Comment 54 for bug 601299

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Ketil Malde (ketil-ii) wrote : Re: [Maverick/Natty] btrfs is extremely slow

Yes, thanks, it's now here:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/797075

It's hard to tell how many of the subscribers to this bug are affected by the same issue, or whether there are other performance issues with fsync/btrfs. I don't think btrfs was set up with 'discard' by default, so the original bug report was probably something else, and probably fixed by now.