diff options
| author | Andrew Morton <akpm@osdl.org> | 2004-05-14 20:21:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-05-14 20:21:16 -0700 |
| commit | 19bee149edb1d1b47dfc786041f3be579aa0d0bb (patch) | |
| tree | a714c769309c0bbab7cc1fc94d5c3b6a2ca6c423 /Documentation | |
| parent | e82512d72bfd1c488590c422b2a496a636d29524 (diff) | |
| download | history-19bee149edb1d1b47dfc786041f3be579aa0d0bb.tar.gz | |
[PATCH] Update laptop mode control script with XFS_HZ=100
From: Bart Samwel <bart@samwel.tk>
The laptop mode control script incorrectly guesses XFS_HZ=1000. This is
incorrect, since the patches that made XFS use USER_HZ went into 2.6.6 as
well. This changes XFS_HZ to 100 and removes the warning from the doc about
checking XFS_HZ.
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/laptop-mode.txt | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/Documentation/laptop-mode.txt b/Documentation/laptop-mode.txt index b0ff8d661b58b7..a0c8f2ce43dbe9 100644 --- a/Documentation/laptop-mode.txt +++ b/Documentation/laptop-mode.txt @@ -69,13 +69,6 @@ Caveats * If you have your filesystems listed as type "auto" in fstab, like I did, then the control script will not recognize them as filesystems that need remounting. -* If you have XFS, make SURE that you set the XFS_HZ value in the control script - correctly, to the value of HZ of your running kernel. Laptop mode will not - work correctly if it is set too low, and you may lose data if it is set too - high. The reason for this problem is that XFS does not export its sysctl - variables in centisecs (like most other subsystems do) but in "jiffies", - which is an internal kernel measure. Once this is fixed things will get better. - * It has been reported that some versions of the mutt mail client use file access times to determine whether a folder contains new mail. If you use mutt and experience this, you must disable the noatime remounting in the control script @@ -328,10 +321,13 @@ DEF_DIRTY_RATIO=40 DEF_XFS_AGE_BUFFER=15 DEF_XFS_SYNC_INTERVAL=30 -# This must be adjusted manually to the value of HZ in the running kernel, -# until the XFS people change their external interfaces to work in centisecs -# like the rest of the external world. Unfortunately this cannot be automated. :( -XFS_HZ=1000 +# This must be adjusted manually to the value of HZ in the running kernel +# on 2.4, until the XFS people change their 2.4 external interfaces to work in +# centisecs. This can be automated, but it's a work in progress that still needs +# some fixes. On 2.6 kernels, XFS uses USER_HZ instead of HZ for external +# interfaces, and that is currently always set to 100. So you don't need to +# change this on 2.6. +XFS_HZ=100 if [ ! -e /proc/sys/vm/laptop_mode ]; then echo "Kernel is not patched with laptop_mode patch." |