[ntp:questions] Recommendations for having offset < N milliseconds

thecarrionkind thecarrionkind at gmail.com
Fri May 4 22:59:02 UTC 2012

On 4 mai 2012, at 16:56, unruh <unruh at invalid.ca> wrote:

> On 2012-05-03, Lloyd Dizon <thecarrionkind at gmail.com> wrote:
>> Hi,
>> Do you have any recommendations on how to configure ntpd so that it
>> reacts and resets correct time when offset increases by 100 ms?
>> I'm running ntpd on virtual machine and have tried playing with the
>> server minpoll and maxpoll options, but haven't been successful.
>> Thanks for your opinion and pointers.
> It is not productive to run ntpd on a virtual machine. Run it on the
> real machine underneath and get the time from there. Virtual machines
> have highly inconsistant system clocks. 

The virtualization solution I am using, Xen recommends running ntp.

> And ntpd does reseat the time if it is off by 128ms Of course you
> probably have to wait 8 cycles so it can be sure that it is the time
> that is off and not the roundtrip. 

Why 128ms? How is this value calculated and how can I change this?
Can you explain this or point to documentation?

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