** Description changed:
- kmod add zstd support
+ [Impact]
- * v27+ needs patches cherrypicked from v28
+ * To safe diskspace, upcoming devel series / hwe kernels may turn on
+ zstd kernel module compression. Kmod since impish support zstd support.
+ But in order to keep hwe kernels at parity, or allow inspecting jammy
+ modules from focal host, it would be beneficial for kmod in focal to
+ support zstd compressed modules.
- * v28+ needs new build-time deps adjusted
+ [Test Plan]
+
+ * Pick any kernel module
+
+ * Compress it with zstd: $ zstd *.ko
+
+ * Check that modinfo can read it: $ modinfo *.ko.zst
+
+ [Where problems could occur]
+
+ * kmod will gain a new dependecy on libzstd1, however it should already
+ be present, because dpkg in focal depends on libzstd1 already.
+
+ * initramfs-tools already supports compressed modules, but in focal at
+ the moment it does so in an inefficient manner (regresses bootspeed),
+ this has been improved in
+ https://launchpad.net/ubuntu/+source/initramfs-tools/0.140ubuntu8 and is
+ yet to be SRUed into Focal.
** Also affects: kmod (Ubuntu Impish)
Importance: Undecided
Status: New
** Also affects: kmod (Ubuntu Jammy)
Importance: Undecided
Status: Fix Released
** Also affects: kmod (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: kmod (Ubuntu Impish)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1933491
Title:
kmod add zstd support
Status in kmod package in Ubuntu:
Fix Released
Status in kmod source package in Focal:
New
Status in kmod source package in Impish:
Fix Released
Status in kmod source package in Jammy:
Fix Released
Bug description:
[Impact]
* To safe diskspace, upcoming devel series / hwe kernels may turn on
zstd kernel module compression. Kmod since impish support zstd
support. But in order to keep hwe kernels at parity, or allow
inspecting jammy modules from focal host, it would be beneficial for
kmod in focal to support zstd compressed modules.
[Test Plan]
* Pick any kernel module
* Compress it with zstd: $ zstd *.ko
* Check that modinfo can read it: $ modinfo *.ko.zst
[Where problems could occur]
* kmod will gain a new dependecy on libzstd1, however it should
already be present, because dpkg in focal depends on libzstd1 already.
* initramfs-tools already supports compressed modules, but in focal
at the moment it does so in an inefficient manner (regresses
bootspeed), this has been improved in
https://launchpad.net/ubuntu/+source/initramfs-tools/0.140ubuntu8 and
is yet to be SRUed into Focal.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/kmod/+bug/1933491/+subscriptions
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