topic Controlling package C-states with MSR on latest CPU generations in Software Tuning, Performance Optimization & Platform Monitoring https://community.intel.com/t5/Software-Tuning-Performance/Controlling-package-C-states-with-MSR-on-latest-CPU-generations/m-p/1673856#M8522 <P>Hello all,</P><P>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.</P><P>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:&nbsp;MSR_PKG_HDC_CONFIG.</P><P>Is that a novel version of MSR_PKG_CST_CONFIG_CONTROL? If I get it correct, it is, according to the description:</P><P class="lia-indent-padding-left-30px">MSR_PKG_HDC_CONFIG allows software to configure the package Cx state that the counter MSR_PKG_HDC_DEEP_RESIDENCY monitors</P><P>Thanks!</P> Mon, 10 Mar 2025 16:49:55 GMT fuming_egg 2025-03-10T16:49:55Z Controlling package C-states with MSR on latest CPU generations https://community.intel.com/t5/Software-Tuning-Performance/Controlling-package-C-states-with-MSR-on-latest-CPU-generations/m-p/1673856#M8522 <P>Hello all,</P><P>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.</P><P>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:&nbsp;MSR_PKG_HDC_CONFIG.</P><P>Is that a novel version of MSR_PKG_CST_CONFIG_CONTROL? If I get it correct, it is, according to the description:</P><P class="lia-indent-padding-left-30px">MSR_PKG_HDC_CONFIG allows software to configure the package Cx state that the counter MSR_PKG_HDC_DEEP_RESIDENCY monitors</P><P>Thanks!</P> Mon, 10 Mar 2025 16:49:55 GMT https://community.intel.com/t5/Software-Tuning-Performance/Controlling-package-C-states-with-MSR-on-latest-CPU-generations/m-p/1673856#M8522 fuming_egg 2025-03-10T16:49:55Z