Re: laptop_mode doesn't seem to work: kjournald waking up disks frequently
On Sat, Jul 17, 2004 at 03:08:08AM +1000, Tim Connors wrote:
> On Fri, 16 Jul 2004, Bartek Kania wrote:
>
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> > > I'm trying to use laptop_mode to get my disks to stay down to save
> > > energy in kernel 2.6.7. I used the script from kernel 2.6.7, put it in
> > > sbin. I also compiled the monitor in laptop_mode.txt too. When I run
> > > laptop_mode it doesn't seem to help much with the disks. What's the
> > > problem?
> > <snipp>
> > > Using the bit block that reports to dmesg I get kjournald as the process
> > > that's dirtying the node.
> >
> > What filesystems are you using?
> > Please attach the output from mount before and after running the laptop-mode
> > script.
> > When the script runs it should change the commit-time of the filesystem to
> > something large, to prevent kjournald to flush the journal every couple of
> > seconds.
>
> A while ago, I looked at the code in one of the filesystems (either ext3
> or jfs - the two fs's I use), and I wasn't convinced that the code
> correctly saved the -o remount,commitinterval value. I convinced myself it
> only got set at mount time, not at remount time - but I am very likely
> wrong, given that I am not a kernel hacker, and probably missed some
> subtlety.
>
> I have never had any luck with the laptop mode patches. Dammit.
>
It should work fine with ext3, reiserfs and xfs with kernel 2.6. With
2.4 only ext3 is functional (although it is somewhat faulty). I have
patches for 2.4 if anyone wants, didn't try to push them through yet
and I doubt they will be accepted as 2.4 doesn't take too many changes
other then bug fixes anymore.
> --
> TimC -- http://astronomy.swin.edu.au/staff/tconnors/
> A sysadmins description of life:
> Even if the underpowered inter-continental links could take it,
> you'd see a routing nightmare. BGP packets would be flying around
> in circles panicking, and any sane network administrator would lock
> him or herself in a small room and whimper until it was all over.
>
>
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