According to the latest news, the Linux kernel released a system patch on November 19, repairing Intel’s 12th generation Core Alder Lake processor core scheduling failure. This series of CPUs are equipped with a P performance core and E energy efficiency core for the first time. Previously, in Linux systems, if users turn on the XMP memory overclocking function in UEFI, the Linux system will fail to allocate tasks for large and small cores, which will cause significant computer performance.
After installing the patch, the user can enter the cat /proc/sys/kernel/sched_itmt_enabled command in the terminal to query whether the ITMT scheduling function is enabled if the return value is 1, it is enabled; if the return value is 0, it is disabled or not supported. Specifically, this failure is related to Intel Turbo Boost Max technology.
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When the motherboard enables the XMP function or user-defined memory parameters, Turbo Boost Max will be automatically disabled by some motherboards. At this time, Linux will incorrectly determine all the cores of the CPU. All have the same performance. The new version of the patch is already undergoing internal testing and will soon be launched for the Linux 5.16 kernel.