RHEL7: Clock is not accurate on Intel SkyLake system, and time sync fails.

Solution Verified - Updated -


  • System clock is not accurate
  • System clock is getting faster or slower
  • ntp time sync fails in slew mode
  • tsc clocksource calibration fails
  • Absence of the following message in kernel log: tsc: Refined TSC clocksource calibration:


  • Red Hat Enterprise Linux 7.4
  • Red Hat Enterprise Linux 7.5
  • Red Hat Enterprise Linux 7.6
  • Red Hat Virtualization Host 4
  • Intel SkyLake architecture based CPUs

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