[ntp:questions] GPS driver failure mode question

Terje Mathisen terje.mathisen at hda.hydro.com
Mon Jan 12 20:15:57 UTC 2009


Unruh wrote:
> Steve Kostecke <kostecke at ntp.org> writes:
>> Never.
> 
>> The Undisciplined Clock Driver does poll the system clock
>> (often misleadingly referred to as the "local clock") _but_ the poll
>> results are discarded. So ntpd never actually serves time _from_ the
>> Undisciplined Local Clock.
> 
> 
> Sorry there is some sematic distinction going on here that I do not follow. 
> ntp always "serves time" from the system clock. The question is how and
> whether ntp thinks that system clock itself is being disciplined. If it is
> disciplined by nothing it does not act as a server, and says so. If it is

It can still do so, but definitely not by default!

> "disciplined " by local clock, it is still disciplined by nothing, but can
> act as an ntp server, and tells outside clients that it is being
> disciplined by the local clock. Am I wrong in my understanding?

Slightly, see the documentation page for the local clock driver:

http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver1.html

Terje

-- 
- <Terje.Mathisen at hda.hydro.com>
"almost all programming can be viewed as an exercise in caching"




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