On 19/11/13 06:05, [email protected] wrote:
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 referenc
e 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
OptionsMiscellaneous Commands tinker - modify sacred system parameters
(dangerous) http://doc.ntp.org/4.2.6p5/miscopt.html#tinker for current stable
release 4.2.6p5tinker...... 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 suppre
ssed.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
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But I have a question,how can I set this value,I just use it in a LAN to
Synchonize the time in the LAN.So is that a stand-alone clients and servers.If
it is ,which command should I use to change this value in LINUX OS.
In /etc/ntpd.conf, or whatever your OS calls that file.
Note that ntpd was not really designed for use without a reference
clock. If you are careful, you can do so, but it is easy to create
configurations that behave badly.
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