kernel-packages team mailing list archive

[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Ok it sounds liek we have two implementations of the ip= option, one in
the kernel and one in initramfs-tools.  As we load the majority of
network drivers from the initramfs it does not seem logical to waste
time in the kernel attempting this there when on average we do not have
the required drivers and cannot load them until the initramfs starts.
Assuming we have feature parity in userspace we should disable this.
Will investigate.

** Summary changed:

- 5-10 second delay in kernel boot
+ 5-10 second delay in kernel boot with kernel command line ip=

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https://bugs.launchpad.net/bugs/1259861

Title:
  5-10 second delay in kernel boot with kernel command line ip=

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Confirmed
Status in linux source package in Wily:
  Confirmed
Status in linux source package in Xenial:
  Confirmed

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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