AMuse wrote: > Ralph: I actually feared this to be the case already and prepared to > order a pair of 4501s. > > That said, the thread about NTP stuff was relatively recent. Did > anyone build any high-accuracy NTP servers out of later model Soekris > hardware, and how? I'd like to make our remote NTP servers as > accurate as humanly possible, as the networks are pretty far apart and > the NTP time is going to be used to tune log servers. What level of accuracy do you need? I have a net4501 with the oscillator and PPS modifications, driven using the PPS and frequency output of a GPS disciplined oscillator. It keeps time to within 125 ns. I also have a standard desktop machine running NTP, receiving PPS through the serial port. It typically stays synched within 10 microseconds. I haven't done anything with the net5501, but I suspect its performance to be similar.
Once you make the jump across the network this difference in precision is unnoticeable. My other machines don't consistently choose one over the other, and on the same switch on a quiet network they typically have jitter on the order of 100-500 microseconds. If the timing requirements on your log servers is on the order of milliseconds then you really don't need to go to heroic efforts getting the NTP server down to fractions of a microsecond. Ralph _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
