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Under what conditions System Clock will be adjusted by OS?

1339961Dec 30 2015 — edited Jan 18 2016

HARDWARE: HP ProLiant DL380 Generation9 Server with dual XEON E5 2630 v2 processors

OS: Orcale Soaris 11.1.10.5.0

Our application uses 100ms Timer (CLOCK_REALTIME). Generally It is working fine. One time, after one and half an hour of application running, we have noticed that the system clock adjusted by -2 sec (Minus 2 sec) by its own.  It has taken 30 sec to adjust system clock by -2 sec. During that time (ie. for 30 sec) the timer interrupt was at 106ms instead of 100ms. This behaviour is observed after 70hrs of system uptime.

Though NTP Server is availabile in our network, We have not configured NTP ie. NTP services are disabled in that machine.

Kindly let us know under what conditions system clock will be corrected/adjusted/disturbed with respect to what?

What are the services/daemons that corrects/adjusts/disturbs system clock ?

The observations are simlar to adjtime of (-2s, 0). But None of our application disturbs/sets time.

Thanks,

Graha

This post has been answered by Pascal Kreyer-Oracle on Jan 5 2016
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Locked on Feb 15 2016
Added on Dec 30 2015
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