Controlling package C-states with MSR on latest CPU generations

Software Tuning, Performance Optimization & Platform Monitoring

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Controlling package C-states with MSR on latest CPU generations

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Hello all,

After checking Intel's Software Developer Manual, I'm a bit confused about how to control package C-states on Intel's 12 Gen CPUs and onward.

For old CPUs I clearly found the MSR_PKG_CST_CONFIG_CONTROL register using which developer can control package C-states, but for 6-13 Gen CPUs there are no such MSR register. On another hand there is a suspiciously similar register though, and it's named totally different: MSR_PKG_HDC_CONFIG.

Is that a novel version of MSR_PKG_CST_CONFIG_CONTROL? If I get it correct, it is, according to the description:

MSR_PKG_HDC_CONFIG allows software to configure the package Cx state that the counter MSR_PKG_HDC_DEEP_RESIDENCY monitors

Thanks!

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