Recently, I was reading the source code of NTP ports for windows. In 
\NTP\ntp-4.2.6p1\ports\winnt\ntpd\nt_clockstuff.c I noticed the period of 
TimerApcFunction is set to 43ms as default value for a 64Hz OS (which has clock 
resolution of 15.625ms). Where is this 43ms come from? Based on experiment 
result? I don't have a clue. Can someone give me some light?

Regards,
Chaofu



      

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