On Sun, Sep 06, 2009 at 03:53:23AM +0000, David Mills wrote: > No, what you suggest is properly called resolution, not precision. Do > your homework; -21 is just fine for a Sun faster than mine, where the > precision is -20. Confirm that the jitter.c program, included in the NTP > distribution for just that purpose, shows the gettimeofday() routine > takes on average 500 ns per call.
BTW, on current hardware the precision seems to be below the 100ns MINSTEP limit as used in the default_get_precision routine. If the ntp process wasn't interrupted the while loop might run forever. Also, the calculation doesn't work correctly if the precision is below resolution. The result is just a random value close to 100 ns. Maybe get_systime should be called multiple times before calculating the difference. -- Miroslav Lichvar _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
