[ntp:questions] 500ppm - is it too small?

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Thu May 7 19:49:47 UTC 2009

Hal Murray wrote:
>> An greater than 500 PPM suggests seriously broken hardware!
> Or software.

This sounds a lot like the trouble many Linux boxes got into with 
HZ=1000, where dropped timer ticks could cause all sorts of problems in 
the form of unstable systems clocks that seemed to lose a lot more than 
500 ppm.


- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

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