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

[Francis Moreau]

Hello,

I'm interested in optimizing my boot time on my laptop.

So I looked at the big picture first:

   $ systemd-analyze
   Startup finished in 3.994s (firmware) + 7.866s (loader) + 8.226s
(kernel) + 7.921s (userspace) = 28.007s

and noticed that the boot time spent in userspace is quite high.

I looked at the details:

   $ 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
                 ...

If I understand that correctly, NetworkManager takes more than 7 seconds
to start and seems to be the culprit.

However, I'm not sure to understand why the service following NM
(autofs) and thus multi-user.target need to wait for the network to be
available.

Specially since:

 - nothing requires a network connection in order to boot and setup my
system, including mounting /home partition

 - autofs should still be working if there's no network connection and
detect if the network becomes ready later

So my question is: in this case, is autofs wrongly waiting for the
network to be started or is NM taking too much time to start ?

Thanks.