NTPD service restart and time synch Post: 302992581

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Operating Systems Linux Red Hat NTPD service restart and time synch Post 302992581 by Anjan Ganguly on Monday 27th of February 2017 01:04:35 PM

02-27-2017

Registered User

NTPD service restart and time synch

I am using ntpd service to sync our RHEL 5.9 system to synch with GPS clock.
When I change the RHEL system time more than 7 seconds than the present system time (through "Datetime" command), ntpd service does not adjust the system time to the present GPS time.But if the time is with in 7 seconds, the system time is correctly adjusted after we change the system time manually by "datetime" command.
7 second is specified in our drift file. Once I restarts the ntpd service manually, the time is again adjusted with the present GPS time. I have read many article in google and my understanding from the articles are as follows.

The ntpd service adjusts the drift (drift is specified in drift file).It assumes that systeem clock should be always synched with the GPS clock (reliable time source) unless and until ntpd
malfunctions. Can any one tell how ntpd works in comparison with W32tm service in window system?

Anjan Ganguly

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LEARN ABOUT NETBSD

hardclock

HARDCLOCK(9)						   BSD Kernel Developer's Manual					      HARDCLOCK(9)

NAME

     hardclock -- real-time timer

SYNOPSIS

     void
     hardclock(struct clockframe *frame);

DESCRIPTION

     The hardclock() function is called hz(9) times per second.  It implements the real-time system clock.  The argument frame is an opaque,
     machine-dependent structure that encapsulates the previous machine state.

     The hardclock() performs different tasks such as:

	   o   Run the current process's virtual and profile time (decrease the corresponding timers, if they are activated, and generate
	       SIGVTALRM or SIGPROF, respectively).

	   o   Increment the time-of-day, taking care of any ntpd(8) or adjtime(2) induced changes and leap seconds, as well as any necessary com-
	       pensations to keep in sync with PPS signals or external clocks, if support for this is in the kernel (see options(4)).

	   o   Schedule softclock interrupts if any callouts should be triggered (see callout(9)).

SEE ALSO

     adjtime(2), ntp_adjtime(2), signal(7), ntpd(8), callout(9), hz(9)

BSD
								  March 25, 2010							       BSD

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