NTP time synchronization issue on SUSE Linux Enterprise Server 10 Service Pack 4 running on VMware

This document (7010716) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 10 Service Pack 4

 

Situation

On virtualized SUSE Linux Enterprise Server 10 Service Pack 4, time synchronization using Network Time Protocol daemon (ntpd) is not properly working reporting major clock drift:
 
# cat /var/lib/ntp/drift/ntp.drift
-500.000

and several frequency errors in the ntp log file:
 
# cat /var/log/ntp
[...]
9 Jul 11:06:37 ntpd[466]: frequency error -512 PPM exceeds tolerance 500 PPM
9 Jul 11:07:43 ntpd[466]: frequency error -512 PPM exceeds tolerance 500 PPM
9 Jul 11:08:46 ntpd[466]: frequency error -512 PPM exceeds tolerance 500 PPM
9 Jul 11:09:49 ntpd[466]: frequency error -512 PPM exceeds tolerance 500 PPM
[...]

The issue has been verified on systems running kernel version 2.6.16.60-0.97.1 on VMware.

Resolution

Solution:

Please update to kernel 2.6.16.60-0.99.1 or later.

Workaround:

Disable the Time Stamp Counter using the kernel parameter "notsc". In order to do this, add "notsc" to the kernel line in the file "/boot/grub/menu.lst". An example below:

kernel /boot/vmlinuz-2.6.16.60-0.97.1-default root=/dev/sda2 vga=0x314 resume=/dev/sda1 splash=silent showopts notsc

Then reboot the system and verify if the issue is solved.

Additional Information

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7010716
  • Creation Date: 31-Aug-2012
  • Modified Date:16-Mar-2021
    • SUSE Linux Enterprise Server

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