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Date: Wed, 04 Mar 2009 16:30:44 +0100 From: Jesper Krogh <jesper@...gh.cc> To: john stultz <johnstul@...ibm.com> CC: Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Len Brown <len.brown@...el.com> Subject: Re: Linux 2.6.29-rc6 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@...d12:~$ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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