July 2026 performance-focused enhancement for OpenXiangShan/XiangShan: introduced a configurable L1 data cache indexing scheme with a hashing-based mode to reduce evictions from sequential access patterns. The change is backward compatible via a safe fallback to the original vaddr[13:6] indexing and provides a default optimized mode (modeId=1). The feature delivered a 10.64% performance gain in the bwaves benchmark and was validated against workload patterns typical to the project. The work also included clear design notes and documentation, enabling future indexing scheme experimentation.

Monthly performance summary for OpenXiangShan development focusing on feature delivery, performance improvements, and dependency maintenance for 2026-05. Highlights include a new arbitration architecture, cache capacity enhancement, and observability improvements across the platforms.

Month: 2025-10. Focused on documentation quality and repository hygiene for OpenXiangShan/NEMU. No new features delivered this month; the main work was on README spelling/formatting corrections to improve user clarity and onboarding. All changes were captured in a single commit linked to issue #932.