In few of the RHEL 6 and 7 kernels, it has been observed that the "tsc" clocksource is not available.
The same issue has also been observed on RT kernels.
Red Hat Enterprise Linux 6.9
Red Hat Enterprise Linux 7.4
Red Hat Enterprise Linux for Real-Time 7.4
Intel® X299 Chipset
Intel(R) Core(TM) i9-7980XE CPU @ 2.60GHz
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