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[bobhurt <1460447@xxxxxxxxxxxxxxxxxx>]

I have an I7 with 12G  and SSD base drive, with UBUNTU alongside Win 8.
UBUNTU 15.04 takes 100 seconds to boot on that system.  Win 8 boots in
about 20 seconds.  14.10 booted MUCH faster.  I haven't measured the
difference, but gut feel tells me the developers did something stupid.

USER EXPERIENCE, Canonical.  TAKE A LESSON FROM APPLE .  USER EXPERIENCE
COMES FIRST.

We want fast booting and a smooth, fast, hiccup-free, gorgeous,
intuitive user interface.  No bright ideas like common core or new math
or political correctness.  Just smooth, fast, clean booting and UI.
That and staying relatively virus free will win the world's devotion.

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https://bugs.launchpad.net/bugs/1460447

Title:
  Boot slow, "scanning for btrfs filesystems" takes 100 seconds

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I installed 14.10 and used btrfs for /home.  Later, I did a clean install of 15.04, using the same /home partition.
  Ever since then, boots have been agonizingly slow; all the delay appears to be while the message
  "scanning for btrfs filesystems" is diplayed early in boot.

  The system is an i7 with one disk:

  root@i7:~# fdisk /dev/sda
  Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 4096 bytes
  I/O size (minimum/optimal): 4096 bytes / 4096 bytes
  Disklabel type: dos
  Disk identifier: 0x00007f84

  Device     Boot     Start        End    Sectors   Size Id Type
  /dev/sda1  *         2048  117186559  117184512  55.9G 83 Linux
  /dev/sda2       117186560  234373119  117186560  55.9G 83 Linux
  /dev/sda3       234375166 1953523711 1719148546 819.8G  5 Extended
  /dev/sda5       234375168  273434623   39059456  18.6G 82 Linux swap / Solaris
  /dev/sda6       273436672 1953523711 1680087040 801.1G 83 Linux

  root@i7:~# df -T | grep sd
  /dev/sda2      ext4      57542652  10103624  44492980  19% /
  /dev/sda6      btrfs    840043520 172076728 665321064  21% /home

  I'll attach a bootchart, but I suspect the btrfs delay happens before
  the bootchart starts?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-16-generic 3.19.0-16.16
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  dank       2176 F.... pulseaudio
   /dev/snd/controlC0:  dank       2176 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May 31 08:53:37 2015
  HibernationDevice: RESUME=UUID=417f2bba-dea3-496b-ad18-702d4dc6f223
  InstallationDate: Installed on 2015-05-16 (14 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
   
   lxcbr0    no wireless extensions.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic root=UUID=270a0d36-9ed9-4e58-b909-175db447838d ro quiet splash init=/lib/systemd/systemd-bootchart
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-16-generic N/A
   linux-backports-modules-3.19.0-16-generic  N/A
   linux-firmware                             1.143
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/16/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.50
  dmi.board.name: X58 Extreme
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.50:bd08/16/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX58Extreme:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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