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| author | Ingo Molnar <mingo@elte.hu> | 2008-07-03 15:03:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-03 15:03:02 +0200 |
| commit | a8cac817764a494705aebd99fd51bdf6cdc28ec9 (patch) | |
| tree | 202847337f42b188755a53a7b57b502a7cdc0ad3 /Documentation/filesystems/ext4.txt | |
| parent | b4b3bd96f26586e53ab5482f1869221dd1b5ac36 (diff) | |
| parent | 543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff) | |
| download | kernel-crypto-a8cac817764a494705aebd99fd51bdf6cdc28ec9.tar.gz kernel-crypto-a8cac817764a494705aebd99fd51bdf6cdc28ec9.tar.xz kernel-crypto-a8cac817764a494705aebd99fd51bdf6cdc28ec9.zip | |
Merge commit 'v2.6.26-rc8' into x86/mce
Diffstat (limited to 'Documentation/filesystems/ext4.txt')
| -rw-r--r-- | Documentation/filesystems/ext4.txt | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt index 560f88dc709..0c5086db835 100644 --- a/Documentation/filesystems/ext4.txt +++ b/Documentation/filesystems/ext4.txt @@ -139,8 +139,16 @@ commit=nrsec (*) Ext4 can be told to sync all its data and metadata Setting it to very large values will improve performance. -barrier=1 This enables/disables barriers. barrier=0 disables - it, barrier=1 enables it. +barrier=<0|1(*)> This enables/disables the use of write barriers in + the jbd code. barrier=0 disables, barrier=1 enables. + This also requires an IO stack which can support + barriers, and if jbd gets an error on a barrier + write, it will disable again with a warning. + Write barriers enforce proper on-disk ordering + of journal commits, making volatile disk write caches + safe to use, at some performance penalty. If + your disks are battery-backed in one way or another, + disabling barriers may safely improve performance. orlov (*) This enables the new Orlov block allocator. It is enabled by default. |