The Linux kernel is undergoing a significant cleanup process as developers remove the final MMX instruction set optimizations. These legacy features, which date back to the introduction of Intel Pentium MMX processors in January 1997, are being retired to streamline the operating system codebase.
This technical housekeeping effort results in a substantial reduction of the kernel size. Developers are removing over 800 lines of legacy code and replacing them with just 12 lines. While software RAID remains functional for older systems, it will no longer utilize the MMX fast path following this update.
The MMX instruction set was widely adopted by various manufacturers during the late 1990s multimedia boom. Beyond Intel, companies including AMD, Centaur, Cyrix, Rise, and Transmeta integrated these instructions into their processors. The technology was eventually superseded by newer standards like SSE and SSE2.
