在 2013年11月19日星期二UTC+8上午10时45分44秒，Brian Inglis写道： > On 2013-11-18 01:30, [email protected] wrote: > > hello : > > I had recently start a work about ntp service ,my friends and me use > > windows and linux to sync time in ntp.we could use w32time service to sync > > linux in ntp.In windows we could I found that in the registry： > > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\ > > MaxAllowedPhaseOffset may be could set the offset time between the local > > time and the server that they will be synchronize. If out of range of > > MaxAllowedPhaseOffset in seconds ,they synchronize,otherwise not. > > But I have a question that Is there a paremeter in ntp service that control > > the offset like in registry above in windows. > > W32tm is an SNTP service intended to synchronize time on > workstations in a domain to a domain controller at intervals. > > NTP service is intended to maintain accurate time on clients > and servers across the internet, where the accuracy willdepend > on your budget and effort, from <100ms with poolservers to > <1us with reference clock hardware and kernel PPS support. > > W32tm service parameters documented at > http://technet.microsoft.com/en-us/library/cc773263%28v=ws.10%29.aspx, > may be compared to options from NTP docs @ doc.ntp.org: > > e.g. > Configuration Commands and Options > Miscellaneous Commands > tinker - modify sacred system parameters (dangerous) > http://doc.ntp.org/4.2.6p5/miscopt.html#tinker > for current stable release 4.2.6p5 > > tinker... > > ... panic panic > Specifies the panic threshold in seconds with default 1000 s. > If set to zero, the panic sanity check is disabled and a clock offset > of any value will be accepted. > > ... step step > Specifies the step threshold in seconds. > The default without this command is 0.128 s. > If set to zero, step adjustments will never occur. > Note: The kernel time discipline is disabled if the step threshold is > set to zero or greater than 0.5 s. > > ... stepout stepout > Specifies the stepout threshold in seconds. > The default without this command is 900 s. > If set to zero, popcorn spikes will not be suppressed. > > > So tinker step is similar to W32tm MaxAllowedPhaseOffset except for > different service levels: > The default value for domain members is 300. > The default value for stand-alone clients and servers is 1. > and the W32tm slew requirement: > |CurrentTimeOffset| / (PhaseCorrectRate*UpdateInterval) < SystemClockRate / 2 > -- > -- > Take care. Thanks, Brian Inglis > _______________________________________________ > questions mailing list > [email protected] > http://lists.ntp.org/listinfo/questions
Thanks a lot,your analysis is very helpful for me,I have understand NTP deeper with your help ,I will try it as you said.Thank you very much. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
