[systemd-devel] Help needed for optimizing my boot time

[Andrei Borzenkov]

On Thu, Jun 11, 2015 at 3:10 PM, Francis Moreau <francis.moro at gmail.com> wrote:
> On 06/11/2015 01:40 PM, Andrei Borzenkov wrote:
>> On Thu, Jun 11, 2015 at 2:26 PM, Francis Moreau <francis.moro at gmail.com> wrote:
>>>>>
>>>>>    $ systemd-analyze critical-chain
>>>>>
>>>>>    graphical.target @7.921s
>>>>>      multi-user.target @7.921s
>>>>>        autofs.service @7.787s +132ms
>>>>>          network-online.target @7.786s
>>>>>            network.target @7.786s
>>>>>              NetworkManager.service @675ms +184ms
>>>>>                basic.target @674ms
>>>>>                  ...
>>>>>
>> ...
>>>> Is NetworkManager-wait-online.service enabled and active?
>>>>
>>>
>>> It seems it's enabled but no more active:
>>>
>>> $ systemctl status NetworkManager-wait-online.service
>>> ● NetworkManager-wait-online.service - Network Manager Wait Online
>>>    Loaded: loaded
>>> (/usr/lib/systemd/system/NetworkManager-wait-online.service; disabled;
>>> vendor preset: disabled)
>>>    Active: inactive (dead) since Thu 2015-06-11 11:54:37 CEST; 1h 4min ago
>>>   Process: 583 ExecStart=/usr/bin/nm-online -s -q --timeout=30
>>> (code=exited, status=0/SUCCESS)
>>>  Main PID: 583 (code=exited, status=0/SUCCESS)
>>>
>>> Jun 11 11:54:30 cyclone systemd[1]: Starting Network Manager Wait Online...
>>> Jun 11 11:54:37 cyclone systemd[1]: Started Network Manager Wait Online.
>>>
>>> This seems correct to me, doesn't it ?
>>>
>>
>> Actually it says "disabled" which makes me wonder why it run. But this
>> is the service that is likely responsible for long time you observe.
>
> I think it runs because of this:
>
> $ ls /usr/lib/systemd/system/network-online.target.wants/
> NetworkManager-wait-online.service
>
> BTW, why isn't it showed by 'systemd-analyze critical-chain' ?
>

My best guess is that it has no direct dependency on NetworkManager so
it is not counted as part of "chain". You could try adding

After=NetworkManager.service

to see if it changes anything in systemd-analyze output.

>> If disabling it does ot help, you can try masking it (systemctl mask)
>> for a test.
>
> Actually, I'm still not sure why autofs.service is waiting for
> network-online.target to be activated, IOW why this service has
> 'After=network-online.target'.
>

You can discuss it on autofs list; systemd is just a messenger here :)