This bug was fixed in the package ubuntu-drivers-common - 1:0.10.2
---------------
ubuntu-drivers-common (1:0.10.2) plucky; urgency=medium
[ Simon Chopin ]
* Replace buggy modalias map caching with simple arg passing (LP: #2092601)
-- Kuba Pawlak <kuba.paw...@canonical.com> Thu, 03 Apr 2025 10:30:34
+0200
** Changed in: ubuntu-drivers-common (Ubuntu Plucky)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2092601
Title:
ubuntu-drivers list - Extremely slow
Status in ubuntu-drivers-common package in Ubuntu:
Fix Released
Status in ubuntu-drivers-common source package in Oracular:
Confirmed
Status in ubuntu-drivers-common source package in Plucky:
Fix Released
Bug description:
[Impact]
Some basic operations on ubuntu-drivers are extremely slow (> 1mn) and
CPU-intensive, to the point that users might think it broken.
Examples of such operations are
ubuntu-drivers list
ubuntu-drivers list-oem
Both of those operations are used in subiquity. While the performance
hit there might not be too noticeable due to parallelism with other
steps of the install, it's still fairly bad.
And of course users of both the ubuntu-drivers CLI and the software-
properties panel GUI feel the impact in full.
[Proposed fix]
https://github.com/canonical/ubuntu-drivers-common/pull/116
There is an issue when trying to compute a stable key to cache the
results of a costly computation (modalias mapping), resulting in a
write-only cache.
The fix is to remove the cache entirely, expose the computation method
as a new public API, and let the caller optionally provide the
previously cached value.
Regression risks are minimal: for all the use cases listed above, the
call sites are within ubuntu-drivers-common and have been inspected
for correctness of hoisting the modalias mapping out of the loop. Any
other caller of the changed API doesn't need to be changed as the new
argument is optional. The removal of the cache is essentially a NOP
since cached values weren't retrieved anyway due to the original bug.
[Original report]
Looking for drivers is extremely slow.
Verified to exist on multiple systems.
----------------
$ time ubuntu-drivers list
nvidia-driver-560-open, (kernel modules provided by
linux-modules-nvidia-560-open-generic-hwe-24.04)
nvidia-driver-560, (kernel modules provided by
linux-modules-nvidia-560-generic-hwe-24.04)
real 1m48.680s
user 0m26.984s
sys 1m21.665s
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