Linux main creator Linus Torvalds merged several important patches in the kernel for Intel CPUs earlier today, which are related to the performance state (P-State) on Linux. One of them includes a fix to the recently discovered Intel Turbo Boost Max Technology (ITMT) issue that prevented the Alder Lake processor from performing its maximum performance when overclocked.
This error is easily reminiscent of the recent Ryzen CPPC2 error on Windows 11 because it is related to task processing and the fastest kernel priority. The new merged patch contains fixes to three issues, including a fix for ITMT issues with the help of hardware-controlled P-States (HWP). Other problems are related to hibernation.
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The following is the patch description given by the Linux kernel team, and the ITMT error has been bolded:
- This improvement solves three problems in the intel_pstate driver and fixes two problems related to hibernation.
- Make intel_pstate work correctly on Ice Lake server systems with out-of-band performance control enabled (Adamos Ttofari).
- Fix the EPP processing of intel_pstate when the CPU is offline and online in active mode (Rafael Wysocki).
- Enable intel_pstate to support ITMT (Srinivas Pandruvada) on asymmetric systems with overclocking enabled.
- Fix hibernation image saving (Evan Green) when using the userspace interface based on snapshot special device files.
- Make the hibernation code release the snapshot block device in the same mode as when the snapshot block device was taken (Thomas Zeitlhofer).
This is not the only Linux bug that Alder Lake has. There is also an existing cluster scheduler function problem that persists. Compared with the previous kernel, it has caused a considerable performance degradation on Linux 5.16. There have been multiple performance tests before. The comparison results also show that the optimized Windows 11 is the most suitable operating system for Intel’s 12th-generation Core processors.