Thank you every body for your comments. Especially Jeff Epler for your hint about NTP. You're right. I see a (constant but somewhat huge)time drift of about 1 ms/min which I can correct for. Thank you Steve Horsley for the clarification of the interrupts that would end the delay. I didn't think of something as trivial as ^C. And thank you Nick Craig-Wood for the shell script to get hands on the HZ value. I had to modify it a little as I do not have /proc/interrupts, but I've got the idea. I measure about 100 and so I have a 10 ms granularity in my VPS as you predicted. Erich
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