[Bug 543617] Re: very slow filesystem I/O

[Kees Cook]

** Description changed:

  I'm seeing huge latency sometimes when unmounting ext4 partitions.
  Steps that triggered this most recently:
  
  sudo -s
  cd /tmp
  dd if=/dev/zero of=test.ext4 bs=1 count=1 seek=1G
- mkfs.ext4 test.ext4
- mkdir /mnt/test
+ mkfs.ext4 -F test.ext4
+ mkdir -p /mnt/test
  mount -o loop text.ext4 /mnt/test
  echo $(seq 65536) | (cd /mnt/test; xargs touch)
  time umount /mnt/test
  
  I'm seeing upwards of 5 minutes for the umount to finish.

-- 
very slow filesystem I/O
https://bugs.launchpad.net/bugs/543617
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