Re: GRUB really slow to boot

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From	Tim Woodall <debianuser@woodall.me.uk>
Newsgroups	linux.debian.user
Subject	Re: GRUB really slow to boot
Date	Sun, 19 Dec 2021 08:30:01 +0100
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On Sat, 18 Dec 2021, Dan Ritter wrote:

> Greg Wooledge wrote:
>> Today I rebooted my machine for the first time in quite a while, after
>> the kernel update that was released along with Debian 11.2.
>
> ...
>
>> Eventually, after a minute or two, the system booted.  Everything is
>> working normally now, post-GRUB.
>
> I upgraded three machines to that kernel, today. Two of them
> went smoothly. One of them took a ridiculously long time to
> boot.
>
> I suspect it is some interesting interaction specific to machine
> quirks and this release and/or kernel.
>

The problem, as described, is during the grub countdown. It hasn't even
committed to booting a particular OS at this point, let alone a
particular kernel version.

I don't know how grub does its timings. Does the motherboard use a
coin cell battery backup RTC and the battery is completely dead leading
to bad calibration? But I'm making wild guesses with absolutely no
knowledge of how grub works under the hood.

Check if the kernel log jumps from 1/1/70 to today as it boots. That
would point to the RTC being bad when the kernel first starts.

Thread

GRUB really slow to boot Greg Wooledge <greg@wooledge.org> - 2021-12-18 17:10 +0100
  Re: GRUB really slow to boot James Dutton <james.dutton@gmail.com> - 2021-12-18 23:30 +0100
    Re: GRUB really slow to boot Greg Wooledge <greg@wooledge.org> - 2021-12-18 23:40 +0100
      Re: GRUB really slow to boot James Dutton <james.dutton@gmail.com> - 2021-12-19 00:50 +0100
        Re: GRUB really slow to boot Greg Wooledge <greg@wooledge.org> - 2021-12-19 01:00 +0100
          Re: GRUB really slow to boot James Dutton <james.dutton@gmail.com> - 2021-12-19 14:00 +0100
            Re: GRUB really slow to boot Greg Wooledge <greg@wooledge.org> - 2021-12-19 15:20 +0100
          Re: GRUB really slow to boot Curt <curty@free.fr> - 2021-12-19 15:20 +0100
            Re: GRUB really slow to boot Greg Wooledge <greg@wooledge.org> - 2021-12-19 15:30 +0100
              Re: GRUB really slow to boot James Dutton <james.dutton@gmail.com> - 2021-12-19 15:40 +0100
      Re: GRUB really slow to boot Felix Miata <mrmazda@earthlink.net> - 2021-12-19 04:10 +0100
  Re: GRUB really slow to boot Dan Ritter <dsr@randomstring.org> - 2021-12-19 00:10 +0100
    Re: GRUB really slow to boot Tim Woodall <debianuser@woodall.me.uk> - 2021-12-19 08:30 +0100
      Re: GRUB really slow to boot Greg Wooledge <greg@wooledge.org> - 2021-12-19 15:30 +0100
        Re: GRUB really slow to boot Tim Woodall <debianuser@woodall.me.uk> - 2021-12-19 16:10 +0100
  Re: GRUB really slow to boot Brian <ad44@cityscape.co.uk> - 2021-12-19 13:10 +0100
  Re: GRUB really slow to boot Darac Marjal <mailinglist@darac.org.uk> - 2021-12-19 15:50 +0100
  Re: GRUB really slow to boot David Wright <deblis@lionunicorn.co.uk> - 2022-01-03 03:50 +0100
    Re: GRUB really slow to boot David Wright <deblis@lionunicorn.co.uk> - 2022-01-20 17:30 +0100

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