Cache Aware Scheduling Shows Nice Wins For AMD Zen 5 On PostgreSQL, Valkey, Network Performance

Cache Aware Scheduling (CAS), a long-in-development Linux kernel feature, is expected to land in Linux 7.2. Benchmarks on an AMD Ryzen Threadripper 9980X (Zen 5) running Ubuntu 26.04 show performance improvements for workloads including PostgreSQL, Valkey, and network performance. CAS improves performance on modern multi-cache-domain CPUs by colocating tasks sharing data within the same last-level cache (LLC) domain, reducing cache misses and bouncing.