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Linux 7.0 exFAT 顺序读取性能提升

  • 2026-02-26 00:56:25
Linux 7.0 exFAT 顺序读取性能提升

Linux 7.0 exFAT 顺序读取性能提升 ⚡

exFAT（Extended File Allocation Table）是微软推出的轻量级文件系统，专为闪存设备（U 盘、SD 卡）设计，核心是突破 FAT32 的 4GB 单文件限制 + 跨平台兼容。得益于多簇支持等改进，Linux 7.0 的开源 exFAT 驱动现在能够提供更快的顺序读取速度和更低的系统开销。
🔹 引入了多簇/连续簇支持，带来更好的顺序读取性能，尤其是在使用小簇大小的情况下。
🔹 在簇大小为 512 字节时，性能提升达到 10%。
🔹 通过缓存缓冲区头优化了连续 FAT 条目的读取，以显著减少 sb_bread() 调用。
🔹 除了性能增强，还改进了错误代码处理及其他方面。
💭 相关代码已合并至 Linux 7.0。
#exFAT #文件系统 #Linux内核

dump linux
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  1. CONNECT:[ UseTime:0.000517s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000519s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000232s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000226s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000557s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000522s ]
  8. SELECT * FROM `article` WHERE `id` = 476963 LIMIT 1 [ RunTime:0.006398s ]
  9. UPDATE `article` SET `lasttime` = 1772272966 WHERE `id` = 476963 [ RunTime:0.000633s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000481s ]
  11. SELECT * FROM `article` WHERE `id` < 476963 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008900s ]
  12. SELECT * FROM `article` WHERE `id` > 476963 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.012921s ]
  13. SELECT * FROM `article` WHERE `id` < 476963 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010309s ]
  14. SELECT * FROM `article` WHERE `id` < 476963 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008206s ]
  15. SELECT * FROM `article` WHERE `id` < 476963 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006935s ]
0.127094s