5417 5419 5441 5443 5477 5479 5501 5503 5519 5521 5639 5641 5651 5653 5657 5659 5741 5743 5849 5851 5867 5869 5879 5881 6089 6091 6131 6133 6197 6199 6269 6271 6299 6301 6359 6361 6449 6451 6551 6553 6569 6571 6659 6661 6689 6691 6701 6703 6761 6763 6779 6781 6791 6793 6827 6829 6869 6871 6947 6949 6959 6961 7127 7129 7211 7213 7307 7309 7331 7333 7349 7351 7457 7459 7487 7489 7547 7549 7559 7561 7589 7591 7757 7759 7877 7879 7949 7951 8009 8011 8087 8089 8219 8221 8231 8233 8291 8293 8387 8389 8429 8431 8537 8539 8597 8599 8627 8629 8819 8821 8837 8839 8861 8863 8969 8971 8999 9001 9011 9013 9041 9043 9239 9241 9281 9283 9341 9343 9419 9421 9431 9433 9437 9439 9461 9463 9629 9631 9677 9679 9719 9721 9767 9769 9857 9859 9929 9931 real 0m4.132s user 0m2.390s sys 0m1.903s [root@hoge ~]# ./twinprimes | wc -l 170
2018年1月26日金曜日
ntpd で時刻補正がうまく行かない場合の対症療法
新しく ThinkPad 25 で、CentOS 7 を使い始めたのですが、ntpd での時刻補正がうまくいかず、時刻がどんどんずれていく状態でした。
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。
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。
ひさびさに drift 値を確認してみました。
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。
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