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Oracle VM: HVM Guest VM Time/Clock Drift (Doc ID 1121445.1)

Last updated on FEBRUARY 02, 2019

Applies to:

Oracle VM - Version 2.2 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64
Linux x86
***Checked for relevance on 28-Feb-2012***
***Checked for relevance on 22-Oct-2013***
***Checked for relevance on 18-Sep-2015***


Oracle VM Hardware Virtualised (HVM) guest Virtual Machines (VMs) experience continual time/clock drift, especially under periods of high load - configuring NTP in the guest fails to correct the drift. For Windows please have a look at Doc ID 1566053.1

On Enterprise Linux 4 (EL4), the following message is reported frequently in /var/log/messages:

May 2 23:07:45 <hostname> ntpd[21238]: time reset +1235.995806 s

On Oracle Linux 5 ( OL5 ) or Oracle Linux 6 ( OL6 ), no such messages are reported, however the ntpq(8) utility denotes the drift e.g.:

# ntpq -p

remote refid st t when poll reach delay offset jitter
  <hostname> <IP> 3 u 39 128 377 0.582 -1937.1 2219.68
*LOCAL(0) .LOCL. 10 l 25 64 377 0.000 0.000 0.00


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