RISC-V Power and Performance Management

on YouTube ↗14m

" summary

Shows concrete SBI extensions and working code for RISC V power management including SRST (ratified) enabling software power‑off and HSM (ratified) exposing ACPI LPI idle states with Linux support since 5.18. Proposes SUSP for system suspend (S2/S3) with a proof‑of‑concept that suspends a QEMU VM while YouTube playback freezes and an OpenSBI stub resumes after three seconds. Describes CPPC proposal using abstract performance levels, reference and delivered counters, PSD grouping, and OpenSBI plus Linux patches nearing submission.

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" chapters (8)

1. 0:00Introduction to RISC-V power
2. 1:50ACPI power and state concepts
3. 3:00Global and system reset states
4. 4:05Sleep and suspension states
5. 5:12Low power idle states
6. 6:20Performance states and CPPC
7. 8:18Demos and practical examples
8. 12:50Status and summary