[ntp:questions] Re: Windows Accuracy

Jerry Baker jerry at novalid.invalid
Sat Jun 11 20:33:57 UTC 2005


David J Taylor wrote:
> Jerry Baker wrote:
>> I had posted some time back that NTP was having some real trouble on
>> my Windows XP Pro machine. It seems as though log on and log off
>> events cause Windows to lose some clock ticks. While away on vacation
>> for a few days I noticed that NTP was able to keep the machine to
>> within +/- 2ms. The theory appears to be correct.
>>
>> Just FYI.
> 
> Thanks, Jerry.  My own accuracies on unloaded systems are similar:
> 
>   http://www.david-taylor.myby.co.uk/mrtg/daily_ntp.html
> 
> These systems are permanently logged in.
> 
> With your log-on & log-off, are there any scripts associated with the 
> login process which might attempt to set the time - a NET TIME for 
> example?  On other question - is there a difference in behaviour between a 
> privileged user and normal user logging in and out?

Nothing sets the time on my machine except NTP. It's just that a log-in 
event seems to lose about 16ms instantly. Log-offs aren't as bad, but 
they are visible in a graph.



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