Re: Linux 2.6.29-rc6
From: Jesper Krogh
Date: Wed Mar 04 2009 - 10:31:27 EST
john stultz wrote:
I guess something to test my idea above (that the drift is bad enough
that NTPd isn't making slew adjustments via adjtimex offset) is to
remove NTPd from the init.d startup.
Then after rebooting (into 2.6.29), run the attached python script for
10 minutes or so to get an idea of the ppm drift. Then repeat with
2.6.26.
To run:
./drift-test.py <ntp server>
It will give some wild ppm numbers, but after a few minutes it should
settle down to the "natural drift" of the system.
Ok. I removed ntpd from the system... heres is from "non-working
2.6.28.7 kernel".
04 Mar 14:59:16 offset: -0.139829 drift: -656.0 ppm
04 Mar 15:00:16 offset: -0.175233 drift: -591.147540984 ppm
04 Mar 15:01:16 offset: -0.210637 drift: -590.611570248 ppm
04 Mar 15:02:16 offset: -0.246033 drift: -590.386740331 ppm
04 Mar 15:03:17 offset: -0.28144 drift: -587.880165289 ppm
04 Mar 15:04:17 offset: -0.31684 drift: -588.301324503 ppm
04 Mar 15:05:17 offset: -0.352247 drift: -588.602209945 ppm
04 Mar 15:06:17 offset: -0.387649 drift: -588.805687204 ppm
04 Mar 15:07:17 offset: -0.423046 drift: -588.94813278 ppm
04 Mar 15:08:17 offset: -0.458451 drift: -589.073800738 ppm
04 Mar 15:09:18 offset: -0.493856 drift: -588.1973466 ppm
04 Mar 15:10:18 offset: -0.529265 drift: -588.374057315 ppm
04 Mar 15:11:18 offset: -0.564661 drift: -588.503457815 ppm
04 Mar 15:12:18 offset: -0.600063 drift: -588.620689655 ppm
04 Mar 15:13:18 offset: -0.635458 drift: -588.712930012 ppm
04 Mar 15:14:18 offset: -0.040699 drift: 109.052048726 ppm
04 Mar 15:15:18 offset: -0.076098 drift: 65.4984423676 ppm
04 Mar 15:16:18 offset: -0.111495 drift: 27.0557184751 ppm
04 Mar 15:17:18 offset: -0.146885 drift: -7.12096029548 ppm
04 Mar 15:18:19 offset: -0.182285 drift: -37.6853146853 ppm
04 Mar 15:19:19 offset: -0.217688 drift: -65.2117940199 ppm
04 Mar 15:20:19 offset: -0.253085 drift: -90.1202531646 ppm
04 Mar 15:21:19 offset: -0.288479 drift: -112.768882175 ppm
04 Mar 15:22:19 offset: -0.323866 drift: -133.448699422 ppm
04 Mar 15:23:19 offset: -0.359259 drift: -152.414127424 ppm
04 Mar 15:24:20 offset: -0.394648 drift: -169.750830565 ppm
04 Mar 15:25:20 offset: -0.430047 drift: -185.861980831 ppm
04 Mar 15:26:20 offset: -0.46544 drift: -200.779692308 ppm
04 Mar 15:27:20 offset: -0.500835 drift: -214.63620178 ppm
04 Mar 15:28:20 offset: -0.536221 drift: -227.534670487 ppm
04 Mar 15:29:20 offset: -0.571605 drift: -239.574515235 ppm
04 Mar 15:30:21 offset: -0.606992 drift: -250.706859593 ppm
04 Mar 15:31:21 offset: -0.64241 drift: -261.286085151 ppm
04 Mar 15:32:21 offset: -0.677792 drift: -271.20795569 ppm
04 Mar 15:33:21 offset: -0.713187 drift: -280.554252199 ppm
04 Mar 15:34:21 offset: -0.040744 drift: 46.7374169041 ppm
04 Mar 15:35:21 offset: -0.076145 drift: 29.0987996307 ppm
04 Mar 15:36:21 offset: -0.111551 drift: 12.4088050314 ppm
04 Mar 15:37:21 offset: -0.146952 drift: -3.40288713911 ppm
And from working 2.6.27.19 kernel.
jk@quad12:~$ python drift-test.py 10.192.96.19
04 Mar 16:17:23 offset: -0.006929 drift: -62.0 ppm
04 Mar 16:18:24 offset: -0.010252 drift: -54.5967741935 ppm
04 Mar 16:19:24 offset: -0.013574 drift: -54.9754098361 ppm
04 Mar 16:20:24 offset: -0.016897 drift: -55.1098901099 ppm
04 Mar 16:21:24 offset: -0.020233 drift: -55.2314049587 ppm
04 Mar 16:22:24 offset: -0.023566 drift: -55.2947019868 ppm
04 Mar 16:23:24 offset: -0.026895 drift: -55.3259668508 ppm
04 Mar 16:24:24 offset: -0.030217 drift: -55.3317535545 ppm
04 Mar 16:25:24 offset: -0.033539 drift: -55.3360995851 ppm
04 Mar 16:26:24 offset: -0.036865 drift: -55.3468634686 ppm
04 Mar 16:27:25 offset: -0.038266 drift: -52.0713101161 ppm
04 Mar 16:28:25 offset: -0.039747 drift: -49.592760181 ppm
04 Mar 16:29:25 offset: -0.041331 drift: -47.6680497925 ppm
--
Jesper
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