From 240799cdf22bd789ea6852653c3b879d35ad0a6c Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Thu, 9 Oct 2008 23:53:47 -0400 Subject: 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" --- Documentation/filesystems/ext4.txt | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation/filesystems/ext4.txt') diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt index 0d5394920a3..289057958f9 100644 --- a/Documentation/filesystems/ext4.txt +++ b/Documentation/filesystems/ext4.txt @@ -177,6 +177,11 @@ barrier=<0|1(*)> This enables/disables the use of write barriers in your disks are battery-backed in one way or another, disabling barriers may safely improve performance. +inode_readahead=n This tuning parameter controls the maximum + number of inode table blocks that ext4's inode + table readahead algorithm will pre-read into + the buffer cache. The default value is 32 blocks. + orlov (*) This enables the new Orlov block allocator. It is enabled by default. @@ -252,6 +257,7 @@ stripe=n Number of filesystem blocks that mballoc will try delalloc (*) Deferring block allocation until write-out time. nodelalloc Disable delayed allocation. Blocks are allocation when data is copied from user to page cache. + Data Mode ========= There are 3 different data modes: -- cgit v1.2.3