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List: fedora-desktop-list
Subject: Re: F21-F26 boot time comparison
From: drago01 <drago01 () gmail ! com>
Date: 2017-06-22 22:37:02
Message-ID: CAMqY-FfCa_87U6zw19L15GhkyYwQxpYJxUhhew1=1_bjDgPJ0A () mail ! gmail ! com
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On Friday, June 23, 2017, Adam Williamson <adamwill@fedoraproject.org>
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?
[Attachment #5 (text/html)]
<br><br>On Friday, June 23, 2017, Adam Williamson <<a \
href="mailto:adamwill@fedoraproject.org">adamwill@fedoraproject.org</a>> \
wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex">So, funny story: my todo list has this item, which \
I'm crossing off<br> with this mail:<br>
<br>
compare f21 / f22 / f23 boot on rust:<br>
<a href="https://blogs.gnome.org/mcatanzaro/2016/01/31/on-boot-times/#comment-120" \
target="_blank">https://blogs.gnome.org/<wbr>mcatanzaro/2016/01/31/on-boot-<wbr>times/#comment-120</a><br>
<br>
It's only been on my list since 2016-02-06, no big deal, right?<br>
However, never let it be said that I'm a liar! I *did* finally get<br>
around to doing it, plus I included F24, F25 and the current F26<br>
nightly compose as well.<br>
<br>
I tested each by installing from the x86_64 Workstation live image to<br>
my test box, which has a low-end AMD CPU (A4-7300), 8GB of RAM, and a<br>
Seagate 500GB SATA hard disk (not an SSD). I created a user during the<br>
install (so first boot wouldn't hit gnome-initial-setup before gdm),<br>
then measured the boot time from hitting 'enter' on the bootloader<br>
screen to GDM appearing fully loaded. I then measured the time it took<br>
from hitting 'enter' on the password prompt to GNOME appearing fully<br>
loaded. Then I rebooted and did the same measurements again (to see if<br>
second boot differed significantly from first boot). I did not use<br>
encryption.<br>
<br>
The results were in contrast to mcatanzaro's from that blog post. I<br>
found no significant difference in boot times across F21-F25. With only<br>
one exception, pretty much every 'boot to GDM' measurement came out at<br>
30 seconds, give or take a second or two, and every 'GDM to GNOME'<br>
measurement came out in the range of 6 to 8 seconds.<br>
<br>
The exception was the first boot of Fedora 21, which took a little over<br>
a minute. The second boot took 29 seconds, though, in line with all<br>
other tests.<br>
<br>
However, F26 does seem slightly slower than F21-F25. First boot to GDM<br>
for today's F26 nightly measured at 42 seconds. Second and third boot<br>
measured 39 seconds. GNOME load time was 8-9 seconds. Looking at the<br>
systemd-analyze info, I don't see any obvious single 'culprit', it<br>
seems more like approximately the same stuff is happening during boot,<br>
it's just all taking a bit longer.<br>
<br>
So I'm *still* not sure what's behind the very slow F23 boot Michael<br>
reported, but my test couldn't reproduce that slowness or show any<br>
significant difference between any of the releases from F21 to F25. The<br>
difference between F25 and F26 might be worth some independent re-<br>
testing and deeper analysis.<br>
</blockquote><div><br></div><div>Test with a non debug kernel? </div>
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