Mailinglist Archive: opensuse-factory (38 mails)

[jsiebert@xxxxxxxx]

Sure... I just thought of discussing this on this list first ;-)


----- Original Nachricht ----
Von:     Adrian Schroeter <adrian@xxxxxxx>
An:      opensuse-factory@xxxxxxxxxxxx
Datum:   11.11.2005 11:27
Betreff: Re: [opensuse-factory] Suggestions for ext3 filesystem in the YAST2 installer

> 
> 
> Hi,
> 
> can you make two bugreports with "enhancement" status out of this mail 
> please ?
> 
> bye
> adrian
> 
> 
> On Friday 11 November 2005 11:13, jsiebert@xxxxxxxx wrote:
> > Hi there,
> >
> > i've been using ext3 as my favorite filesystem for all of my systems for
> > some time now because of stability reasons (had some problems with xfs,
> > reiserfs burns to many cpu cycles). Performance of ext3 in it's standard
> > configuration on openSUSE/SUSE Linux 10 is not that good compared to
> > reiserfs or xfs especially when it comes to write operations. So I've
> > investigated the issue myself and found some things that could be
> improved
> > in the future.
> >
> > 1. data=ordered vs. data=writeback on / filesystems.
> >
> > In ordered jounalling mode of ext3 data is always written to disk prior
> to
> > the metadata (journal data). This ensures data consistency in most cases.
> > However the performance of this option is not that well. In writeback
> > journalling mode the metadata might get comitted to the journal before
> the
> > data is actually written to the disk. This might lead to data corruption
> in
> > some cases (e.g. power-off before the data could be written to disk but
> the
> > journal data already has been commited). But on the other hand
> performance
> > of this option is considerably better. The YAST2 installer allows to set
> > the writeback  journalling mode but not in the / filesystem. I one
> > specifies the data=writeback option in /etc/fstab the / filesystem is
> > mounted in ordered journalling mode although. To get around this one can
> > use the tune2fs tools with the option '-o journal_data_writeback'. This
> > sets the default mount option for the filesystem with which it gets
> mounted
> > in writeback journalling mode. The same applies to the 'journal'
> > journalling mode.
> >
> > So my first suggestion for the YAST2 installer is to call' tune2fs -o
> > journal_data_writeback' for the respective device if a user selects the
> > writeback journalling mode on ext3 for the / filesystem. I've tested this
> > on three different machines without any problems.
> >
> > 2. Enable dir_index feature
> >
> > ext3 has a feature called 'dir_index' which enables faster lookups in
> large
> > filesystems by using a technique called hashed b-trees. Currently a user
> > which wants to use this feature has to manually convert the filesystem by
> > using 'tune2fs -O dir_index <device>' and 'fsck.ext3 -fD <device>' which
> > takes a long time to complete on large filesystems. This feature can also
> > be enabled by using 'mkfs.ext3 -O dir_index <device>' at filesystem
> > creation time. The YAST2 installer doesn't offer an option for this.
> >
> > So my second suggestion is to add an option to the YAST2 installer to
> > enable the dir_index feature at filesystem creation time. I've also
> tested
> > this option on three different system and noticed some speedups
> especially
> > on slower systems (my notebook).
> >
> > That's all for today ;-) Maybe these suggestions could be considered for
> > future openSUSE/SUSE Linux releases.
> >
> > Greetings,
> >
> > Machen Sie aus 14 Cent spielend bis zu 100 Euro!
> > Die neue Gaming-Area von Arcor - über 50 Onlinespiele im Angebot.
> > http://www.arcor.de/rd/emf-gaming-1
> >
> > ---------------------------------------------------------------------
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> 
> -- 
> 
> Adrian Schroeter
> SUSE Linux Products GmbH,  Maxfeldstr. 5, 90409 Nuernberg, Germany
> email: adrian@xxxxxxx
> 
> 
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> 
> 

Jens Siebert

Machen Sie aus 14 Cent spielend bis zu 100 Euro!
Die neue Gaming-Area von Arcor - über 50 Onlinespiele im Angebot.
http://www.arcor.de/rd/emf-gaming-1