Time problems with embedded Linux system (offset does not stabilize)
Hans Jørgen Jakobsen
The servers are on the same LAN or near that.
(ie its not a congested line or router)
When the machine is booted (and tickadj applied) the offset is growing aprox. 4 ms /minute.
(ie the oscilator is stable)
Ntp has been running for days and the value in the driftfile is getting stable.
But when dong ntpdate is shows an offset that is blowing in the wind.
The offset is drifting +/- 50 ms and that is continuing after ntpd is killed!
For me is looks like there is a problem with the code in the kernel that do the adjustments to the time.
Is this a known problem?
/hjj
Only details below
The system is an embedded system with an AMD sc520 processor(486++)
Boot is from 8M flash to 32Mram.
Kernel is 2.2.15
ntpd is ntp-4.1.0b-rc3 and its compiled on a 2.2.14-5.0 box.
(The symptoms has been seen with older versions too)
snip of "ntpdate -dv |grep adjust" after a reboot and tickadj 10033 applied:
17 Jan 12:26:55 ntpdate[480]: adjust time server 193.162.159.194 offset 0.004808 sec
17 Jan 12:27:25 ntpdate[483]: adjust time server 193.162.159.194 offset 0.006901 sec
17 Jan 12:27:55 ntpdate[486]: adjust time server 193.162.159.194 offset 0.008953 sec
17 Jan 12:28:26 ntpdate[489]: adjust time server 193.162.159.194 offset 0.011086 sec
17 Jan 12:28:56 ntpdate[492]: adjust time server 193.162.159.194 offset 0.013168 sec
17 Jan 12:29:26 ntpdate[495]: adjust time server 193.162.159.194 offset 0.015277 sec
17 Jan 12:29:56 ntpdate[498]: adjust time server 193.162.159.194 offset 0.017328 sec
17 Jan 12:30:27 ntpdate[501]: adjust time server 193.162.159.194 offset 0.019416 sec
17 Jan 12:30:57 ntpdate[504]: adjust time server 193.162.159.194 offset 0.021490 sec
17 Jan 12:31:27 ntpdate[507]: adjust time server 193.162.159.194 offset 0.023595 sec
17 Jan 12:31:58 ntpdate[510]: adjust time server 193.162.159.194 offset 0.025679 sec
difference is aprox 2 ms and difference of differences is less than +-50 microsec.
Here is the same output after ntpd has just been killed:
(Yes I am shure it has been killed)
17 Jan 09:55:19 ntpdate[1485]: adjust time server 193.162.159.194 offset -0.011941 sec
17 Jan 09:55:49 ntpdate[1488]: adjust time server 193.162.159.194 offset -0.014150 sec
17 Jan 09:56:20 ntpdate[1491]: adjust time server 193.162.159.194 offset -0.016348 sec
17 Jan 09:56:50 ntpdate[1494]: adjust time server 193.162.159.194 offset -0.018567 sec
17 Jan 09:57:20 ntpdate[1497]: adjust time server 193.162.159.194 offset -0.020797 sec
17 Jan 09:57:51 ntpdate[1500]: adjust time server 193.162.159.194 offset -0.022999 sec
17 Jan 09:58:21 ntpdate[1503]: adjust time server 193.162.159.194 offset -0.025177 sec
17 Jan 09:58:51 ntpdate[1506]: adjust time server 193.162.159.194 offset -0.027372 sec
17 Jan 09:59:21 ntpdate[1509]: adjust time server 193.162.159.194 offset -0.029577 sec
17 Jan 09:59:52 ntpdate[1512]: adjust time server 193.162.159.194 offset -0.031778 sec
17 Jan 10:00:22 ntpdate[1515]: adjust time server 193.162.159.194 offset -0.003860 sec
17 Jan 10:00:52 ntpdate[1518]: adjust time server 193.162.159.194 offset -0.006057 sec
17 Jan 10:01:23 ntpdate[1521]: adjust time server 193.162.159.194 offset 0.021836 sec
17 Jan 10:01:53 ntpdate[1524]: adjust time server 193.162.159.194 offset 0.019642 sec
17 Jan 10:02:23 ntpdate[1527]: adjust time server 193.162.159.194 offset 0.047553 sec
17 Jan 10:02:54 ntpdate[1530]: adjust time server 193.162.159.194 offset 0.045353 sec
17 Jan 10:03:24 ntpdate[1533]: adjust time server 193.162.159.194 offset 0.073244 sec
17 Jan 10:03:54 ntpdate[1536]: adjust time server 193.162.159.194 offset 0.071048 sec
17 Jan 10:04:25 ntpdate[1539]: adjust time server 193.162.159.194 offset 0.068892 sec
17 Jan 10:04:55 ntpdate[1543]: adjust time server 193.162.159.194 offset 0.066687 sec
17 Jan 10:05:25 ntpdate[1547]: adjust time server 193.162.159.194 offset 0.064481 sec
17 Jan 10:05:56 ntpdate[1550]: adjust time server 193.162.159.194 offset 0.062286 sec
17 Jan 10:06:26 ntpdate[1553]: adjust time server 193.162.159.194 offset 0.060084 sec
17 Jan 10:06:56 ntpdate[1556]: adjust time server 193.162.159.194 offset 0.057901 sec
17 Jan 10:07:27 ntpdate[1559]: adjust time server 193.162.159.194 offset 0.055731 sec
17 Jan 10:07:57 ntpdate[1562]: adjust time server 193.162.159.194 offset 0.053546 sec
17 Jan 10:08:27 ntpdate[1565]: adjust time server 193.162.159.194 offset 0.051369 sec
17 Jan 10:08:57 ntpdate[1568]: adjust time server 193.162.159.194 offset 0.049158 sec
17 Jan 10:09:28 ntpdate[1571]: adjust time server 193.162.159.194 offset 0.047008 sec
17 Jan 10:09:58 ntpdate[1574]: adjust time server 193.162.159.194 offset 0.044810 sec
17 Jan 10:10:28 ntpdate[1577]: adjust time server 193.162.159.194 offset 0.042621 sec
17 Jan 10:10:59 ntpdate[1580]: adjust time server 193.162.159.194 offset 0.040447 sec
17 Jan 10:11:29 ntpdate[1583]: adjust time server 193.162.159.194 offset 0.038287 sec
17 Jan 10:11:59 ntpdate[1586]: adjust time server 193.162.159.194 offset 0.036107 sec
17 Jan 10:12:30 ntpdate[1589]: adjust time server 193.162.159.194 offset 0.033942 sec
17 Jan 10:13:00 ntpdate[1592]: adjust time server 193.162.159.194 offset 0.031764 sec
17 Jan 10:13:30 ntpdate[1595]: adjust time server 193.162.159.194 offset 0.029600 sec
17 Jan 10:14:01 ntpdate[1598]: adjust time server 193.162.159.194 offset 0.027398 sec
17 Jan 10:14:31 ntpdate[1601]: adjust time server 193.162.159.194 offset 0.025237 sec
17 Jan 10:15:01 ntpdate[1604]: adjust time server 193.162.159.194 offset 0.023055 sec
17 Jan 10:15:32 ntpdate[1607]: adjust time server 193.162.159.194 offset 0.020903 sec
17 Jan 10:16:02 ntpdate[1610]: adjust time server 193.162.159.194 offset 0.018737 sec
17 Jan 10:16:32 ntpdate[1613]: adjust time server 193.162.159.194 offset 0.016577 sec
17 Jan 10:17:03 ntpdate[1616]: adjust time server 193.162.159.194 offset 0.014421 sec
17 Jan 10:17:33 ntpdate[1619]: adjust time server 193.162.159.194 offset 0.012255 sec
17 Jan 10:18:03 ntpdate[1622]: adjust time server 193.162.159.194 offset 0.010085 sec
17 Jan 10:18:33 ntpdate[1625]: adjust time server 193.162.159.194 offset 0.007912 sec
17 Jan 10:19:04 ntpdate[1628]: adjust time server 193.162.159.194 offset 0.005746 sec
17 Jan 10:19:34 ntpdate[1631]: adjust time server 193.162.159.194 offset 0.003588 sec
17 Jan 10:20:04 ntpdate[1634]: adjust time server 193.162.159.194 offset 0.001416 sec
17 Jan 10:20:35 ntpdate[1637]: adjust time server 193.162.159.194 offset -0.000721 sec
17 Jan 10:21:05 ntpdate[1640]: adjust time server 193.162.159.194 offset -0.002881 sec
17 Jan 10:21:35 ntpdate[1643]: adjust time server 193.162.159.194 offset -0.005026 sec
17 Jan 10:22:06 ntpdate[1646]: adjust time server 193.162.159.194 offset -0.007183 sec
17 Jan 10:22:36 ntpdate[1649]: adjust time server 193.162.159.194 offset -0.009322 sec
17 Jan 10:23:06 ntpdate[1652]: adjust time server 193.162.159.194 offset -0.011506 sec
17 Jan 10:23:37 ntpdate[1655]: adjust time server 193.162.159.194 offset -0.013651 sec
17 Jan 10:24:07 ntpdate[1658]: adjust time server 193.162.159.194 offset -0.015809 sec
17 Jan 10:24:37 ntpdate[1661]: adjust time server 193.162.159.194 offset -0.017947 sec
17 Jan 10:25:08 ntpdate[1664]: adjust time server 193.162.159.194 offset -0.020107 sec
17 Jan 10:25:38 ntpdate[1667]: adjust time server 193.162.159.194 offset -0.022247 sec
17 Jan 10:26:08 ntpdate[1670]: adjust time server 193.162.159.194 offset -0.024380 sec
17 Jan 10:26:38 ntpdate[1674]: adjust time server 193.162.159.194 offset -0.026524 sec
17 Jan 10:27:09 ntpdate[1677]: adjust time server 193.162.159.194 offset -0.028673 sec
17 Jan 10:27:39 ntpdate[1680]: adjust time server 193.162.159.194 offset -0.030804 sec
17 Jan 10:28:09 ntpdate[1683]: adjust time server 193.162.159.194 offset -0.032962 sec
17 Jan 10:28:40 ntpdate[1686]: adjust time server 193.162.159.194 offset -0.035084 sec
17 Jan 10:29:10 ntpdate[1689]: adjust time server 193.162.159.194 offset -0.037240 sec
17 Jan 10:29:40 ntpdate[1692]: adjust time server 193.162.159.194 offset -0.039353 sec
17 Jan 10:30:11 ntpdate[1695]: adjust time server 193.162.159.194 offset -0.041513 sec
17 Jan 10:30:41 ntpdate[1698]: adjust time server 193.162.159.194 offset -0.043635 sec
17 Jan 10:31:11 ntpdate[1701]: adjust time server 193.162.159.194 offset -0.045776 sec
17 Jan 10:31:42 ntpdate[1704]: adjust time server 193.162.159.194 offset -0.047902 sec
17 Jan 10:32:12 ntpdate[1707]: adjust time server 193.162.159.194 offset -0.050052 sec
17 Jan 10:32:42 ntpdate[1710]: adjust time server 193.162.159.194 offset -0.052160 sec
17 Jan 10:33:13 ntpdate[1713]: adjust time server 193.162.159.194 offset -0.054314 sec
17 Jan 10:33:43 ntpdate[1716]: adjust time server 193.162.159.194 offset -0.056448 sec
17 Jan 10:34:13 ntpdate[1719]: adjust time server 193.162.159.194 offset -0.058598 sec
17 Jan 10:34:44 ntpdate[1722]: adjust time server 193.162.159.194 offset -0.060718 sec
17 Jan 10:35:14 ntpdate[1726]: adjust time server 193.162.159.194 offset -0.062858 sec
17 Jan 10:35:44 ntpdate[1729]: adjust time server 193.162.159.194 offset -0.064970 sec
17 Jan 10:36:14 ntpdate[1732]: adjust time server 193.162.159.194 offset -0.067114 sec
17 Jan 10:36:45 ntpdate[1735]: adjust time server 193.162.159.194 offset -0.069230 sec
17 Jan 10:37:15 ntpdate[1738]: adjust time server 193.162.159.194 offset -0.071361 sec
17 Jan 10:37:45 ntpdate[1741]: adjust time server 193.162.159.194 offset -0.043386 sec
17 Jan 10:38:16 ntpdate[1744]: adjust time server 193.162.159.194 offset -0.045504 sec
17 Jan 10:38:46 ntpdate[1747]: adjust time server 193.162.159.194 offset -0.017526 sec
17 Jan 10:39:16 ntpdate[1750]: adjust time server 193.162.159.194 offset -0.019653 sec
17 Jan 10:39:47 ntpdate[1753]: adjust time server 193.162.159.194 offset 0.008326 sec
17 Jan 10:40:17 ntpdate[1756]: adjust time server 193.162.159.194 offset 0.006173 sec
17 Jan 10:40:47 ntpdate[1759]: adjust time server 193.162.159.194 offset 0.034163 sec
17 Jan 10:41:18 ntpdate[1762]: adjust time server 193.162.159.194 offset 0.032028 sec
17 Jan 10:41:48 ntpdate[1765]: adjust time server 193.162.159.194 offset 0.029926 sec
17 Jan 10:42:18 ntpdate[1768]: adjust time server 193.162.159.194 offset 0.027785 sec
17 Jan 10:42:49 ntpdate[1771]: adjust time server 193.162.159.194 offset 0.025659 sec
17 Jan 10:43:19 ntpdate[1774]: adjust time server 193.162.159.194 offset 0.023506 sec
17 Jan 10:43:49 ntpdate[1777]: adjust time server 193.162.159.194 offset 0.021400 sec
17 Jan 10:44:19 ntpdate[1780]: adjust time server 193.162.159.194 offset 0.019268 sec
17 Jan 10:44:50 ntpdate[1783]: adjust time server 193.162.159.194 offset 0.017161 sec
17 Jan 10:45:20 ntpdate[1786]: adjust time server 193.162.159.194 offset 0.015038 sec
17 Jan 10:45:50 ntpdate[1789]: adjust time server 193.162.159.194 offset 0.012933 sec
17 Jan 10:46:21 ntpdate[1792]: adjust time server 193.162.159.194 offset 0.010817 sec
17 Jan 10:46:51 ntpdate[1795]: adjust time server 193.162.159.194 offset 0.008714 sec
17 Jan 10:47:21 ntpdate[1798]: adjust time server 193.162.159.194 offset 0.006589 sec
17 Jan 10:47:52 ntpdate[1801]: adjust time server 193.162.159.194 offset 0.004504 sec
17 Jan 10:48:22 ntpdate[1804]: adjust time server 193.162.159.194 offset 0.002339 sec
17 Jan 10:48:52 ntpdate[1807]: adjust time server 193.162.159.194 offset 0.000250 sec
17 Jan 10:49:23 ntpdate[1810]: adjust time server 193.162.159.194 offset -0.001871 sec
17 Jan 10:49:53 ntpdate[1813]: adjust time server 193.162.159.194 offset -0.003969 sec
17 Jan 10:50:23 ntpdate[1816]: adjust time server 193.162.159.194 offset -0.006094 sec
17 Jan 10:50:54 ntpdate[1819]: adjust time server 193.162.159.194 offset -0.008152 sec
17 Jan 10:51:24 ntpdate[1822]: adjust time server 193.162.159.194 offset -0.010298 sec
17 Jan 10:51:54 ntpdate[1825]: adjust time server 193.162.159.194 offset -0.012389 sec
17 Jan 10:52:25 ntpdate[1828]: adjust time server 193.162.159.194 offset -0.014506 sec
17 Jan 10:52:55 ntpdate[1831]: adjust time server 193.162.159.194 offset -0.016594 sec
17 Jan 10:53:25 ntpdate[1834]: adjust time server 193.162.159.194 offset -0.018716 sec
17 Jan 10:53:55 ntpdate[1837]: adjust time server 193.162.159.194 offset -0.020807 sec
17 Jan 10:54:26 ntpdate[1840]: adjust time server 193.162.159.194 offset -0.022912 sec
17 Jan 10:54:56 ntpdate[1843]: adjust time server 193.162.159.194 offset -0.025004 sec
17 Jan 10:55:26 ntpdate[1846]: adjust time server 193.162.159.194 offset -0.027117 sec
17 Jan 10:55:57 ntpdate[1849]: adjust time server 193.162.159.194 offset -0.029214 sec
17 Jan 10:56:27 ntpdate[1852]: adjust time server 193.162.159.194 offset -0.031324 sec
17 Jan 10:56:57 ntpdate[1855]: adjust time server 193.162.159.194 offset -0.033452 sec
17 Jan 10:57:28 ntpdate[1858]: adjust time server 193.162.159.194 offset -0.035518 sec
17 Jan 10:57:58 ntpdate[1861]: adjust time server 193.162.159.194 offset -0.037607 sec
17 Jan 10:58:28 ntpdate[1864]: adjust time server 193.162.159.194 offset -0.039708 sec
17 Jan 10:58:59 ntpdate[1867]: adjust time server 193.162.159.194 offset -0.041798 sec
17 Jan 10:59:29 ntpdate[1870]: adjust time server 193.162.159.194 offset -0.043901 sec
17 Jan 10:59:59 ntpdate[1873]: adjust time server 193.162.159.194 offset -0.045999 sec
17 Jan 11:00:30 ntpdate[1876]: adjust time server 193.162.159.194 offset -0.048125 sec
17 Jan 11:01:00 ntpdate[1879]: adjust time server 193.162.159.194 offset -0.050183 sec
17 Jan 11:01:30 ntpdate[1882]: adjust time server 193.162.159.194 offset -0.052275 sec
17 Jan 11:02:01 ntpdate[1885]: adjust time server 193.162.159.194 offset -0.054360 sec
17 Jan 11:02:31 ntpdate[1888]: adjust time server 193.162.159.194 offset -0.056475 sec
17 Jan 11:03:01 ntpdate[1891]: adjust time server 193.162.159.194 offset -0.058553 sec
17 Jan 11:03:31 ntpdate[1894]: adjust time server 193.162.159.194 offset -0.060660 sec
17 Jan 11:04:02 ntpdate[1897]: adjust time server 193.162.159.194 offset -0.032626 sec
17 Jan 11:04:32 ntpdate[1900]: adjust time server 193.162.159.194 offset -0.034739 sec
17 Jan 11:05:02 ntpdate[1903]: adjust time server 193.162.159.194 offset -0.006717 sec
17 Jan 11:05:33 ntpdate[1906]: adjust time server 193.162.159.194 offset -0.008813 sec
17 Jan 11:06:03 ntpdate[1909]: adjust time server 193.162.159.194 offset 0.019200 sec
17 Jan 11:06:33 ntpdate[1912]: adjust time server 193.162.159.194 offset 0.017101 sec
17 Jan 11:07:04 ntpdate[1915]: adjust time server 193.162.159.194 offset 0.045135 sec
17 Jan 11:07:34 ntpdate[1918]: adjust time server 193.162.159.194 offset 0.043027 sec
17 Jan 11:08:04 ntpdate[1921]: adjust time server 193.162.159.194 offset 0.040965 sec
17 Jan 11:08:35 ntpdate[1924]: adjust time server 193.162.159.194 offset 0.038873 sec
17 Jan 11:09:05 ntpdate[1927]: adjust time server 193.162.159.194 offset 0.036757 sec
17 Jan 11:09:35 ntpdate[1930]: adjust time server 193.162.159.194 offset 0.034668 sec
17 Jan 11:10:06 ntpdate[1933]: adjust time server 193.162.159.194 offset 0.032592 sec
17 Jan 11:10:36 ntpdate[1936]: adjust time server 193.162.159.194 offset 0.030487 sec
17 Jan 11:11:06 ntpdate[1939]: adjust time server 193.162.159.194 offset 0.028392 sec
17 Jan 11:11:36 ntpdate[1942]: adjust time server 193.162.159.194 offset 0.026324 sec
17 Jan 11:12:07 ntpdate[1945]: adjust time server 193.162.159.194 offset 0.024260 sec
17 Jan 11:12:37 ntpdate[1948]: adjust time server 193.162.159.194 offset 0.022133 sec
17 Jan 11:13:07 ntpdate[1951]: adjust time server 193.162.159.194 offset 0.020069 sec
17 Jan 11:13:38 ntpdate[1954]: adjust time server 193.162.159.194 offset 0.017969 sec
17 Jan 11:14:08 ntpdate[1957]: adjust time server 193.162.159.194 offset 0.015887 sec
17 Jan 11:14:38 ntpdate[1960]: adjust time server 193.162.159.194 offset 0.013767 sec
17 Jan 11:15:09 ntpdate[1963]: adjust time server 193.162.159.194 offset 0.011734 sec
17 Jan 11:15:39 ntpdate[1966]: adjust time server 193.162.159.194 offset 0.009643 sec
17 Jan 11:16:09 ntpdate[1969]: adjust time server 193.162.159.194 offset 0.007587 sec
17 Jan 11:16:40 ntpdate[1972]: adjust time server 193.162.159.194 offset 0.005456 sec
17 Jan 11:17:10 ntpdate[1975]: adjust time server 193.162.159.194 offset 0.003374 sec
17 Jan 11:17:40 ntpdate[1978]: adjust time server 193.162.159.194 offset 0.001260 sec
17 Jan 11:18:11 ntpdate[1981]: adjust time server 193.162.159.194 offset -0.000794 sec
17 Jan 11:18:41 ntpdate[1984]: adjust time server 193.162.159.194 offset -0.002887 sec
Not very pretty.
root@qq6# cat loops
52291 48497.152 -0.012136500 98.091019 0.002082004 18.889991 4
52291 48561.361 -0.008825651 97.552322 0.004248241 16.361429 6
52291 48625.576 -0.006301877 97.167679 0.003679965 14.170718 6
52291 48689.793 -0.006447592 96.774124 0.003194995 12.273780 6
52291 48753.005 -0.006943353 96.350357 0.002778958 10.631516 6
52291 48817.221 -0.007045925 95.920303 0.002409355 9.209674 6
52291 48881.437 -0.007098663 95.487015 0.002092195 7.978753 7
52291 48945.652 -0.007321241 95.375305 0.001830146 6.910029 7
52291 49203.522 0.109760896 102.126923 0.038530731 6.870768 7
52291 49330.978 0.086510765 104.746399 0.037122009 6.092701 7
52291 49458.430 0.064334624 106.709747 0.034398867 5.366977 7
52291 49588.887 0.042689861 108.032898 0.031429040 4.694786 7
52291 49718.336 0.026863982 108.865524 0.028314232 4.087062 7
52291 49847.782 0.014941244 109.325043 0.025235953 3.546949 7
52291 49977.225 0.005830177 109.505737 0.022332623 3.073076 8
52291 50106.666 -0.001141934 109.496964 0.019659507 2.661366 8
52291 50362.536 -0.011729571 109.317978 0.017762201 2.306547 8
52291 50621.412 0.018612248 109.605301 0.031994819 2.002688 8
52291 50878.289 0.056500662 110.470795 0.028830169 1.787551 9
52291 51137.182 0.035012602 110.605911 0.027665832 1.549538 9
52291 51650.936 0.004776499 110.642410 0.028042283 1.342063 9
52291 52166.690 -0.017554363 110.507446 0.026784029 1.164218 9
52291 52679.429 -0.036312418 110.229874 0.024876766 1.017750 10
52291 53132.963 -0.036380926 110.168488 0.023221117 0.881932 10
52291 53146.009 0.004779986 110.168732 0.078845479 0.763775 10
52291 54162.463 0.044143318 110.335800 0.073198214 0.666703 10
52291 55190.968 0.060989733 110.569366 0.079597392 0.589073 10
root@qq6# cat peers
52291 48305.495 193.162.145.130 9014 0.000574000 0.001058000 7.937502384 0.000003815
52291 48307.501 193.162.159.194 9014 0.000491000 0.000606000 7.937502384 0.000003815
52291 48308.507 195.249.0.39 9014 0.000438214 0.002581781 7.937503815 0.000003815
52291 48370.718 193.162.145.130 9014 -0.003774500 0.001117000 3.937747326 0.004348500
52291 48371.721 193.162.159.194 9014 -0.003547500 0.001067000 3.937743576 0.004038500
52291 48373.729 195.249.0.39 9014 -0.004067617 0.002226141 3.937749472 0.004505831
52291 48433.934 193.162.145.130 9014 -0.007972500 0.001081000 1.937980422 0.004198000
52291 48437.948 193.162.159.194 9014 -0.008189500 0.000577000 1.937995422 0.004642000
52291 48438.953 195.249.0.39 9014 -0.008373546 0.002095561 1.937994176 0.004305929
52291 48497.154 193.162.145.130 9614 -0.012136500 0.000999000 0.938156033 0.004164000
52291 48501.164 193.162.159.194 9414 -0.011650500 0.000703000 0.938163533 0.003461000
52291 48505.178 195.249.0.39 9414 -0.011216085 0.002075541 0.938184028 0.002842539
52291 48561.362 193.162.145.130 9614 -0.006358500 0.001121000 0.438280401 0.005778000
52291 48564.370 193.162.159.194 9414 -0.006342500 0.000583000 0.438277119 0.005308000
52291 48569.389 195.249.0.39 9414 -0.006396056 0.002112081 0.438295828 0.004820028
52291 48625.577 193.162.145.130 9614 -0.006244500 0.001011000 0.188357584 0.000114000
52291 48630.593 193.162.159.194 9414 -0.006189500 0.000509000 0.188370475 0.000153000
52291 48632.601 195.249.0.39 9414 -0.006344914 0.002022180 0.188359463 0.000051143
52291 48689.793 193.162.145.130 9614 -0.006571500 0.001173000 0.063403676 0.000327000
52291 48694.809 193.162.159.194 9414 -0.006624500 0.000527000 0.063410122 0.000435000
52291 48696.817 195.249.0.39 9414 -0.006674647 0.002223680 0.063406046 0.000329733
52291 48753.006 193.162.145.130 9614 -0.006973000 0.000954000 0.000923031 0.000401500
52291 48761.031 193.162.159.194 9414 -0.006964500 0.000579000 0.000948578 0.000340000
52291 48763.040 195.249.0.39 9414 -0.006954505 0.002514481 0.000947971 0.000279858
52291 48817.221 193.162.145.130 9614 -0.007153000 0.000972000 0.000927074 0.000180000
52291 48826.251 193.162.159.194 9414 -0.007147000 0.000594000 0.000947113 0.000182500
52291 48827.255 195.249.0.39 9414 -0.007241374 0.002046820 0.000940764 0.000286869
52291 48881.438 193.162.145.130 9614 -0.006941500 0.001735000 0.000929125 0.000211500
52291 48890.468 195.249.0.39 9414 -0.007384822 0.002056140 0.000929748 0.000143448
52291 48891.470 193.162.159.194 9414 -0.007181000 0.000814000 0.000946351 0.000034000
52291 48945.653 193.162.145.130 9614 -0.007409500 0.000959000 0.000930121 0.000468000
52291 49019.904 195.249.0.39 9114 0.051797147 0.002176681 0.001415432 0.059181969
52291 49021.909 193.162.159.194 9414 0.051822000 0.000574000 0.001429691 0.059003000
52291 49073.082 193.162.145.130 9614 0.051076000 0.001004000 0.001399398 0.058485500
52291 49150.342 193.162.159.194 9414 0.110023000 0.000554000 0.001654515 0.058201000
52291 49150.344 195.249.0.39 9414 0.110205313 0.002743400 0.001663869 0.058408166
52291 49203.523 193.162.145.130 9614 0.109080000 0.001058000 0.001654515 0.058004000
52291 49277.788 193.162.159.194 9414 0.092009500 0.000589000 0.001757582 0.018013500
52291 49279.143 195.249.0.39 9414 0.071087830 0.352192661 0.001778771 0.039117483
52291 49330.979 193.162.145.130 9614 0.080960000 0.001280000 0.001757816 0.028120000
52291 49406.246 195.249.0.39 9414 0.066361902 0.002176381 0.001819377 0.004725928
52291 49407.248 193.162.159.194 9414 0.066300000 0.000686000 0.001822211 0.025709500
52291 49458.430 193.162.145.130 9614 0.057333000 0.001060000 0.001807621 0.023627000
52291 49535.702 195.249.0.39 9414 0.045397805 0.002265381 0.001852717 0.020964097
52291 49536.704 193.162.159.194 9414 0.045331000 0.000614000 0.001852621 0.020969000
52291 49588.888 193.162.145.130 9614 0.037996500 0.001003000 0.001852972 0.019336500
52291 49666.155 193.162.159.194 9414 0.029017000 0.000586000 0.001865980 0.016314000
52291 49666.157 195.249.0.39 9414 0.028799267 0.002373700 0.001874982 0.016598537
52291 49718.337 193.162.145.130 9614 0.023399500 0.001081000 0.001866273 0.014597000
52291 49793.595 193.162.159.194 9414 0.016723000 0.000578000 0.001855902 0.012294000
52291 49796.607 195.249.0.39 9414 0.016313820 0.002184681 0.001884182 0.012485447
52291 49847.783 193.162.145.130 9614 0.012258000 0.000976000 0.001871019 0.011141500
52291 49924.043 193.162.159.194 9414 0.007100500 0.000519000 0.001871371 0.009622500
52291 49924.044 195.249.0.39 9414 0.007001792 0.002332861 0.001864494 0.009312029
52291 49977.226 193.162.145.130 9614 0.003702000 0.001060000 0.001871488 0.008556000
52291 50052.481 193.162.159.194 9414 -0.000063000 0.000648000 0.001864222 0.007163500
52291 50054.489 195.249.0.39 9414 -0.000301628 0.002085120 0.001877033 0.007303420
52291 50106.667 193.162.145.130 9614 -0.002833000 0.001086000 0.001871664 0.006535000
52291 50309.354 193.162.159.194 9414 -0.010737000 0.000608000 0.002813148 0.010674000
52291 50312.562 195.249.0.39 9114 0.086954136 0.197965341 0.002828361 0.087255764
52291 50362.536 193.162.145.130 9614 -0.012754000 0.001200000 0.002809398 0.009921000
52291 50566.225 193.162.159.194 9414 0.011214500 0.000657000 0.003283832 0.021951500
52291 50571.244 195.249.0.39 9414 0.010926995 0.002349001 0.003307658 0.076027141
52291 50621.413 193.162.145.130 9614 0.039571000 0.001024000 0.003296840 0.052325000
52291 50823.101 193.162.159.194 9414 0.058264500 0.000591000 0.003515453 0.047050000
52291 50830.126 195.249.0.39 9414 0.057876921 0.002508241 0.003543498 0.046949926
52291 50878.290 193.162.145.130 9614 0.055245500 0.000969000 0.003521840 0.015674500
52291 51078.981 193.162.159.194 9414 0.036987500 0.000721000 0.003620101 0.021277000
52291 51088.014 195.249.0.39 9414 0.036031896 0.002076121 0.003650197 0.021845025
52291 51137.183 193.162.145.130 9614 0.031872000 0.001090000 0.003645531 0.023373500
52291 51592.737 193.162.159.194 9414 0.006079500 0.000605000 0.005581176 0.030908000
52291 51601.769 195.249.0.39 9414 0.005489940 0.002295021 0.005597385 0.030541956
52291 51650.937 193.162.145.130 9614 0.002876500 0.001125000 0.005593715 0.028995500
52291 52106.485 193.162.159.194 9414 -0.016892000 0.000680000 0.006550433 0.022971500
52291 52117.524 195.249.0.39 9414 -0.017519203 0.002103261 0.006574670 0.023009143
52291 52166.691 193.162.145.130 9614 -0.019588000 0.001082000 0.006571468 0.022464500
52291 52619.224 193.162.159.194 9414 -0.034779000 0.000598000 0.007016429 0.017887000
52291 52631.267 195.249.0.39 9414 -0.035318962 0.002275860 0.007037092 0.017799759
52291 52679.430 193.162.145.130 9414 -0.036850000 0.001132000 0.007026742 0.017262000
52291 53132.964 193.162.159.194 9114 0.072133000 0.000608000 0.007245648 0.106912000
52291 53146.010 195.249.0.39 9414 0.071593116 0.002279273 0.007264553 0.106912078
52291 53194.172 193.162.145.130 9414 0.069643500 0.001349000 0.007258070 0.106493500
52291 54162.464 193.162.159.194 9614 0.028902000 0.000570000 0.011177640 0.043231000
52291 54174.631 195.249.0.39 9414 0.089883839 0.127553861 0.011180783 0.018290723
52291 54221.665 193.162.145.130 9414 0.025810000 0.001210000 0.011168734 0.043833500
52291 55190.969 193.162.159.194 9614 0.097216500 0.000587000 0.013113636 0.068314500
52291 55202.050 195.249.0.39 9414 0.117492210 0.044496901 0.013108986 0.027608372
52291 55248.164 193.162.145.130 9414 0.093845000 0.001444000 0.013094183 0.068035000
root@qq6# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
+sltnxt3.ip.tele tix.ns.tele.dk 2 u 743 1024 377 44.497 117.492 27.608
*ns.tele.dk .GPS. 1 u 755 1024 377 0.587 97.216 68.314
+tix.ns.tele.dk .GPS. 1 u 697 1024 377 1.444 93.845 68.035
root@qq6# ntpdc -c loopinfo
offset: 0.060990 s
frequency: 110.569 ppm
poll adjust: 30
watchdog timer: 760 s
root@qq6# ntpdc -c kerninfo
pll offset: 0.050388 s
pll frequency: 110.569 ppm
maximum error: 0.501579 s
estimated error: 0.079597 s
status: 0001 pll
pll time constant: 6
precision: 1e-06 s
frequency tolerance: 512 ppm
pps frequency: 0.000 ppm
pps stability: 512.000 ppm
pps jitter: 0.0002 s
calibration interval: 4 s
calibration cycles: 0
jitter exceeded: 0
stability exceeded: 0
calibration errors: 0
root@qq6#
Johan Swenker
>
>When i track the offset to the ntp servers it does not stabilize even after
days.
>
>
>
>Only details below
>The system is an embedded system with an AMD sc520 processor(486++)
>Boot is from 8M flash to 32Mram.
>Kernel is 2.2.15
>
>ntpd is ntp-4.1.0b-rc3 and its compiled on a 2.2.14-5.0 box.
>(The symptoms has been seen with older versions too)
>
> snip of "ntpdate -dv |grep adjust" after a reboot and tickadj 10033 applied:
The symptoms you describe are very similar to what I noticed on a laptop.
(even the used value of tickadj is nearly the same).
I noticed the symptoms completely disappeared when I did run xosview. So, my
laptop is now running xosview (on a Xvnc X-server) and keeping time correctly.
To me the reason seems to be that both a laptop and a embedded system
try to save power when they don't have to do anything. Therefor they
either decrease the clock speed or some BIOS component steals cycles
to check wheather it can suspend the system. This theory is not
complete as xosview does remove the symptoms whereas a small C-program
that usleeps(100) continuously does not remove the symptoms.
I hope I somehow pointed someone into the right direction.
Regads, Johan Swenker