[Bug 787461] Re: degraded performance of update-grub 1.99-2ubuntu1 and higher

[Colin Watson]

I'm not seeing any particular reason for it while diffing the debug
output, but 'grub-probe --target=device /' (say) does seem to have
roughly halved in performance for me.  (I'm on an SSD so a difference in
the magnitude of slowdown is to be expected.)

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https://bugs.launchpad.net/bugs/787461

Title:
  degraded performance of update-grub 1.99-2ubuntu1 and higher

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: grub2

  The time to procede a "sudo update-grub" during an installation or
  deinstallation a kernel is not acceptable long. This happens since
  update to version 1.99-4ubuntu1. Additionally the CPU is running at
  100% the whole time.

  Output terminal during deinstallation:

  laura at ONEIRIC-4GDM32:~$ sudo apt-get purge linux-headers-2.6.39-2 linux-image-2.6.39-2-generic
  [sudo] password for laura: 
  Paketlisten werden gelesen... Fertig
  Abhängigkeitsbaum wird aufgebaut       
  Statusinformationen werden eingelesen... Fertig
  Die folgenden Pakete werden ENTFERNT:
    linux-headers-2.6.39-2* linux-headers-2.6.39-2-generic*
    linux-image-2.6.39-2-generic*
  0 aktualisiert, 0 neu installiert, 3 zu entfernen und 1 nicht aktualisiert.
  Nach dieser Operation werden 214 MB Plattenplatz freigegeben.
  Möchten Sie fortfahren [J/n]? 
  (Lese Datenbank ... 190179 Dateien und Verzeichnisse sind derzeit installiert.)
  Entfernen von linux-headers-2.6.39-2-generic ...
  Entfernen von linux-headers-2.6.39-2 ...
  Entfernen von linux-image-2.6.39-2-generic ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 2.6.39-2-generic /boot/vmlinuz-2.6.39-2-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 2.6.39-2-generic /boot/vmlinuz-2.6.39-2-generic
  Generating grub.cfg ...
  Found linux image: /boot/vmlinuz-2.6.39-3-generic
  Found initrd image: /boot/initrd.img-2.6.39-3-generic
  Found linux image: /boot/vmlinuz-2.6.38-8-generic
  Found initrd image: /boot/initrd.img-2.6.38-8-generic
  done
  The link /vmlinuz.old is a damaged link
  Removing symbolic link vmlinuz.old 
   you may need to re-run your boot loader[grub]
  The link /initrd.img.old is a damaged link
  Removing symbolic link initrd.img.old 
   you may need to re-run your boot loader[grub]
  Löschen der Konfigurationsdateien von linux-image-2.6.39-2-generic ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 2.6.39-2-generic /boot/vmlinuz-2.6.39-2-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 2.6.39-2-generic /boot/vmlinuz-2.6.39-2-generic
  laura at ONEIRIC-4GDM32:~$ 

  The times of the example are:

  - until "Generating grub.cfg ..." = 45 sec
   
  - time to provide first pair of kernelimages = 2:30 min

  - time  topprovide second pair of kernelimages = 1:30

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: grub-pc 1.99-4ubuntu1
  ProcVersionSignature: Ubuntu 2.6.39-3.9-generic 2.6.39
  Uname: Linux 2.6.39-3-generic i686
  Architecture: i386
  Date: Tue May 24 11:47:15 2011
  ProcEnviron:
   LANGUAGE=de_DE:en
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)