Confirmed with 4.8.0-14.15-generic from yakkety-proposed.
Immediately after boot the system load is also reported as ~ 250, and
then slowly goes down towards zero.
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[4.8 regression] boot has become very slow
Status in linux package in Ubuntu:
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 boot.
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
then booting with 4.4 takes 1.5s and with 4.8 19.5s (!).
Some excerps from systemd-analyze blame:
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
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
USER PID ACCESS COMMAND
/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
MachineType: LENOVO 2324CTO
PATH=(custom, no user)
ProcFB: 0 inteldrmfb
root=UUID=f86539b0-3a1b-4372-83b0-acdd029ade68 ro rootflags=subvol=@
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.version: G2ET95WW (2.55 )
dmi.board.asset.tag: Not Available
dmi.board.version: 0B98401 Pro
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.version: Not Available
dmi.product.version: ThinkPad X230
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