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AP_Filesystem: LittleFS: tune for JEDEC NOR

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Decreasing metadata size from the default of a full block reduces large
pauses that cause log drops.
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Thomas Watson 2025-03-02 13:39:07 -06:00 committed by Andrew Tridgell
parent 7e90503245
commit d6bda7362f
1 changed files with 7 additions and 0 deletions
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libraries/AP_Filesystem/AP_Filesystem_FlashMemory_LittleFS.cpp
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@ -806,6 +806,13 @@ uint32_t AP_Filesystem_FlashMemory_LittleFS::find_block_size_and_count() {
fs_cfg.prog_size = page_size;
fs_cfg.block_size = flash_block_size * LFS_FLASH_BLOCKS_PER_BLOCK;
fs_cfg.block_count = flash_block_count / LFS_FLASH_BLOCKS_PER_BLOCK;
// larger metadata blocks mean less frequent compaction operations, but each
// takes longer. however, the total time spent compacting for a given file
// size still goes down with larger metadata blocks. 4096 was chosen to
// minimize both frequency and log buffer utilization.
fs_cfg.metadata_max = 4096;
fs_cfg.compact_thresh = 4096*0.88f;
#if AP_FILESYSTEM_LITTLEFS_FLASH_TYPE == AP_FILESYSTEM_FLASH_W25NXX
fs_cfg.metadata_max = page_size * 2;
fs_cfg.compact_thresh = fs_cfg.metadata_max * 0.88f;