Ananth Shenoy wrote:
NTP version 4.2.0
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 ?
Also, what are the effects of heavy load on the system ?
If suppose NTP is running on low priority and some high priority processes
continously preempt NTP from getting the CPU what will happen. Will then
calculations of offset go wrong ?
If it was calculating the offset in process_packet function, and it got
pre-empted and got the CPU after a while, what will happen to the calculations ?
NTPD needs to run at high priority. It needs less than 1% of most CPUs
and the effects of running it at high priority should not be noticeable.
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