Linux 7.0 Broke PostgreSQL: The Preemption Regression Explained | Hacker News
TL;DR AI
2 min readKey summary
An LKML-discussed Linux kernel preemption change caused major PostgreSQL slowdowns on a 120GB RAM system.
The regression increased lock contention, especially when huge pages were disabled, hurting database throughput.
The case highlights how kernel updates can unexpectedly impact production databases and high-memory workloads.
Commenters called for safer rollout controls, better defaults, and clearer feature gating for scheduler changes.
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