Re: F21-F26 boot time comparison

[drago01]

On Friday, June 23, 2017, Adam Williamson <adamwill(a)fedoraproject.org&gt;
wrote:

>  So, funny story: my todo list has this item, which I'm crossing
> off
>  with this mail:
>
>  compare f21 / f22 / f23 boot on rust:
>  https://blogs.gnome.org/mcatanzaro/2016/01/31/on-boot-times/#comment-120
>
>  It's only been on my list since 2016-02-06, no big deal, right?
>  However, never let it be said that I'm a liar! I *did* finally get
>  around to doing it, plus I included F24, F25 and the current F26
>  nightly compose as well.
>
>  I tested each by installing from the x86_64 Workstation live image to
>  my test box, which has a low-end AMD CPU (A4-7300), 8GB of RAM, and a
>  Seagate 500GB SATA hard disk (not an SSD). I created a user during the
>  install (so first boot wouldn't hit gnome-initial-setup before gdm),
>  then measured the boot time from hitting 'enter' on the bootloader
>  screen to GDM appearing fully loaded. I then measured the time it took
>  from hitting 'enter' on the password prompt to GNOME appearing fully
>  loaded. Then I rebooted and did the same measurements again (to see if
>  second boot differed significantly from first boot). I did not use
>  encryption.
>
>  The results were in contrast to mcatanzaro's from that blog post. I
>  found no significant difference in boot times across F21-F25. With only
>  one exception, pretty much every 'boot to GDM' measurement came out at
>  30 seconds, give or take a second or two, and every 'GDM to GNOME'
>  measurement came out in the range of 6 to 8 seconds.
>
>  The exception was the first boot of Fedora 21, which took a little over
>  a minute. The second boot took 29 seconds, though, in line with all
>  other tests.
>
>  However, F26 does seem slightly slower than F21-F25. First boot to GDM
>  for today's F26 nightly measured at 42 seconds. Second and third boot
>  measured 39 seconds. GNOME load time was 8-9 seconds. Looking at the
>  systemd-analyze info, I don't see any obvious single 'culprit', it
>  seems more like approximately the same stuff is happening during boot,
>  it's just all taking a bit longer.
>
>  So I'm *still* not sure what's behind the very slow F23 boot Michael
>  reported, but my test couldn't reproduce that slowness or show any
>  significant difference between any of the releases from F21 to F25. The
>  difference between F25 and F26 might be worth some independent re-
>  testing and deeper analysis.
>  
Test with a non debug kernel?