** Description changed:
+ --- initramfs-tools
+
+ [Impact]
+
+ * Initramfs-tools already supports compressed kernel modules. However,
+ in focal it does so inefficiently. It is always better to have a
+ compressed initramfs of uncommpressed kernel modules, than a compressed
+ initrd of
This bug was fixed in the package initramfs-tools - 0.140ubuntu8
---
initramfs-tools (0.140ubuntu8) jammy; urgency=medium
* Cherry-pick merge request !26 to support xz compressed
firmware. Uncompressed firmware is preffered, with a fallback to use
compressed firmware files.
** Also affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1932329
Title:
Benchmark if we can compress kernel
** Changed in: linux (Ubuntu)
Assignee: Colin Ian King (colin-king) => (unassigned)
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Dimitri John Ledkov (xnox)
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Whilst download size is larger, it is at no additional cost to our end
users, especially in the cloud. Majority of our clouds offer free
transfers inside the availability zone for which mirrors are provided.
Obviously it will increase the disk/cache storage size requirements of
our mirrors.
Our
** Tags added: patch
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https://bugs.launchpad.net/bugs/1932329
Title:
Benchmark if we can compress kernel modules
Status in linux package in Ubuntu:
In Progress
Bug
Note also the boot speed is not much different, so the I doubt we see
any noticeable boot performance wins on cloud images.
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https://bugs.launchpad.net/bugs/1932329
Title:
Note that the download size is much larger. Doesn't that impact on the
amount of data that users download (which is quite large considering the
number of kernel updates we do)?
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I like smaller install size.
In many cases we boot without initrd by default (gcp, azure, aws, kvm).
Does it then make sense to enable this for the cloud kernels?
I ponder, if i can hack initramfs-tools to append compressed kernel modules as
an uncompressed cpio archive to the initramfs, instead
Attached is the diff of the kernel to build zstd modules. This is a hack
for the moment just to get benchmarks.
** Patch added: "diff to enable ZSTD compressed kernel modules"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1932329/+attachment/5506241/+files/zstd-kernel-config.diff
--
Needed a bit of tweaking to get this benchmarked. Had to enable zstd in
kmod package and also apply a hack to the kernel package building. (See
attachment).
So, the installed compressed kernel modules are 27.1 MB compared to the
uncompressed 99.1 MB. The compressed extra modules are 103 MB
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
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