[ntp:questions] Re: Ntp-4.1.2: tinker step 0; always slew and kernel time discipline

David L. Mills mills at udel.edu
Fri Feb 18 02:23:54 UTC 2005


In truth, the kernel is disabled only if the actual correction is 
greater than 0.5 s no matter what the tinker. However, there could be 
grief if the discipline switches from one to the other. There are a 
rather large number of untested and probably dangerous things that might 
happen with uncharted combinations of tinkers and I'm not thrilled when 
spending lots of time fixing the broken combinations. You are on your 
own, but a "diable kernel" command might be appropriate.


Nikolaev, Sergey wrote:
> We have a requirement to always slew the clock even if it means long periods of time to correct the offset.
> The NTP documentation mentions this tinker option:
> step step 
> The argument is the step threshold, by default 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. 
> Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default.
> However when I set "tinker step 0" and restart ntpd, I see in "ntpdc -c sysinfo" that the kernel flag is still enabled.
> Obviously, it is not disabled automaticly just by setting "tinker step 0".
> Do I need to disable it explicitly? 
> Thanks in advance,
> Sergey
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