AWS 엔지니어, Linux 7.0에서 PostgreSQL 성능이 절반으로 감소했다고 보고 – 수정이 쉽지 않을 수 있음

Linux 7.0's kernel architectural changes have caused PostgreSQL performance to degrade by 50% on ARM64 systems, a regression that will soon affect many users through Ubuntu 26.04 LTS adoption. This incident underscores the critical importance of kernel-database compatibility testing, as changes in scheduling and I/O handling mechanisms can have severe, unexpected impacts on production workloads. The fact that kernel-level patches—rather than simple configuration fixes—are required demonstrates how OS updates demand careful validation across major applications.