[ntp:questions] ntp-4.2.6p5 on Win 7 x64
martin.burnicki at meinberg.de
Fri Jul 25 10:15:51 UTC 2014
David Woolley wrote:
> On 24/07/14 11:21, Martin Burnicki wrote:
>> I'm assuming ntpd tries to synchronize the Windows time once every few
> I would expect it to be rather more frequent than that, as whilst the
> parameters might change only about once in seven or eight poll
> intervals, and the frequency may not change, the offset correction is
> applied in reducing increments so that there is only a finite integral,
> however long between updates.
I know, and if ntpd applies a "good" adjustment then Windows' tick
adjustment is often updated once per second.
What I meant is that ntpd eventually *steps* the Windows time every few
minutes, clears its filters, and starts from scratch.
Sorry for being imprecise.
Of setups where ntpd is unable to settle under Windows I've seen cases
where ntpd then simply does nothing because the jitter is really much
On the other hand there are cases where the system time is just stepped
since an offset has been determined which exceeds 128 ms, and the game
starts over from scratch every few minutes since the data collected from
the next polls also provide very large jitter and offset.
Of course this happens only if timekeeping is broken as in the case
More information about the questions