[ntp:questions] What level of timesynch error is typical on Win XP?

Alexander Petrov (Moscow, Russia) alpet1 at gmail.com
Thu Oct 21 05:37:37 UTC 2010


On 21 окт, 00:59, E-Mail Sent to this address will be added to the
BlackLists <N... at BlackList.Anitech-Systems.invalid> wrote:
> > By default, the timer resolution 15.625 ms (1/64 second),
> >  ... increase the timer resolution.
>
> Current PCs' HPET timer is in the few NanoSeconds range?
>  and the ACPI timer is in the few dozen NanoSeconds range?

Yes, is very high resolution, but:
1. Some programs not used this for adjusting timestamps, in self
implementation of NTP requests. Or using it's without set thread
affinity to CPU core.
2. Frequency unstable and floats due to various factors, from CPU
consumpion level to powersaving CPU downclocking, PC environment, etc.
So coefficients (clocks to msec) must regular recalibrated with
precised source. Сertainly in the range of 16 ms, the error will tend
to zero




More information about the questions mailing list