linux-kernel - Re: Linux 2.6.29-rc6

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Date:	Wed, 04 Mar 2009 19:36:43 +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

Jesper Krogh wrote:
> 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 

Updated. I think I has NTPd running in the former "non-working" test. I 
just tried to reproduce the numbers, and they look like this 
(reproducible on 2.6.29-rc6).

jk@...d12:~$ python drift-test.py 10.192.96.19
04 Mar 19:27:10         offset: -0.157696       drift: -693.0 ppm
04 Mar 19:28:10         offset: -0.195134       drift: -625.098360656 ppm
04 Mar 19:29:10         offset: -0.232579       drift: -624.595041322 ppm
04 Mar 19:30:10         offset: -0.270021       drift: -624.408839779 ppm
04 Mar 19:31:11         offset: -0.307461       drift: -621.727272727 ppm
04 Mar 19:32:11         offset: -0.344903       drift: -622.185430464 ppm
04 Mar 19:33:11         offset: -0.382345       drift: -622.491712707 ppm
04 Mar 19:34:11         offset: -0.419794       drift: -622.727488152 ppm
04 Mar 19:35:11         offset: -0.457239       drift: -622.89626556 ppm

Still the same.

> 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
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