Ananth Shenoy wrote:
NTP version 4.2.0
Obsolescent.
I'am currently working on a problem on NTP. NTP log files show lot of drift.. The offset and frequency keep increasing and once the frequency rises above 500ppm the NTP displays error message. frequency error 513 PPM exceeds tolerance 500 PPM we see the offset bouncing around in +ve and -ve values sometimes high and low. what could be the cause of this ?
What OS. Please confirm that you are running this on a physical machine as one thing that could easily cause this is trying to run nptd on a virtual machine.
On a real machine, this would indicate a grossly overloaded network, or a device driver with poor latency. Goint to the frequency end stop in one direction can also mean a very bad motherboard crystal.
Power management can also cause problems, and should be disabled.
Also, what are the effects of heavy load on the system ? If suppose NTP is running on low priority and some high priority
You would have a broken ntp installation. On systems that support it, ntpd tries to set real time priority.
processes continously preempt NTP from getting the CPU what will happen. Will then calculations of offset go wrong ?
The calculation will not go wrong, but the scheduling delays will come a significant part of the error term. Note that, when working properly, offset is all error term.
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