Re: kmail slowdown on 2.6.* +reiserFS (v3)

[Hans Reiser]

Chris Mason wrote:

> On Sun, 2004-01-11 at 21:27, Andrew Morton wrote:
>  
>
> > Ciaby <ciaby@xxxxxxxxxxxxx> wrote:
> >    
> >
> > > I all!
> > > I've recently upgraded from 2.4 to 2.6 and I've noticed a strange thing:
> > > on the 2.4 kernel, kmail run decently (i've an old k6-200).
> > > On the 2.6 kernel, kmail slowdown and take a very long time to read a mailbox.
> > > I think something changed in the reiserFS during this time...
> > > I'm not the only experiencing this problem, read this:
> > > http://kerneltrap.org/node/view/1844
> > >      
> > A buglet in kmail was tripped up by some optimisations which went into
> > reiserfs.
> >
> > Upgrading kmail should fix it up.  Or mount the reiserfs filesystems with
> > the `nolargeio=1' mount option.
> >    
>
> Actually, we've hit other problems with v3 largeio, it can confuse rpm
> badly.  The real bug is apparently in bdb, the larger io size suggested
> by the filesystem lead bdb to corrupt its own files.  I spent some time
> neck deep in the db code but couldn't track the problem down.
>
> I seem to remember the XFS folks hitting exactly the same bug.
>
> Hans, can I talk you into having v3 export an io size of 4k to userspace
> again?  Applications that send large ios would still use Oleg's
> optimized file write paths.
>
> -chris
>
>
>
>
>  
why is it you don't want to "fix" bdb to lie to itself about the result 
of statfs?

--
Hans


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