Understanding Linux Page Cache Allocation
Linux utilizes idle physical memory for disk page cache and buffer pools, delivering disk reads from RAM at memory bus speeds without consuming CPU resources.
Cloud VPS
6 min read
Aug 25, 2026
Linux Memory Caching & Drop Caches Explained: Why Free RAM is Wasted RAM
Z
Published by ZodHost Engineering Team
Executive Summary & Key Takeaways
Understand how the Linux kernel uses unused RAM for high-speed page caching and why low free RAM is normal behavior.
Ready to deploy high-performance hosting?
Get ultra-fast PCIe Gen4 NVMe storage, 99.9% uptime SLA, and free 1-click SSL.