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#1 2020-09-05 15:53:06

zpg443
Member
Registered: 2016-12-03
Posts: 119

[SOLVED] Is there a way to improve boot times by enabling fastboot?

Enabling the fastboot (efivar FastBootOption) breaks the boot process on my UEFI machine (using grub), and this post from 2010   is the only thing I could find on the subject. The takeaway was "don't bother."

Has anyone since then successfully improved boot times by enabling fastboot, and if so, how?

Last edited by zpg443 (2020-09-05 23:32:45)

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#2 2020-09-05 17:37:05

Buddlespit
Member
From: Chesapeake, Va.
Registered: 2014-02-07
Posts: 487

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

Nope. It appears to me that my system takes 40-45 seconds to go from a reboot command to a fully loaded system, with or without fastboot. I tried it this week after replacing a motherboard


MSI B550 Bazooka, Ryzen 7 3800X, RTX 2070 SUPER, Arctis 5 usb audio, 16GB 3800 cl15 (1900 inf fab) memory, 1 nvme, 3 ssd, 1 hhd (8TB tot.)

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#3 2020-09-05 19:46:02

GaKu999
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From: US/Eastern
Registered: 2020-06-21
Posts: 373

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

I haven’t noticed a big improvement upon testing in a long time, maybe a couple of seconds but not something impressive...

Now if you feel up to the challenge you may research about kexec.

I have used it for a while for a quick warm reboot and it work quite nice, even after a little system update involving the kernel, of course you will not reload microcode that way tho...and it’s not an actual cold boot...

Is that useful for you?


My reposSome snippets

Heisenberg might have been here.

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#4 2020-09-05 22:06:33

d_fajardo
Member
Registered: 2017-07-28
Posts: 937

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

I use fastboot by enabling it in the BIOS. For me it is simply cosmetic because if I enable fastboot, the graphics driver kicks in very early which enables me to have sharp 4K resolution for my highly customized rEFInd bootloader.
Without fastboot, rEFInd complains that the 4K framebuffer is unavailable.
With fastboot, I would say fairly good. Output of systemd-analyze:

Startup finished in 7.352s (firmware) + 9.073s (loader) + 4.477s (kernel) + 4.479s (userspace) = 25.382s 
graphical.target reached after 4.479s in userspace

Difference in speed without fastboot seems negligible but the graphics kicking in early is a big plus.

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#5 2020-09-05 22:46:58

loqs
Member
Registered: 2014-03-06
Posts: 11,864

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

I think the 2010 thread is referring to a different use of fastboot that was dropped in 2.6.30  https://github.com/torvalds/linux/commi … 7bf6de47bc

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#6 2020-09-05 23:29:39

zpg443
Member
Registered: 2016-12-03
Posts: 119

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

Just finished changing bootloaders and found rEFInd works with fastboot enabled, as d_fajardo mentions, and it shaved firmware load time by almost 2 seconds.

Startup finished in 5.717s (firmware) + 1.500s (loader) + 2.044s (kernel) + 5.122s (userspace) = 14.384s 
graphical.target reached after 5.122s in userspace

Given this is a setup with KDE, 14.383s is a nice improvement.

Another improvement in boot time done before this was masking lvm2-monitor.service, lvm2-lvmetad.service, lvm2-lvmetad.socket, lvm2-lvmpolld.socket, and systemd-udev-settle.service.

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#7 2020-09-06 01:06:01

loqs
Member
Registered: 2014-03-06
Posts: 11,864

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

systemd-udev-settle.service being started means some other service required it to ensure /dev/ was populated which the other service expects.

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#8 2020-09-06 18:23:44

zpg443
Member
Registered: 2016-12-03
Posts: 119

Re: [SOLVED] Is there a way to improve boot times by enabling fastboot?

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