Re: Long wait for start job

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On Fri, 2021-06-18 at 12:15 -0600, Chris Murphy wrote:
> On Fri, Jun 18, 2021, 11:10 AM Patrick O'Callaghan
> <pocallaghan@xxxxxxxxx>
> wrote:
> 
> > 
> > My problem is that one drive comes up almost instantly and the other
> > takes 30 seconds. In fact I can live with that. My real gripe is that
> > the kernel makes me wait even though the drive is not being accessed.
> > If it just wants to make the drive available, it should be able to
> > wait
> > asynchronously.
> 
> 
> Keep the hardware config the same, but boot a Fedora Live image (from
> USB
> stick or whatever). Does it still hang during boot?
> 
> The kernel shouldn't wait unless the device has put some kind of busy
> state
> on the bus shared by sysroot.
> 
> I'm suspicious that something is trying to mount it, or otherwise
> access
> it, but I haven't seen the logs.

OK, I've done that and uploaded the results to:
https://drive.google.com/drive/folders/1J3unPJIN-XNQwuwLZNsaPp7JqYH6M3YB?usp=sharing

This is using Fedora-KDE-Live-x86_64-34-1.2.iso.

There are three files:

live-blame (output of systemd-analyze blame)
live-boot.svg (output of systemd-analyze plot)
live-journal (output of journal after logging into KDE)

Clearly the 30-second delay is not happening. There is a 14-second
delay due to usb-settle, but it doesn't hold up the boot process.
(There's another delay is due to checking the MD5 checksum on the
thumbdrive before the boot proper starts, and which I interrupted).

poc
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