[ntp:questions] Win7: ntpd adjusting time backwards

unruh unruh at invalid.ca
Thu Dec 13 23:08:48 UTC 2012

On 2012-12-13, E-Mail Sent to this address will be added to the BlackLists <Null at BlackList.Anitech-Systems.invalid> wrote:
> Jeroen Mostert wrote:> BlackLists wrote:
>>> ntpq -c "rv&0 precision"
>>>   should give a clue how close you can expect to get on
>>>    a given machine.
>> I assume you mean 'ntpq -c "rv 0 precision"'.
>>  Your command gives me an error.
> Yes, however it should work with the '&' on newer 4.2.7 flavors.
>> I'm not sure that means much. On the physical machines
>>   I get precision=-10, which makes sense since the multimedia
>>   timer is on and the resolution of GSTAFT is 1 ms.
>>  On the virtuals, however, I get -19 (ntpd 4.2.6p5) and -20
>>  (ntpd 4.2.7p310).
>>  That may reflect the numerical precision of the interpolated
>>   clock, but that doesn't mean actually reading it with
>>   that precision is useful.
> That Precision is supposed to represent the time it takes
>   to read the system clock.

It is also supposed to reflect the time between changes of the system
>  So whatever that is, you shouldn't expect a application
>   to be able to "get time" more often.

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