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Technical Notes

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Reading the System Clock

NTP's sys_fuzz_nsec is the time it takes to read the clock in nanoseconds (it's an integer type), and sys_tick is the same thing in a floating type but in usec. sys_precision is log2 of sys_tick.

Some systems have clock_getres() and it behaves differently on different OSes. NTP generally uses CLOCK_REALTIME for its operations, but on some OSes that value will not give use the information we want:

OSSorted ascending sys_fuzz_nsec sys_tick CLOCK_REALTIME Other
FreeSBD7 1676 1.676 280  
Solaris10 916 0.916 1000000 83 CLOCK_HIGHRES


This topic: Dev > WebHome > TechnicalNotes
Topic revision: r1 - 2012-12-27 - 08:13:08 - HarlanStenn
 
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