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[Bug 1259861] Re: 5-10 second delay in kernel boot


> Try adding kernel command-line dynamic debug option:
>  ... "dyndbg=file net/ipv4/ipconfig.c +pflm" ...

I added:

    dyndbg="file net/ipv4/ipconfig.c +pflm"

to the end of the kernel command line arguments in grub and removed
quiet.  After booting I ran 'dmesg >after.txt'.  I then rebooted and
this time only removed the quiet argument, then ran 'dmesg >before.txt'.
After stripping the timestamp column I diffed before.txt and after.txt
and there was no new information (not even a line saying that the dyndbg
was enabled).

Perhaps this is because the kernel image is stripped?

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  5-10 second delay in kernel boot

Status in linux package in Ubuntu:

Bug description:
  In Trusty I see a big delay while the kernel boots that I did not see back in Precise.
  Some people have been experiencing this in Saucy too, so I don't know exactly when it started happening.
  Excerpt from dmesg:
  [    3.740100] Switched to clocksource tsc
  [   14.208118] PM: Hibernation image not present or could not be loaded.
  [   14.208885] Freeing unused kernel memory: 864K (c19ac000 - c1a84000)

  The exact messages above don't matter, they are different on different boots or on different machines.
  It even happens with e.g. 
  $ sudo kvm -m 768 -cdrom trusty-desktop-i386.iso

  My current kernel is
  Linux server 3.12.0-7-generic #15-Ubuntu SMP Sun Dec 8 23:42:09 UTC 2013 i686 i686 i686 GNU/Linux
  ...but the exact version, maybe from 3.8 to 3.12+, shouldn't matter, just run `dmesg` yourself and check if there's a big delay there.

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