[ntp:questions] setting the time/frequency before starting ntpd to avoid slow convergence (PPS)
david-taylor at blueyonder.co.uk.invalid
Sat Oct 13 03:49:24 UTC 2012
On 13/10/2012 00:25, Richard B. Gilbert wrote:
> On 10/12/2012 6:25 PM, gabs wrote:
>> Instead of waiting several minutes (hours?) to reach microsecond
>> offsets, I've been using a chrony-like
> method to set the time and frequency before starting ntpd:
> It's hours! About ten hours to get the best time the system is capable of!
As I've mentioned before, 10 hours may be much longer than is needed for
some systems. Many PCs here settle to the best they can reach within a
few minutes, but I am referring to Windows PCs either with a local time
source (GPS/PPS), or with a short polling interval to LAN-based
stratum-1 servers. But these are not "microsecond offset" systems.
BTW: I now have one Windows-8 system which is Wi-Fi connected and
showing very good performance, doubtless due in part to the new precise
GetSystemTime function call. On the other hand, I have another Wi-Fi
connected WIndows-8 PC which has "average" performance. How well Wi-Fi
works seems to be a little luck of the draw....
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