[Bug 601299] Re: maverick btrfs slow install

[Abram Hindle]

I don't think it is just btrfs. I am using XFS on top of software raid 1
in Maverick, and if I am doing any disk I/O (e.g. a big copy) dpkg will
take a very long time to unpack. Stopping the disk I/O often won't solve
the problem (maybe patience will).

I installed Brian Roger's dangerous sync free dpkg and I could install
packages with heavy disk I/O without any significant lag or latency.
dpkg Unpack would not wait for long periods with D - Uninterruptible
sleep status.

* XFS on RAID 1 
* dpkg was slow to install during high I/O
* dpkg w/o sync/fsync worked fine
* During the first installation it was also very slow.

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maverick btrfs slow install
https://bugs.launchpad.net/bugs/601299
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