How CXL 3.0 replaces DMA-based zero copy with cache-coherent memory pooling for in-memory databases, featuring an experimental Redis fork that maps remote DRAM under 200 ns.

By Codemia • Sep 10, 2025

5 min read

Comparing six generations of TLS acceleration — from early user-space approaches like OpenSSL CLI hacks to modern in-NIC TLS offload with Kernel TLS and QUIC.

By Codemia • Aug 26, 2025

7 min read

This post traces the decline of the Linux page cache in modern databases and storage systems. It explores the shift from mmap() and buffered I/O to O_DIRECT, driven by SSD endurance improvements, NVMe Zoned Namespaces, and user-space filesystems. Featuring case studies of MySQL, ScyllaDB, and Redpanda, it highlights why these systems bypass the kernel cache to achieve predictable p99 latencies and tighter control over I/O.

By Codemia • Aug 20, 2025

8 min read

This article explores how Non-Uniform Memory Access (NUMA) is reshaping microservice placement. It traces the evolution from early SMP kernels to modern Linux features like cgroups v2 and eBPF locality hints, and highlights Kubernetes topology-aware scheduling. Real-world data shows that aligning pods and stateful services with NUMA nodes can significantly reduce tail latency and improve throughput, making NUMA awareness as critical as network awareness in distributed system design.

By Codemia • Aug 17, 2025

5 min read