[Bug 857434] Re: creates a 5 seconds delay in the boot

[Steve Langasek]

plymouth blocks the boot because you have cryptsetup installed, which
forces plymouth to be included in the initramfs.  Therefore any video
initialization delays which are normally ignored because they happen in
parallel to the rest of the system startup become critical-path here
because we won't leave the initramfs until plymouth is started *and
displaying the splash* - even though in your case the splash isn't
needed for dm-crypt prompting.

>From the attached dmesg:

[    4.425321] fbcon: inteldrmfb (fb0) is primary device
[    4.425402] Console: switching to colour frame buffer device 180x56
[    4.425441] fb0: inteldrmfb frame buffer device
[    4.425443] drm: registered panic notifier
[    5.460448] acpi device:3d: registered as cooling_device4
[    5.587831] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input5
[    5.587905] ACPI: Video Device [VID1] (multi-head: yes  rom: no  post: no)
[    5.587949] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

So the video driver loads at 5.5 seconds after boot, which is almost
exactly what we see on the bootchart; and then 'plymouth show-splash'
executes, and plymouthd waits for 5 seconds for the splash screen to
actually render before it returns control to the initramfs init.  (Note
from the boot chart that this isn't disk I/O or CPU bound - those are
mostly flat, and plymouth is waiting on something else from the kernel.
That "something else" has to be the video subsystem.)

I think this is a kernel bug.  We can and should make cryptsetup smarter
about not installing to the initramfs when not needed for the rootfs,
but given that there's some subset of users that will always need
cryptsetup, it would be best to still sort out the video delay anyway.

** Package changed: plymouth (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/857434

Title:
  creates a 5 seconds delay in the boot

Status in The Ubuntu Boot Speed Project:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Using Oneiric Beta2 on a dell latitude e6410 bootchart shows that 5
  seconds from the boot is spent waiting for plytmouth to do something,
  that seems buggy

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: plymouth 0.8.2-2ubuntu26
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic i686
  ApportVersion: 1.23-0ubuntu1
  Architecture: i386
  Date: Fri Sep 23 16:05:55 2011
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: Dell Inc. Latitude E6410
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=555ebc11-d747-44d3-af56-5e7d17851ce3 ro quiet splash vt.handoff=7 plymouth:debug
  ProcEnviron:
   LANGUAGE=fr_FR:fr:en
   PATH=(custom, user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=555ebc11-d747-44d3-af56-5e7d17851ce3 ro quiet splash vt.handoff=7 plymouth:debug
  SourcePackage: plymouth
  TextPlymouth: /lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/28/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 04373Y
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd05/28/2010:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn04373Y:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6410
  dmi.product.version: 0001
  dmi.sys.vendor: Dell Inc.

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