Another 11.1-RELEASE install minor annoyance (ntpd)

[Raimund Sacherer]

>   Second, ntpd, internally, is built on a phase-locked loop, which is
>   supposed to stabilize its time corrections in the face of jitter and
> other
>   bad things out in the real world.  Like anything based on a negative
>   feedback loop, however, it can be destablized with certain inputs.
>   Giving ntpd two or more servers is a pretty good way to destabilize its
>   PLL in the real, non-ideal world we find on the modern Internet.
>   To anyone considering flaming me, please read this first:
>
>       http://queue.acm.org/detail.cfm?id=1773943
>
>   At minimum, read the section "One server is enough".  The bit on PLLs
>   about halfway down is also directly relevant.
>
> Hello,

I read the article, but I am astonished, I am by no means any expert in
time, but the article is from a lot of years back and I was questioning
what was written there. Is ntp really working like they say, jumping from
one time server to another? I thought it to be some sort of consensus based
protocoll where it queries a couple of servers, boots off servers which are
way off, and creates a consensus on the remaining ones?

I would love if someone knowledgable how the protocol works could say if it
really is better to have one server instead of a couple more? If so, than
why most default configuration (like ubuntu) have 4 or 5 servers
configured?

The article also read a bit as promotional vehicle for radclock, but
checking out radclocks webpage, their last modification seems to be 2015,
and they still claim the "we like to have ready in 2 years" statement they
had in 2008 ....


Best
Ray



> --
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>
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