OK, we have done thorough benchmarking of the two patches. In summary, they both seem to provide exactly the same performance improvements. My initial worry that Rafael's patch didn't deliver the same performance improvements was unfounded. The following are the single-core and multi-core scores from running Geekbench 5 multiple times on a Carbon Systems Iridium 16 system. The first batch of tests was done with an Ubuntu kernel built with with my V3 proposed patch, while the second batch was done with a kernel build with Rafael's proposed patch. Links to the Geekbench 5 reports can be shared if needed. _OSC CPPC bit ignore patch (written by Aaron Rainbolt): Kernel parameter 'ignore_osc_cppc_bit' set in '/etc/default/grub.d/kfocus.cfg'. '/sys/devices/system/cpu/cpu*/acpi_cppc' and '/proc/sys/kernel/sched_itmt_enabled' both present | Run | Single | Multi | | --- | ------ | ------ | | 01 | 1874 | 10475 | | 02 | 1831 | 10132 | | 03 | 1858 | 10348 | | 04 | 1848 | 10370 | | 05 | 1831 | 10413 | | --- | ------ | ------ | | AVG | 1848 | 10348 | intel_pstate CPPC override patch (written by Rafael Wysocki): No special kernel parameters set. '/sys/devices/system/cpu/cpu*/acpi_cppc' ABSENT, '/proc/sys/kernel/sched_itmt_enabled' present | Run | Single | Multi | | --- | ------ | ------ | | 01 | 1820 | 10310 | | 02 | 1870 | 10303 | | 03 | 1867 | 10420 | | 04 | 1844 | 10283 | | 05 | 1835 | 10451 | | --- | ------ | ------ | | AVG | 1847 | 10353 |
