LinuxQuestions.org
Latest LQ Deal: Latest LQ Deals
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Hardware
User Name
Password
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

Notices


Reply
  Search this Thread
Old 12-18-2007, 11:38 AM   #1
awarethai@yahoo.com
LQ Newbie
 
Registered: Dec 2007
Posts: 1

Rep: Reputation: 0
the hardware time delayed from the system time


Dear All,

My server is Slackware 10.2 and installed on PC.
First, I set the hardware time and the system time to be equal?
After one week ago, the hardware time delayed from system time about 10 minutes
Why are the hardware time and the system time not equal?. How do I figure out?

TIA
Saran
 
Old 12-18-2007, 12:17 PM   #2
dkm999
Member
 
Registered: Nov 2006
Location: Seattle, WA
Distribution: Fedora
Posts: 407

Rep: Reputation: 35
If your system is running ntpd (Network Time Protocol Daemon), this could readily happen. NTP is a protocol that permits an operating system to work out the "one true time" by consulting with other machines. If your hardware clock is not precisely calibrated, its notion of time will diverge from this "one true time" that is retrieved from the 'Net.

The hardware clock is only changed when the system shuts down. On restart, the system initially takes its idea of the correct time from the hardware clock, but then, once ntpd synchronizes with other systems on the net, it begins to correct the local time of day to bring it into agreement with the consensus value.

To make a long story short, if you are running ntpd, do not worry about the divergence of the two clocks; the OS will keep more accurate time than your PC hardware, which will only be used as a backup in case the network time is not available for some reason.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
timestamps dont comply with hardware or system time leontini Linux - General 2 04-04-2007 05:20 AM
System time vs Hardware time and Daylight Savings Time Toadman Linux - General 6 03-17-2007 08:12 AM
System time vs Hardware time and Daylight Savings Time Toadman Linux - Networking 6 03-16-2007 07:14 PM
Where does RH8 daily set system time to hardware clock time smartnorman Red Hat 1 05-24-2006 02:42 PM

LinuxQuestions.org > Forums > Linux Forums > Linux - Hardware

All times are GMT -5. The time now is 02:58 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration