Administrace komentářů

Tak jsem byl přehnaně optimistický. NTP server se rozkmitává pořád. Chci se zeptat jak vám drží ntp u lennyho. Jádro u mne je 2.6.26-2-xen-amd64 a kus výpisu ze začátku loopstats.log tady:

55151 145.900 0.008428000 19.747 0.002846460 2.027542 6
55151 337.900 0.011902000 21.926 0.002932280 2.047130 6
55151 812.906 0.014909000 28.680 0.002941677 3.060796 6
55151 1072.906 0.017950000 33.131 0.002954337 3.267051 6
55151 1110.899 0.017933000 33.781 0.002763536 3.064671 6
55151 1305.901 0.017718000 37.076 0.002586168 3.094396 6
55151 1673.900 0.016638000 42.915 0.002449074 3.555323 6
55151 2012.902 0.012448000 46.939 0.002728174 3.617283 6
55151 2343.901 0.006291000 48.925 0.003354284 3.455734 6
55151 2515.903 0.003635000 49.521 0.003275146 3.239410 6
55151 2765.899 0.001887000 49.971 0.003125330 3.034362 6
55151 2915.902 -0.004441000 49.336 0.003681355 2.847259 6
55151 3337.899 -0.006363000 46.775 0.003509993 2.813046 6
55151 3533.900 -0.014744000 44.019 0.004422656 2.805973 6
55151 3661.901 -0.016347000 42.024 0.004175672 2.717911 6
55151 4081.899 -0.022812000 32.887 0.004525560 4.110924 6
55151 4427.899 -0.023630000 25.089 0.004243137 4.731472 6
55151 4534.901 -0.023710000 22.670 0.003969191 4.507792 6
55151 4833.901 -0.021872000 16.433 0.003769270 4.758396 6
55151 4980.902 -0.020210000 13.600 0.003574464 4.562394 6
55151 5107.900 -0.020325000 11.138 0.003343853 4.355572 6
55151 5594.901 -0.016403000 3.520 0.003421424 4.884081 6
55151 5624.901 -0.010403000 3.222 0.003839778 4.569851 6
55151 5660.901 -0.007829000 2.954 0.003705258 4.275760 6
55151 5725.901 -0.006099000 2.576 0.003519508 4.001840 6
55151 6075.898 -0.002322000 1.800 0.003552699 3.753395 6
55151 6143.898 0.004031000 2.062 0.004011122 3.512196 6
55151 6208.902 0.007320000 2.516 0.003928153 3.289273 6
55151 6336.899 0.009347000 3.657 0.003743697 3.103165 6
55151 6399.899 0.009847000 4.248 0.003506367 2.910272 6
55151 6911.901 0.021650000 14.820 0.005307538 4.623850 6
55151 7136.957 0.024135000 19.998 0.005041903 4.696807 6
55151 7432.899 0.031896000 29.002 0.005456386 5.425509 6
55151 7592.903 0.034363000 34.246 0.005177958 5.403078 6
55151 8007.902 0.033619000 47.551 0.004850678 6.904624 6
55151 8375.899 0.029735000 57.987 0.004740612 7.438227 6
55151 8657.900 0.026207000 65.035 0.004606470 7.390578 6
55151 8761.903 0.016759000 66.697 0.005452263 6.938185 6
55151 8941.945 0.011792000 68.721 0.005393958 6.529418 6
55151 9156.915 0.009330000 70.634 0.005120108 6.145047 6
55151 9427.900 0.000281000 70.707 0.005759757 5.748222 6
55151 9691.899 -0.010729000 68.006 0.006646790 5.461125 6
55151 9886.900 -0.025835000 63.201 0.008196360 5.383422 6
55151 10363.921 -0.038254000 45.799 0.008835244 7.950571 6
55151 10530.902 -0.044299000 38.744 0.008536529 7.844243 6
55151 10661.899 -0.046864000 32.889 0.008036520 7.624005 6
55151 11089.901 -0.048186000 13.221 0.007531983 9.960652 6
55151 11346.900 -0.047873000 1.488 0.007046394 10.199110 6
55151 11440.900 -0.045132000 -2.558 0.006662139 9.647032 6

Jako signifikantní mi připadá hlavně 4 sloupec (diference, nebo kompenzace driftu) ta by měla se ustalovat ale rozkmitává se a je vidět, že třeba při pruchodu hodnoty v třetím sloupci nulou (což je přesný čas) je 4 pořád dále od rovnováhy (nekde kolem cca 2)a hodiny proběhnou nulou čím dále rychleji. Něco je špatně v tom nastavení pro slewing, kmit se netlumí a zvětšuje. Nakonec se kmit dostane tak daleko, že zabere ten druhý mechanismus NTP - steeping, hodiny skočí jednorázově na přesný čas, a rozmitávání pokračuje znovu od začátku. Tady je pozdější část výpisu z dnešního večera

55151 49817.201 -0.041739000 -66.877 0.012851299 17.168982 6
55151 49882.200 -0.040563000 -69.391 0.012028477 16.084698 6
55151 50393.201 -0.001224000 -69.988 0.017889633 15.047335 6
55151 50586.201 0.000433000 -69.908 0.016744475 14.075521 6
55151 50723.204 0.036020000 -65.202 0.020090550 13.271161 6
55151 50910.202 0.045106000 -57.158 0.019065581 12.735644 6
55151 51172.203 0.063584000 -41.270 0.018993159 13.170904 6
55151 51518.215 0.110223000 -4.900 0.024239358 17.808417 6
55151 51566.200 0.112391000 0.245 0.022686796 16.757265 6
55151 52006.200 0.121623000 51.280 0.021471101 23.901402 6
55151 52135.201 0.126260000 66.813 0.020151170 23.022308 6
55151 52329.200 0.126122000 90.147 0.018849756 23.061525 6
55151 52461.200 0.118782000 105.100 0.017822321 22.210430 6
55151 52465.200 0.116523000 105.544 0.016690363 20.776550 6
55151 52706.220 0.101738000 128.927 0.016464330 21.119954 6
55151 52919.201 0.086932000 146.586 0.016266241 20.718947 6
55151 53249.202 0.060677000 165.682 0.017823732 20.523076 6
55151 53437.201 0.034551000 171.877 0.019060243 19.322107 6
55151 53438.201 0.028855000 171.904 0.017942588 18.074179 6
55151 53959.203 -0.017007000 163.454 0.023336852 17.168784 6
55151 54094.201 -0.050798000 156.914 0.024884978 16.225528 6
55151 54217.200 -0.067402000 149.008 0.024006625 15.432860 6
55151 54605.201 -0.119836000 104.665 0.029119488 21.311558 6
55151 55551.991 0.000000000 104.665 0.000000954 19.935137 4
55151 55594.006 -0.005050000 104.458 0.001785509 18.647757 6
55151 55649.994 -0.005748000 104.157 0.001688293 17.443705 6
55151 55714.993 -0.005664000 103.805 0.001579532 16.317564 6
55151 55777.991 -0.005926000 103.449 0.001480432 15.264202 6
55151 55973.992 -0.022412000 99.260 0.005990656 14.354969 6
55151 56187.992 -0.035184000 92.080 0.007196769 13.665726 6
55151 56293.991 -0.044389000 87.592 0.007477389 12.881187 6
55151 56673.991 -0.056754000 67.025 0.008248247 14.073444 6
55151 56800.991 -0.079227000 57.429 0.011075107 13.594624 6
55151 57312.993 -0.086009000 15.433 0.010633660 19.549327 6
55151 57537.992 -0.092855000 -4.492 0.010237136 19.596618 6
55151 57652.992 -0.089585000 -14.317 0.009645466 18.657180 6
55151 58032.995 -0.084727000 -45.022 0.009184542 20.553022 6
55151 58272.018 -0.071303000 -61.342 0.009815229 20.072768 6
55151 58369.993 -0.043494000 -65.365 0.013452309 18.830164 6
55151 58504.992 -0.046128000 -71.304 0.012617900 17.738710 6
55151 58569.991 -0.036508000 -73.567 0.012283211 16.612324 6
55151 58676.992 -0.023656000 -75.981 0.012355787 15.562825 6
55151 58792.990 -0.017786000 -77.949 0.011742627 14.574302 6
55151 59211.989 0.027119000 -67.112 0.019305709 14.161131 6
55151 59558.005 0.050079000 -50.540 0.019799342 14.484506 6
55151 59738.993 0.077672000 -37.206 0.020932821 14.345657 6
55151 60131.992 0.093442000 -2.185 0.020359212 18.258869 6
55151 60255.991 0.109841000 10.804 0.019907345 17.686245 6
55151 60447.993 0.125617000 33.806 0.019438974 18.434601 6
55151 60638.991 0.126238000 56.800 0.018184822 19.064324 6
55151 60701.991 0.125936000 64.367 0.017010678 18.032574 6
55151 61087.993 0.112823000 105.899 0.016573676 22.363868 6
55151 61307.992 0.110297000 129.040 0.015528962 22.462510 6
55151 61340.992 0.094752000 132.022 0.015530994 21.038188 6
55151 61403.993 0.095950000 137.787 0.014534094 19.784686 6
55151 61917.992 0.064821000 169.561 0.017491931 21.649642 6
55151 62210.990 0.032193000 178.557 0.020019854 20.499602 6
55151 62434.994 -0.008908000 176.654 0.023703478 19.187421 6
55151 62858.993 -0.063620000 150.929 0.029424503 20.121159 6
55151 62922.990 -0.098261000 144.931 0.030125906 18.940683 6
55151 62988.992 -0.100641000 138.597 0.028192771 17.858379 6
55151 63921.772 0.000000000 138.597 0.000000954 16.704984 4
55151 63948.776 -0.005915000 138.444 0.002091407 15.626174 6
55151 63953.774 -0.006356000 138.414 0.001962526 14.616951 6
55151 63964.794 -0.008058000 138.329 0.001931893 13.672939 6
55151 63999.771 -0.010674000 137.973 0.002029977 12.790483 6
55151 64459.770 -0.042556000 119.304 0.011430933 13.664292 6
55151 64589.770 -0.044815000 113.748 0.010722439 12.931840 6
55151 64941.774 -0.074640000 88.692 0.014552990 14.993491 6
55151 65099.772 -0.102885000 73.189 0.016883248 15.058094 6
55151 65221.772 -0.114440000 59.874 0.016312668 14.851388 6
55151 65551.772 -0.119799000 22.172 0.015376287 19.252938 6
55151 65883.785 -0.122427000 -16.591 0.014413162 22.630964 6
55151 66063.772 -0.122426000 -37.606 0.013482279 22.435431 6
55151 66305.770 -0.102919000 -61.359 0.014374084 22.604274 6
55151 66822.770 -0.073087000 -97.395 0.017088933 24.686105 6
55151 67099.771 -0.058722000 -112.907 0.016772579 23.734108 6
55151 67148.770 -0.023018000 -113.983 0.020137168 22.204482 6
55151 67660.772 0.014313000 -106.994 0.023000340 20.916847 6
55151 67749.785 0.054777000 -102.345 0.025837173 19.634847 6
55151 67999.772 0.084954000 -82.090 0.026418695 19.713384 6
55151 68056.772 0.105098000 -76.377 0.025718197 18.550477 6
55151 68120.771 0.103884000 -70.036 0.024061000 17.496587 6
55151 68186.771 0.113981000 -62.862 0.022788376 16.561943 6
55151 69149.990 0.000000000 -62.862 0.000000954 15.492280 4
55151 69173.993 0.002452000 -62.806 0.000867090 14.491714 6
55151 69176.994 0.002586000 -62.799 0.000812460 13.555758 6
55151 69485.997 0.019067000 -57.180 0.005876319 12.834915 6
55151 69719.993 0.040129000 -48.225 0.009255636 12.416424 6

Skoková synchronizace nastáva v časech 55551.991, 63921.772 a 69149.990. Pomohlo by mi když byste se ozvali uživatelé s lennym, jak stabilní hodiny mají oni? Možná jich je má nestabilní více jen si nevšimli. Je jasné, že s chybou 100ms se dá žít, ten steeping to dále nepustí, ale proč to nedoladit na přesno. Ještě někdo se ptal na rychlost připojení, mašina je 2x4jádrový xeon 5000 s 72GB paměti a 1GB připojením a plnou 1GB propustností na většinu NTP serverů. Je v reku v klimatizované servrovně takže ani teplotní fluktuace nejsou významné. A jen poznámka, na domácím desktopu mám opensuse a to je přesné, v rámci tedy toho, co mnohem horší ADSL linka dává. Může to být chyba v distribuci, proto se ptám lidí s běžícím lennym, kdy někdo mohl posunout konstanty s ideou "zrychlí se tím konvengence", ale nedošlo mu, že když to přežene, systém se rozkmitá.