On Mon, Sep 05, 2011 at 06:23:23PM +0200, Tomasz Chmielewski wrote:
> >   That's because dpkg is known for using (f)sync very heavily.  btrfs
> >honours the sync request in all cases, so it's much much slower than
> >ext3, which doesn't.
> 
> Hmm, is it really the case with ext3/ext4 (ignoring fsync in some cases)?
> 
> Sounds like a bug in ext3/ext4 then.
> 
> Is it documented anywhere where ext3/ext4 would just silently ignore fsync?

They don't.  Unteil recently ext3 and reiserfs would not flush the
disk caches unless enabled by a mount option, but even that has recently
been fixed.
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