Brad Knowles wrote: > At 5:45 PM -0400 2005-09-10, Richard B. Gilbert wrote: > >> >> Some hardware and software can do this very well indeed. Others; >> e.g. Windows and Linux do not do nearly so well. > > Linux can do fine, assuming the hardware is good, and the > OS/software configuration is good. More recent versions of Linux > have tended to have some kernel issues that require rebuilding with > different options, if you want to be able to keep good time. But > once that is done, you should be okay. > > Unfortunately, Windows does not give you such an option, and > unless the server is pretty much totally unloaded and dedicated to > running nothing but NTP, you are likely to suffer some accuracy > problems.
Here is what my Windows systems synced off the Internet achieve: http://www.david-taylor.myby.co.uk/mrtg/daily_ntp.html For some reason (which I would love to sort out!), this Windows 2000 system has problems when certain Internet sites are accesses, possibly those using Flash: http://www.david-taylor.myby.co.uk/mrtg/stamsund_ntp.html This system runs a real-time data capture system with Windows NT 4. http://www.david-taylor.myby.co.uk/mrtg/bacchus_ntp.html This system is used for compiling and CPU-intensive tasks: http://www.david-taylor.myby.co.uk/mrtg/odin_ntp.html and this system runs a satellite data terminal at about 2Mb/s continuous and shares the resulting files to the network: http://www.david-taylor.myby.co.uk/mrtg/hermes_ntp.html In general, all these last three systems keep within 10-20ms of correct time, and have only been worse than that across a power glitch or across a restart of NTP. The Windows NT 4 system was restarted recently following a power glitch after being up for about a year continuous, and the CMOS had drifted quite a bit. Normally, stopping NTP would update the CMOS time, but if the power stops (and no UPS here) the CMOS will have been running at its own rate since system startup. David _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
