Guys, The performance with ntpd running in a rusting Pentium hulk with several hundred clients and PPS is surprisingly good. Our rackety.udel.edu runs FreeBSD 6.1 with PPS via the parallel port. It usually shows residual offset and jitter in the order of a few microseconds. It is good enough that the daily variations in the air-conditioned machine room temperature can be measured accurately.
Measuring the PPS offset within a few hundred nanoseconds is brilliant; however, the measured latency to read the system clock from an application is in the order of a microsecond and this polluted by context switches, cache misses, timer interrupts, etc. Dave Harlan Stenn wrote: > Also: > > http://phk.freebsd.dk/soekris/pps/ > > H _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
