Timekeeping issues with Xeon Scalable Platform CPUs

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Issue

Unstable timestamp counter on Intel(R) Xeon(R) Gold 6154 (and likely whole Scalable Platform Skylake family of Xeon CPUs) is causing issues with kernel tsc clocksource calibration and NTP synchronization.

Environment

Red Hat Enterprise Linux
Intel Xeon SP CPU
- reported on Intel(R) Xeon(R) Gold 6154
HPE ProLiant DL360 Gen10
- BIOS U32 09/29/2017

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