Public bug reported:

With yakkety's recent update from linux 4.4 to 4.8 booting has become a
lot slower. It's not one service in particular, but without "quiet" and
"splash" you can now easily read every single line instead of that whole
wall of text zipping by. It now takes over 20s instead of ~10 seconds to

This is even more dramatic when factoring out the recent boot hang of
NetworkManager (bug 1622893) and disabling lightdm:

  sudo systemctl mask NetworkManager NetworkManager-wait-online lightdm

then booting with 4.4 takes 1.5s and with 4.8 19.5s (!).

Some excerps from systemd-analyze blame:

           474ms postfix@-.service
           395ms lxd-containers.service
           305ms networking.service

          4.578s postfix@-.service
          7.300s lxd-containers.service
          6.285s networking.service

I attach the full outputs of critical-chain and analyze for 4.4 and 4.8
for reference.

This is much less noticeable in the running system. There is no immediate 
feeling of sluggishness (although my system is by and large idle).

I compared the time of sbuilding colord under similar circumstances
(-j4, building on tmpfs, thus no hard disk delays; running with fully
pre-loaded apt-cacher-ng thus no random network delays), and with 4.4 it
takes 6.5 minutes and with 4.8 it takes 7.5. So that got a bit slower,
but much less dramatically than during boot, so this is either happening
when a lot of processes run in parallel, or is perhaps related to
setting up cgroups.

One thing I noticed that during sbuild in 4.8 "top" shows ridiculous
loads (~ 250) under 4.8, while it's around 4 or 5 under 4.8. But that
doesn't reflect in actual sluggishness, so this might be just an
unrelated bug.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-11-generic 4.8.0-11.12
ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
Uname: Linux 4.8.0-11-generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
 /dev/snd/pcmC0D0c:   martin     3049 F...m pulseaudio
 /dev/snd/pcmC0D0p:   martin     3049 F...m pulseaudio
 /dev/snd/controlC0:  martin     3049 F.... pulseaudio
Date: Thu Sep 22 09:42:56 2016
EcryptfsInUse: Yes
MachineType: LENOVO 2324CTO
 PATH=(custom, no user)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.8.0-11-generic.efi.signed 
root=UUID=f86539b0-3a1b-4372-83b0-acdd029ade68 ro rootflags=subvol=@ 
 linux-restricted-modules-4.8.0-11-generic N/A
 linux-backports-modules-4.8.0-11-generic  N/A
 linux-firmware                            1.161
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install) 07/09/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ET95WW (2.55 )
dmi.board.asset.tag: Not Available 2324CTO
dmi.board.vendor: LENOVO
dmi.board.version: 0B98401 Pro
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvrG2ET95WW(2.55):bd07/09/2013:svnLENOVO:pn2324CTO:pvrThinkPadX230:rvnLENOVO:rn2324CTO:rvr0B98401Pro:cvnLENOVO:ct10:cvrNotAvailable: 2324CTO
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bootspeed kernel-4.8 regression-release yakkety

** Attachment added: "systemd-analyze critical-chain/blame for 4.4 and 4.8"

** Tags added: bootspeed regression-release

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  [4.8 regression] boot has become very slow

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