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dpkg 1.15.6 is slow as hell

The decision to immediately fsync() all files written to disk has a
detrimental influence on dpkg's performance, especially when unpacking
large packages.  On my system which has a 2.5" hard disk with an ext4
filesystem, installing emacs23-common (containing 2123 files) with a hot
cache takes 76 seconds, almost all of which is spent during unpacking.
With dpkg, it takes 5.3 seconds, including processing three
triggers.  This is really painful. :-(


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