git: 6c3661df1e - main - Status/2026Q2/cppc.adoc: Add report

The branch main has been updated by olce:

URL: https://cgit.FreeBSD.org/doc/commit/?id=6c3661df1e104877e4571b5af6afed8f133b4153

commit 6c3661df1e104877e4571b5af6afed8f133b4153
Author:     Olivier Certner <[email protected]>
AuthorDate: 2026-07-07 08:23:33 +0000
Commit:     Olivier Certner <[email protected]>
CommitDate: 2026-07-14 15:19:15 +0000

    Status/2026Q2/cppc.adoc: Add report
    
    Reviewed by:    aokblast, salvadore
    Discussed with: Graham Percival <gperciva_tarsnap.com>
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D58078
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 .../en/status/report-2026-04-2026-06/cppc.adoc     | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

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+=== Collaborative Processor Performance Control (CPPC)
+
+Contact: Olivier Certner <[email protected]> +
+Contact: ShengYi Hung <[email protected]>
+
+Collaborative Processor Performance Control (CPPC) is a standard introduced by ACPI to allow the OS to manage performance and efficiency levels of CPUs thanks to an abstract performance scale in general uncorrelated to, and more fine-grained, than mere frequency levels.
+
+Work is ongoing again after another kickoff during the Halifax Hackathon at the end of June.
+
+In the works are:
+
+- New minimum, maximum and desired performance knobs for the Intel driver (man:hwpstate_intel[4]).
+- Teach man:powerd[8] about these knobs, and provide basic policies around them.
+- A knob to set the EPP (Efficiency/Performance Preference) for all CPUs at once, and probably similar ones for the minimum, maximum and desired performance values.
+- Conditional enablement of the CPPC functionality of the AMD driver (man:hwpstate_amd[4]) on ACPI's `_CPC` table presence.
+  A knob will allow users to bypass this check, and possibly also whether the CPPC features are reported by CPUID.
+- A global profile knob with predefined values (such as "Balanced", "Performance", etc.), which sets all other more fine-grained knobs.
+  Setting a fine-grained knob explicitly will switch the profile to "Custom".
+
+A number of preliminary cleanups and fixes were committed at the end of June.
+
+Sponsor: The FreeBSD Foundation