🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: 8.5 8.6 8.7 8.8 8.9 8.10

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

Performance tuning settings revert after reboot, causing latency spikes or throughput drops. Capacity planning assumptions become unreliable.

Environment & Reproduction

Appears on hosts where tuned was manually configured but not properly enabled. Reboot resets kernel and power settings to defaults.

Root Cause Analysis

tuned service is disabled, profile was not persisted, or conflicting tools overwrite sysctl and governor values at startup.

Quick Triage

Run tuned-adm active and systemctl status tuned, then inspect journalctl -u tuned for startup or profile load errors.

Step-by-Step Diagnosis

Verify profile files, startup ordering, and conflicting performance agents. Compare runtime sysctl and CPU governor state against expected profile output.

Illustrative mockup for rhel-8 — tuned-adm-active-profile
Checking active tuned profile — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Set profile with tuned-adm profile , enable tuned via systemctl enable –now tuned, and remove conflicting startup scripts. Reboot to confirm persistence.

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Illustrative mockup for rhel-8 — systemctl-enable-tuned
Ensuring tuned service is enabled at boot — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

For strict environments, codify settings through configuration management and reserve tuned for observability-driven profile tuning only.

Verification & Acceptance Criteria

Active profile remains correct across reboot and measured performance returns to baseline targets.

Rollback Plan

Reapply previous profile or disable tuned temporarily if workload behavior regresses.

Prevention & Hardening

Include tuned status checks in boot validation and maintain approved profile catalog per workload class.

Performance anomalies may also result from CPU throttling, NUMA misalignment, or storage queue saturation.

Related tutorial: View the step-by-step tutorial for rhel-8.

View all rhel-8 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See Red Hat tuned and performance tuning guides for RHEL 8 best practices.

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