Linux and Windows will use the new CPUID flag (Fn0x80000026, EBX bits 31:28) value 2 to identify Low Power (LP) cores and treat them as a separate core class from existing Performance and Efficiency cores. The patch notes that boost scaling for LP cores will follow the same method AMD already uses for Efficiency cores, so schedulers can prioritize LP cores for minimal-power background and idle work while keeping Zen 6c and full Zen 6 cores for higher-performance tasks. Answered
AMD 'Zen 6 LP' cores spotted, power-efficient cores back up PS6 Portable rumorsYes. The article says the Linux patch extends topology to recognize a Low Power core class via CPUID, implying software that uses core-count or affinity masks will need to recognize the new LP class to avoid scheduling heavy workloads onto LP cores. Related article "AMD's new CPPC 'Highest Frequency' feature could improve CPU scheduling and boost behavior in Windows 11" is not required to reach this conclusion. Answered
AMD 'Zen 6 LP' cores spotted, power-efficient cores back up PS6 Portable rumors…as Nova Lake (Core Ultra Series 4). For AMD, while APX adoption is planned, the specific timeline has not been finalized, so it is currently unclear if Zen 6 will include APX…
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