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3.4 KiB
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---
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type: types/entity.md
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entity_type: technology
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tags: [kernel, power-management, cpu, governor]
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created: 2026-07-31
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modified: 2026-08-29
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related:
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- operates-on: CPPC
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- depends-on: Linux Kernel
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sources: [Source - AMD Powermanagement CPU]
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provenance: sourced
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summary: Power-Management-Module des Linux-Kernels, die die CPU-Frequenz dynamisch nach Systemlast und Leistungsanforderung skalieren.
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---
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# Kernel PM Governors
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**Typ:** technology
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## Beschreibung
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Kernel-PM-Governoren (Power Management) sind Richtlinienmodule innerhalb des Linux-Kernels, die bestimmen, wie die CPU-Frequenzskalierung durchgeführt wird. Sie bewerten die Systemauslastung und Leistungsanforderungen, um geeignete CPU-Leistungszustände auszuwählen und dabei Leistung und Energieeffizienz auszugleichen.
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## Kerndaten
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- **Zweck:** Dynamische CPU-Frequenzskalierungsrichtlinien
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- **Status:** Aktiv
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- **Typ:** Kernel-Governor-Module
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- **Schnittstelle:** Funktioniert mit cpufreq-Treibern (amd-pstate, acpi-cpufreq)
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## Beziehungen
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, [[acpi-cpufreq]]
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- **Bewertet:** [[CPPC]]-Ziele und Hinweise (bei Verwendung von amd-pstate)
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- **Verwandt mit:** CPU-Power-Management-Subsystem
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## Details
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### Governor-Typen
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Der Linux-Kernel umfasst mehrere Governoren, wobei die folgenden am relevantesten sind:
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#### schedutil
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- **Beschreibung:** Standard-Governor in modernen Linux-Kernels
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- **Ansatz:** Verwendet Scheduler-Auslastungsdaten, um Frequenzskalierungsentscheidungen zu treffen
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- **Merkmale:**
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- Niedrige Latenz
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- Geeignet für universelle Arbeitslasten
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- Funktioniert gut mit sowohl acpi-cpufreq als auch amd-pstate
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- Kann CPPC-Leistungsziele und Hinweise bewerten, wenn amd-pstate verwendet wird
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#### ondemand
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- **Beschreibung:** Skaliert Frequenz basierend auf aktueller CPU-Auslastung
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- **Ansatz:** Erhöht die Frequenz, wenn die CPU-Auslastung steigt, senkt sie ab, wenn keine Last vorhanden ist
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- **Merkmale:**
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- Einfach und effektiv
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- Kann CPPC-Hinweise bewerten, wenn amd-pstate verwendet wird
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- Geeignet für Systeme, bei denen Leistung Priorität hat
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- Weniger aggressive Energieersparnisse als conservative
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#### Andere Governoren
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- **conservative:** Konservativere Frequenzskalierung, priorisiert Energieersparnisse
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- **powersave:** Wählt immer die niedrigste Frequenz
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- **performance:** Wählt immer die höchste Frequenz
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- **userspace:** Ermöglicht User-Space-Anwendungen, die Frequenz zu steuern
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### Governoren mit amd-pstate
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Bei Verwendung des **amd-pstate**-Treibers erhalten Governoren wie **schedutil** und **ondemand** zusätzliche Funktionen:
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- Können **CPPC-Leistungsziele** bewerten, die von der Hardware bereitgestellt werden
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- Können **CPPC-Hinweise** interpretieren, um fundiertere Entscheidungen zu treffen
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- Ermöglichen **feinkörnige Regulierung** des Systems
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- Führen zu verbesserter **Energieeffizienz** und verlängerter Batterielebensdauer auf mobilen Geräten
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### Governoren mit acpi-cpufreq
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Bei Verwendung des **acpi-cpufreq**-Treibers sind Governoren auf die Auswahl aus verfügbaren **P-States** beschränkt (normalerweise 3 Zustände für AMD):
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- P-State 0 (vollständige Leistung)
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- P-State 1 (Zwischen)
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- P-State 2 (niedrigste Leistung)
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Dies führt zu grobkörnigerer Kontrolle im Vergleich zu amd-pstate + CPPC.
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## Siehe auch
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- [[CPPC]]
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- [[Source - AMD Powermanagement CPU]]
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<!-- wikitool:links -->
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## Beziehungen
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- **operates-on:** [[CPPC]]
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- **depends-on:** [[Linux Kernel]]
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<!-- /wikitool:links -->
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