Public bug reported:
Symbol: MODULE_COMPRESS_ZSTD [=n]
Type : bool
= Impacts to measure and observe =
== Disk space ==
* Inspect linux-modules-* and linux-modules-extra* deb package
Installed-Size and Download-Size changes, i.e.
$ apt show linux-modules-5.8.0-53-generic linux-modules-
extra-5.8.0-53-generic | grep -e Package: -e Size:
Package: linux-modules-5.8.0-53-generic
Installed-Size: 81.5 MB
Download-Size: 15.5 MB
Package: linux-modules-extra-5.8.0-53-generic
Installed-Size: 215 MB
Download-Size: 41.5 MB
In theory, there should not be a significant change in the Download-
size. It is desired that there is a significant reduction in Installed-
Size. Modules take up about 300MB and normally one has upto three kernel
version installed, resulting in about of 1GB of disk space that one
constantly pays for.
== Boot Speed ==
In theory, boot speed may either improve or regress. It depends if disk
IO is slower than decompression speed, meaning loading compressed
modules is faster.
Also one has to observe the changes in the initrd size. zstd(zstd)
compression may result in slight growth, which shouldn't impact boot
speed too much.
= Outcomes =
If installed size savings can be achieved without regressing bootspeed
we should enable CONFIG_MODULE_COMPRESS_ZSTD=y by default.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Tags: performance zstd
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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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 description:
Symbol: MODULE_COMPRESS_ZSTD [=n]
Type : bool
= Impacts to measure and observe =
== Disk space ==
* Inspect linux-modules-* and linux-modules-extra* deb package
Installed-Size and Download-Size changes, i.e.
$ apt show linux-modules-5.8.0-53-generic linux-modules-
extra-5.8.0-53-generic | grep -e Package: -e Size:
Package: linux-modules-5.8.0-53-generic
Installed-Size: 81.5 MB
Download-Size: 15.5 MB
Package: linux-modules-extra-5.8.0-53-generic
Installed-Size: 215 MB
Download-Size: 41.5 MB
In theory, there should not be a significant change in the Download-
size. It is desired that there is a significant reduction in
Installed-Size. Modules take up about 300MB and normally one has upto
three kernel version installed, resulting in about of 1GB of disk
space that one constantly pays for.
== Boot Speed ==
In theory, boot speed may either improve or regress. It depends if
disk IO is slower than decompression speed, meaning loading compressed
modules is faster.
Also one has to observe the changes in the initrd size. zstd(zstd)
compression may result in slight growth, which shouldn't impact boot
speed too much.
= Outcomes =
If installed size savings can be achieved without regressing bootspeed
we should enable CONFIG_MODULE_COMPRESS_ZSTD=y by default.
To manage notifications about this bug go to:
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