[Pool] DNS queries per second

Ask Bjørn Hansen ask at perl.org
Tue Mar 22 23:59:06 UTC 2011


Hi,

I don't have any ideas for how to avoid this; but basically a crazy amount of the SNTP clients sync just at the top of the hour; or close to it. 

Below is a second by second query count on one of the busier DNS servers for pool.ntp.org.   The normal load is as it is just before the top of the hour and it drops most of the way back to that after a few minutes (and all the way after ~15 minutes it looks like).


  - ask

2011-03-22 22:59:47 110
2011-03-22 22:59:48 125
2011-03-22 22:59:49 123
2011-03-22 22:59:50 129
2011-03-22 22:59:51 115
2011-03-22 22:59:52 121
2011-03-22 22:59:53 124
2011-03-22 22:59:54 119
2011-03-22 22:59:55 118
2011-03-22 22:59:56 168
2011-03-22 22:59:57 168
2011-03-22 22:59:58 185
2011-03-22 22:59:59 259
2011-03-22 23:00:00 527
2011-03-22 23:00:01 500
2011-03-22 23:00:02 505
2011-03-22 23:00:03 530
2011-03-22 23:00:04 548
2011-03-22 23:00:05 553
2011-03-22 23:00:06 576
2011-03-22 23:00:07 577
2011-03-22 23:00:08 577
2011-03-22 23:00:09 582
2011-03-22 23:00:10 574
2011-03-22 23:00:11 560
2011-03-22 23:00:12 566
2011-03-22 23:00:13 489
2011-03-22 23:00:14 552
2011-03-22 23:00:15 577
2011-03-22 23:00:16 579
2011-03-22 23:00:17 560
2011-03-22 23:00:18 554
2011-03-22 23:00:19 549
2011-03-22 23:00:20 556
2011-03-22 23:00:21 555
2011-03-22 23:00:22 541
2011-03-22 23:00:23 567
2011-03-22 23:00:24 569
2011-03-22 23:00:25 561
2011-03-22 23:00:26 550
2011-03-22 23:00:27 552
2011-03-22 23:00:28 565
2011-03-22 23:00:29 555
2011-03-22 23:00:30 546
2011-03-22 23:00:31 543
2011-03-22 23:00:32 557
2011-03-22 23:00:33 559
2011-03-22 23:00:34 552
2011-03-22 23:00:35 546
2011-03-22 23:00:36 540
2011-03-22 23:00:37 534
2011-03-22 23:00:38 554
2011-03-22 23:00:39 540
2011-03-22 23:00:40 540
2011-03-22 23:00:41 548
2011-03-22 23:00:42 547
2011-03-22 23:00:43 542
2011-03-22 23:00:44 553
2011-03-22 23:00:45 543
2011-03-22 23:00:46 550
2011-03-22 23:00:47 536
2011-03-22 23:00:48 551
2011-03-22 23:00:49 538
2011-03-22 23:00:50 551
2011-03-22 23:00:51 548
2011-03-22 23:00:52 541
2011-03-22 23:00:53 561
2011-03-22 23:00:54 554
2011-03-22 23:00:55 526
2011-03-22 23:00:56 392
2011-03-22 23:00:57 386
2011-03-22 23:00:58 315
2011-03-22 23:00:59 267
2011-03-22 23:01:00 461
2011-03-22 23:01:01 575
2011-03-22 23:01:02 554
2011-03-22 23:01:03 549
2011-03-22 23:01:04 562
2011-03-22 23:01:05 490
2011-03-22 23:01:06 409
2011-03-22 23:01:07 315
2011-03-22 23:01:08 288



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