David Rush wrote:
Well, I spoke too soon, I think. Machine 2 stayed within 100 ms only for a little more than half an hour. It strayed as much as -1.6 seconds before correcting back to +0.0018 sec. Then it did this minor-drift-and-correct dance a couple times, and now it's strayed to over +9 seconds in about 80 minutes. Hey, it just corrected back to -0.13 sec.

After the initial success with machine 2, I ran the same magic commands on machine 1, and it's stayed within 1 second for over 5 hours now.

Any more suggestions? Or should I give it more time before passing judgment?

Windows is simply not very good about keeping time! It can lose clock interrupts when busy. Starting and stopping the multimedia timers can mess up the clock.

W32TIME is an implementation of SNTP rather than NTP. It's not even a very good implementation of SNTP. You may get better results with NTP. Then again, Windows being Windows, you may not.

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