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Advanced XIP Filing System

Advanced XIP Filing System. Jared Hulbert and Justin Treon. AXFS, a new GPL filing system targeted for embedded use from Intel Shows benefits of AXFS solution: RAM Usage Reduction 33%, 48MB reduced to 32MB Boot Time Reduction 18%, 6s Performance Improvements

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Advanced XIP Filing System

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  1. Advanced XIP Filing System Jared Hulbert and Justin Treon • AXFS, a new GPL filing system targeted for embedded use from Intel • Shows benefits of AXFS solution: • RAM Usage Reduction • 33%, 48MB reduced to 32MB • Boot Time Reduction • 18%, 6s • Performance Improvements • The demonstration shows that the AXFS system is actually faster then the CRAMFS system while using less RAM AXFS is a hybrid Execute-In-Place/Demand Paging filing system. AXFS enables XIP of individual pages in a rootfs. Previous application XIP patches left entire files uncompressed rather than just the pages required. This allows NOR Flash based systems to execute code from Flash rather than paging applications from Flash and decompressing them into RAM. Manufacturers are able to squeeze into the smallest RAM/FLASH combination to reduce their Bill-Of-Material while reducing boot/application launch time. Comparison of two physically identical cell phones Publicly available at http://axfs.sf.net

  2. Advanced XIP Filing System Jared Hulbert and Justin Treon Fill How we do it By using profiling tools built in AXFS we select which pages to Execute-In-Place (XIP). We trade 8 MB of Flash storage for better launch/boot time and a 16 MB RAM reduction. Solution Comparison • AXFS (Balanced XIP) • Ideal RAM/Flash usage • Cramfs (Demand Paging) • Excellent code compression, but RAM intensive • XIP Cramfs (Full XIP) • Low RAM requirement, but uses excess FLASH Fill

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