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Why did I get different idle CPU frequency behaviors in RHEL and Windows Server 2016 with the same EPYC system and BIOS settings? RHEL always had fixed frequency.

Question asked by eddietsaitalk on Dec 13, 2017

With the same system configuration and the same BIOS setting. (CPU: EPYC 7451) I would see CPU idle frequency was shown as 2.3GHz always in RHEL 7.4 and 1.2GHz in Windows server 2016.