on late-fs
    # boot time fs tune
    write /sys/block/mmcblk2/queue/iostats 0
    write /sys/block/mmcblk2/queue/read_ahead_kb 2048
    write /sys/block/mmcblk2/queue/nr_requests 256
    write /sys/block/dm-0/queue/read_ahead_kb 2048
    write /sys/block/dm-1/queue/read_ahead_kb 2048
    write /sys/block/dm-2/queue/read_ahead_kb 2048
    write /sys/block/dm-3/queue/read_ahead_kb 2048


on property:sys.boot_completed=1
    # end boot time fs tune
    write /sys/block/mmcblk2/queue/read_ahead_kb 128
    write /sys/block/mmcblk2/queue/nr_requests 128
    write /sys/block/dm-0/queue/read_ahead_kb 128
    write /sys/block/dm-1/queue/read_ahead_kb 128
    write /sys/block/dm-2/queue/read_ahead_kb 128
    write /sys/block/dm-3/queue/read_ahead_kb 128
    write /sys/block/mmcblk2/queue/iostats 1