Re: [Xen-users] dom0 and domU differs after ntpdate

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Marco Strullato wrote:
> I'm sorry, I think I don't well understand what you wrote. could you 
> be more clear?
> why you suggest me not to run ntp on domUs? Maybe I don't know how xen 
> works with ntp....
> Thanks
>
> Marco
All NTP daemons work by manipulating a time offset, an offset between 
the clock time reported by the hardware clock and the actual time as 
deduced from NTP servers. And they also have a second offset, one that 
allows them to retain a record over some period of the amount of drift 
that consistently happens and adjust for it. It's described here:
   http://en.wikipedia.org/wiki/Network_Time_Protocol

OK? Now imagine that you're a surveyor doing careful work, and you put 
some markers down in a convenient place, and you measure how long things 
are, and where they are, and you make a nice map, and you record where 
your markers very carefully so you can rely on them.
Now imagine some other surveyor starts taking and using your marker, and 
*keeps moving it* when you're not looking. You can never hope to get all 
your maps done accurately while this is going on.
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