[Bug 2065180] [NEW] performance regression in dracut-install

[Viraniac]

Public bug reported:

When compared to Ubuntu 23.10, creating intramfs files with update-
initramfs takes 2 to 5 times more time on ARM devices.

IIUC, dracut-install usage was added to initramfs-tools to speed up the
process. But now its way slower. Even running update-initramfs on jammy,
which doesn't use dracut-install, is way faster then the time taken on
Noble.

first bad commit -
https://github.com/dracutdevs/dracut/commit/3de4c7313260fb600507c9b87f780390b874c870

$ lsb_release -rd
No LSB modules are available.
Description:	Ubuntu 24.04 LTS
Release:	24.04

$ apt-cache policy dracut-install
dracut-install:
  Installed: 060+5-1ubuntu3
  Candidate: 060+5-1ubuntu3
  Version table:
 *** 060+5-1ubuntu3 500
        500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages
        100 /var/lib/dpkg/status

** Affects: dracut (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  When compared to Ubuntu 23.10, creating intramfs files with update-
- initramfs takes 2 to 5 times more time on Arm devices.
+ initramfs takes 2 to 5 times more time on ARM devices.
  
  IIUC, dracut-install usage was added to initramfs-tools to speed up the
  process. But now its way slower. Even running update-initramfs on jammy,
  which doesn't use dracut-install, is way faster then the time taken on
  Noble.
  
  first bad commit -
  https://github.com/dracutdevs/dracut/commit/3de4c7313260fb600507c9b87f780390b874c870
  
  $ lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 24.04 LTS
  Release:	24.04
  
  $ apt-cache policy dracut-install
  dracut-install:
-   Installed: 060+5-1ubuntu3
-   Candidate: 060+5-1ubuntu3
-   Version table:
-  *** 060+5-1ubuntu3 500
-         500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages
-         100 /var/lib/dpkg/status
+   Installed: 060+5-1ubuntu3
+   Candidate: 060+5-1ubuntu3
+   Version table:
+  *** 060+5-1ubuntu3 500
+         500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages
+         100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/2065180

Title:
  performance regression in dracut-install

Status in dracut package in Ubuntu:
  New

Bug description:
  When compared to Ubuntu 23.10, creating intramfs files with update-
  initramfs takes 2 to 5 times more time on ARM devices.

  IIUC, dracut-install usage was added to initramfs-tools to speed up
  the process. But now its way slower. Even running update-initramfs on
  jammy, which doesn't use dracut-install, is way faster then the time
  taken on Noble.

  first bad commit -
  https://github.com/dracutdevs/dracut/commit/3de4c7313260fb600507c9b87f780390b874c870

  $ lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 24.04 LTS
  Release:	24.04

  $ apt-cache policy dracut-install
  dracut-install:
    Installed: 060+5-1ubuntu3
    Candidate: 060+5-1ubuntu3
    Version table:
   *** 060+5-1ubuntu3 500
          500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages
          100 /var/lib/dpkg/status

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