An AWS engineer reported that Linux 7.0 kernel development version halves PostgreSQL performance due to changes in kernel preemption modes, reducing throughput to 51% on Graviton4 servers. The regression stems from restricting available preemption models, and while a patch was proposed to revert to PREEMPT_NONE, it may not be accepted, suggesting PostgreSQL might need adaptation instead.
Background
Linux kernel preemption models affect how tasks are scheduled, impacting database performance. PostgreSQL is a widely used open-source relational database system often deployed on cloud platforms like AWS.
- Source
- Lobsters
- Published
- Apr 9, 2026 at 01:46 AM
- Score
- 7.0 / 10