Re: different oops

[Chris Mason <chris.mason@oracle.com>]

On Tue, 2008-10-07 at 13:31 +0200, Andrea Gelmini wrote:
> 2008/10/4 Chris Mason <chris.mason@oracle.com>:
> >> I'm going to try to use the cloned partition as my new /.
> >> Is there something dangerous other the ENOSPC?
> >
> > We don't have known big bugs right now, but you'll need to use another
> > FS on /boot.
> 
> I use initd, so no problem.
> Anyway, I started using btrfs for my /home (before it was Reiserfs3).
> Well, after few days of usage, the good news is about no problem like
> crash, file corruption, and so on. It also worked well with TuxOnIce,
> with a lot of suspend/resume cycle. The bad news is about load
> average. In normal session (WindowMaker, Firefox, Kopete, Skype,
> Konsole, Evince, Azureus, Evolution, K3B) I've a lot higher load
> average respect Reiserfs3. The worst is using mirrordir to backup
> /home on external device (load avg > 10).
> Is it a normal work in progress, or does it happens only to me?
> My /home is over dm-crypt, by the way.
> 

Btrfs does use more cpu than reiserfs will because of the checksumming,
and you have dm-crypt using CPU as well.  Is the system unresponsive
during the high load?

The load on linux is somewhat strange because it reflects both the
number of procs waiting on IO and the number using CPU.  Running top and
looking at the process states will help figure out which one is the
cause 'D' means IO and 'R' means CPU.

-chris