Martin Burnicki wrote: > Guys, > > David J Taylor wrote: >> The Windows implementation does try to provide granularity within the >> tick, but I have no idea how the Meinberg port I'm using handles >> multi-processors. Checking. I see the routine: nt_clockstuff.c mentions >> that how to handle multi-processors is not yet decided, but that seems >> very old code (year 2000). I can't find the RDTSC instruction anywhere in >> version ntp-4.2.4p4. So I'm a bit stuck right now! > > I think a few notes are required here. > > The ntpd port for Windows does interpolate (or extrapolate?) between the > timer ticks. This has been in the NTP code base for a long time and has > _not_ been invented by Meinberg.
Right. However Pete Rosin (Eckberg) and Terje Mathisen back in May had come up with a scheme to provide additional code to improve the interpolation. That is what is not yet in the code. > While on legacy multiprocessor systems the CPU clocks (and thus the TSC) may > differ for each CPU, I'm _assuming_ that multicore CPUs are clocked by the > same source, so the TSCs should runs synchrounously. Perhaps we need definition of the difference between multi-CPU and multi-core how that effects the clock, TSC, etc. because that's not entirely clear to me. Danny _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
