Re: Long wait for start job

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On Sun, 2021-06-13 at 11:44 -0400, Jon LaBadie wrote:
> On Sun, Jun 13, 2021 at 09:02:49AM +0800, Ed Greshko wrote:
> > On 13/06/2021 08:41, Samuel Sieb wrote:
> > > So that gave me the clue that led to the real problem.  The
> > > service is included in the initrd and masking it on the system
> > > doesn't change that.  Even re-creating the initrd with dracut
> > > after masking didn't change anything.
> > > 
> > > And also the nm-initrd.service file is in dracut, so you would
> > > have to modify it there (not the system one) to change this.
> > 
> > FWIW, I had a VM which needed a kernel update.
> > 
> > Prior to the update it had references to systemd-udev-
> > settle.service in the logs.
> > 
> > I edited /usr/lib/dracut/modules.d/35network-manager/nm-
> > initrd.service  to have
> > 
> > DefaultDependencies=no
> > #Wants=systemd-udev-settle.service
> > #After=systemd-udev-settle.service
> > After=dracut-cmdline.service
> > 
> > And I installed the latest kernel.
> > 
> > Now....
> > 
> > [egreshko@f34x ~]$ systemctl status systemd-udev-settle.service ○
> > systemd-udev-settle.service
> >      Loaded: masked (Reason: Unit systemd-udev-settle.service is
> > masked.)
> >      Active: inactive (dead)
> > 
> > And nothing in the logs about systemd-udev-settle
> > 
> 
> Just a data point, all with the same kernel, 5.12.9-300.fc34:
> 
> My reboot times were over 2 minutes.  Systemd-analyze blame showed
> systemd-udev-settle.service taking 2+ min.  I then tried to disable
> the unit and mask it.  Next I commented the lines noted above.
> 
>     Unit state              Appears in systemd-analyze
>                               blame   critical-chain
> 
>    unchanged                    Y           Y
>    disabled&masked              Y           N
>    disabled&masked +            N           N
>     nm-initrd unit edited
> 
> That repeats what others observed.  But the reboot time change was 
> dramatic.  Here are the top lines of systemd-analyze critical-chain
> for the last two reboots above:
> 
>    graphical.target @2min 14.541s
> 
>    graphical.target @10.072s

I did the same and it has made a big difference, i.e. I no longer have
the very long delay waiting for usb-settle.

I still don't know why my external dock is being mounted at boot, but I
can live with it for now.

poc
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