[Bug 2028567] Re: Do not re-compress compressed kernel modules and firmware files

[Benjamin Drung]

** Changed in: initramfs-tools (Ubuntu)
       Status: New => In Progress

** Changed in: initramfs-tools (Ubuntu)
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/2028567

Title:
  Do not re-compress compressed kernel modules and firmware files

Status in initramfs-tools package in Ubuntu:
  In Progress

Bug description:
  initramfs-tools decompresses kernel modules and firmware files before
  putting them into the initramfs. This has several drawbacks:

  * The compressed kernel modules and firmware files are probably compressed with a higher level. So recompressing them in the initramfs (default: zstd -1) will increase the size.
  * Decompressing and compressing these files during mkinitramfs will take time
  * The size of the decompressed initramfs will be bigger. That size is needed in memory during boot.

  So put compressed kernel modules and firmware files in an uncompressed
  cpio instead. To make this change have an impact the files need to be
  shipped compressed:

  * kernel modules: bug #2028568
  * firmware files: bug #1942260

  See https://lists.ubuntu.com/archives/ubuntu-
  devel/2023-July/042652.html

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