The debian bug you link to did not actually fix this. The debian devs
simply dodged the issue by adding a --force-unsafe-io flag to dpkg that
slightly reduces ( but nowhere near eliminates ) the ridiculous number
of syncs dpkg does. The idea was that debian-installer should use this
flag to speed up installations. Not only does it not go nearly far
enough during installation, but it does nothing for installing or
upgrading packages on an existing system.
** Changed in: dpkg (Ubuntu)
Status: Fix Released => Triaged
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https://bugs.launchpad.net/bugs/601299
Title:
btrfs fsync() is extremely slow
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