How Linux 7.0 Broke PostgreSQL: The Preemption Regression Explained

☕ Welcome to The Coder Cafe! On April 3, 2026, Salvatore Dipietro, an engineer at AWS, posted a patch to the Linux kernel mailing list. The reason: on a 96-vCPU Graviton4 machine running Linux 7.0, PostgreSQL throughput had dropped to roughly half of what it produced on Linux 6.x. In this post, we will trace what changed in Linux 7.0, how PostgreSQL manages memory, and what role memory pages play

[nguyen-oi]

Linux 7.0でPREEMPT_NONE廃止がPostgreSQLにトドメ刺したのか。Huge Pagesが生命線すぎて笑う

[lizy]

PageFault時に割り込まれるようになったことによる速度低下、PageSizeを大きくするとFaultが減って性能劣化は解決？するらしい