[ntp:questions] Win7: ntpd adjusting time backwards
jmostert at xs4all.nl
Thu Dec 13 05:53:57 UTC 2012
On 2012-12-13 02:41, E-Mail Sent to this address will be added to the BlackLists
> Jeroen Mostert wrote:
>> GetSystemTimePreciseAsFileTime() is available, but most
>> of our machines are still Windows Server 2008/2008 R2
>> (even with some 2003 server still hanging around).
>> On the physical machines, GetSystemTimeAsFileTime() will
>> get the time with 1 ms resolution since the MM timer
>> will be enabled, which is good enough.
>> On the virtual machines, however, GSTAFT cannot do better
>> than the 15.625 ms resolution it has by default.
> 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.
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.
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