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| author | Theodore Ts'o <tytso@mit.edu> | 2008-10-10 05:53:47 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-10 05:53:47 +0200 |
| commit | 240799cdf22bd789ea6852653c3b879d35ad0a6c (patch) | |
| tree | e696b60cc103f23838b5c14d8d397f692abffbc3 /Documentation/filesystems/proc.txt | |
| parent | ext4: Improve the documentation for ext4's /proc tunables (diff) | |
| download | linux-240799cdf22bd789ea6852653c3b879d35ad0a6c.tar.xz linux-240799cdf22bd789ea6852653c3b879d35ad0a6c.zip | |
ext4: Use readahead when reading an inode from the inode table
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: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'Documentation/filesystems/proc.txt')
| -rw-r--r-- | Documentation/filesystems/proc.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index d9ac9706735b..d831d24d2a6c 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -956,6 +956,9 @@ Table 1-10: Files in /proc/fs/ext4/<devname> files are packed closely together. Each large file will have its blocks allocated out of its own unique preallocation pool. +inode_readahead Tuning parameter which controls the maximum number of + inode table blocks that ext4's inode table readahead + algorithm will pre-read into the buffer cache .............................................................................. |