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 _______________________________________________ pool mailing list pool@lists.ntp.org http://lists.ntp.org/listinfo/pool
