Re: [chrony-dev] Wild frequency fluctuations in macOS 13.2

[Bryan Christianson]

> On 9/12/2017, at 6:10 PM, Gerriet M. Denkmann  wrote:
> 
> 
> 
>> On 9 Dec 2017, at 10:31, Bryan Christianson  wrote:
>> 
>> If you have not disabled  timed by specifying an unknown ip address or 
>> hostname in the Date System preferences pane, then that could possibly 
>> explain the result. 
> 
> I had System Preferences → Date & Time → Date & Time → “Set data and time 
> automatically” set to off several years ago.
> Maybe some Installer did reset this.
> 
> I have now set it again to off (but the textField still has: “Apple Asia 
> (time.asia.apple.com.)”).
> Thanks to making me check this check-box again.
> 
> timed is still running (as it should).
> 

Unfortunately there is bug in timed - even when “Set data and time 
automatically” is disabled, it will still poll whatever server is defined in 
the disabled text field and attempt to adjust the clock. i.e. the check box 
does nothing except stopping you from changing the server.

I suggest you set the text field to 'unknown-ntp-server' and try again.

I think there is no need for the chrony patch you suggest. In chronycontrol, 
this is handled by the installation script. See 
http://whatroute.net/chronycontrol.html

Bryan Christianson
br...@whatroute.net




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Re: [chrony-dev] Wild frequency fluctuations in macOS 13.2

[Bryan Christianson]

If you have not disabled  timed by specifying an unknown ip address or hostname 
in the Date System preferences pane, then that could possibly explain the 
result. 

This is required for chronyd as timed continues to run even when automatic 
updates are disabled in Preferences.

Alternatively, you may have a bad connection to whatever NTP servers you are 
using in chronyd.

Regards
Bryan

> On 9/12/2017, at 2:34 PM, Gerriet M. Denkmann  wrote:
> 
> chronyd 3.2,  macOS 13.2.
> 
> The usual frequency of my computer is 18 … 19 ppm (roughly depending on time 
> of day).
> 
> Starting chronyd I see wild changes in frequency from 15 to 75 ppm for more 
> than 6 h before it finally settles down to a reasonable value.
> The period of these fluctuations is about 15 minutes, e.g.:
> 2017-12-08 22:42:51   +21.220   
> 2017-12-08 22:47:10   +73.421  
> 2017-12-08 22:57:57   +33.983  
> 
> A full tracking.log is available upon request (but probably too large for a 
> mailing list).
> 
> This is something I have never seen with chronyd 2.3 / macOS 12.x.
> 
> What can I do?
> 
> Gerriet.
> 
> 
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> 



Bryan Christianson
br...@whatroute.net




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[chrony-dev] Wild frequency fluctuations in macOS 13.2

[Gerriet M. Denkmann]

chronyd 3.2,  macOS 13.2.

The usual frequency of my computer is 18 … 19 ppm (roughly depending on time of 
day).

Starting chronyd I see wild changes in frequency from 15 to 75 ppm for more 
than 6 h before it finally settles down to a reasonable value.
The period of these fluctuations is about 15 minutes, e.g.:
2017-12-08 22:42:51 +21.220   
2017-12-08 22:47:10 +73.421  
2017-12-08 22:57:57 +33.983  

A full tracking.log is available upon request (but probably too large for a 
mailing list).

This is something I have never seen with chronyd 2.3 / macOS 12.x.

What can I do?

Gerriet.


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