📖 ~1 min read
Table of contents
Symptom & Impact
Performance tuning settings revert, causing inconsistent throughput and latency after reboot cycles.
Environment & Reproduction
RHEL 8 server using `tuned`; reboot and run `tuned-adm active` to observe drift.
Root Cause Analysis
`tuned` service disabled, profile conflict with manual sysctl scripts, or incorrect custom profile path.
Quick Triage
Check `systemctl is-enabled tuned` and current profile state before modifying runtime values.
Step-by-Step Diagnosis
Inspect `tuned-adm list`, review `/etc/tuned/`, and correlate startup order with `journalctl -u tuned`.
Solution – Primary Fix
Enable and start `tuned`, apply target profile with `tuned-adm profile `, and remove conflicting boot-time overrides.
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Solution – Alternative Approaches
Use explicit `sysctl.d` and CPU governor management if tuned is not approved in your platform baseline.
Verification & Acceptance Criteria
Profile remains active after reboot and key performance parameters match expected baseline values.
Rollback Plan
Switch back to previous profile and re-enable prior boot scripts if new profile degrades workload behavior.
Prevention & Hardening
Capture performance profile in configuration management and assert settings post-boot with health checks.
Related Errors & Cross-Refs
Unexpected CPU governor, reverted sysctl settings, and tuned service disabled after image updates.
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
RHEL performance tuning guide and tuned profile customization documentation.
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