• Theodore Ts'o's avatar
    ext4: Use readahead when reading an inode from the inode table · 240799cd
    Theodore Ts'o authored
    With modern hard drives, reading 64k takes roughly the same time as
    reading a 4k block.  So request readahead for adjacent inode table
    blocks to reduce the time it takes when iterating over directories
    (especially when doing this in htree sort order) in a cold cache case.
    With this patch, the time it takes to run "git status" on a kernel
    tree after flushing the caches via "echo 3 > /proc/sys/vm/drop_caches"
    is reduced by 21%.
    Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
    240799cd
ext4.txt 11 KB