I filed Bug #2057822: "Removing irqbalance disables power button on
Raspberry Pi 5" (https://bugs.launchpad.net/ubuntu/+source/ubuntu-
meta/+bug/2057822).
Thanks.
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David, please open a new bug against ubuntu-meta about that issue.
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https://bugs.launchpad.net/bugs/1833322
Title:
Please consider no more having irqbalance enabled
Since I saw that irqbalance was not going to be installed by default in
Noble I removed it from my Raspberry Pi 5 running Mantic, and as a
result the power button stopped working. The error is:
kernel: gpio-keys pwr_button: Unable to get irq number for GPIO 0, error
-6
Reinstalling irqbalance
** Changed in: ubuntu-z-systems
Status: Opinion => Fix Released
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Title:
Please consider no more having irqbalance
I've added a section to the release notes summing this up and linking
back here and to some of the past links.
** Changed in: ubuntu-release-notes
Status: In Progress => Fix Released
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This bug was fixed in the package ubuntu-meta - 1.532
---
ubuntu-meta (1.532) noble; urgency=medium
* Refreshed dependencies
* Removed irqbalance from standard-recommends (LP: #1833322)
-- Christian Ehrhardt Thu, 22 Feb
2024 12:37:15 +0100
** Changed in: ubuntu-meta (Ubuntu)
FYI: updated ubuntu-meta, now in noble-proposed as version 1.532
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Title:
Please consider no more having irqbalance enabled
FYI: Seed change landed
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Title:
Please consider no more having irqbalance enabled by default (per
image/use-case/TBD)
Steve was so kind reviewing and approving my proposal.
Doing that now is also helpful as it should make sure it still has quite some
exposure and thereby chances for people to report issues (vs if we'd land it
much later like after beta freeze).
Changes will:
- change the seeds in regard to
My personal thoughts are that the proposal is nothing if not carefully
considered...! Lots of great discussion and input. There is plenty of
opportunity for people to provide feedback on whether or how the change
impacts them in ways we were unable to foresee.
On Tue, Feb 20, 2024 at 11:31 PM
While there was sadly neither enough time not enough resources to do all
the deep dive analysis that could have been done, we succeeded by
reaching out to many more parties and got their input as well. Thank you
all!
Since Noble feature freeze is coming we need to make a call either way.
I
** Merge proposal linked:
https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+merge/460904
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Title:
Please
Interesting, that is more towards irqbalance than I heard so far.
thanks Fabio!
So we might end up needing to go like "Generally disabled except this
list of places [...] where it stays enabled".
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Sorry for the late feedback, but sharing here:
AWS docs regarding best practices regarding cpu-starvation [1] do not
recommend disabling the irqbalance service. Quoting the doc:
> "Note: we do not recommend disabling irqbalance service. ENA driver
doesn’t provide affinity hints, and if device
Hey Henry, thanks for chiming in and I agree in general that tech moved on.
Myself and others said similar before, thanks for adding more details and
voices - that is what such a discussion is about.
> they just don't go ping-ponging around between
In particular on this aspect, so much has
[Please ignore comment#35 - this was caused by a BZ-to-LP-bridge issue
...]
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Title:
Please consider no more having
Proxying a few comments I've heard from cloud partners about uses:
There are some big companies, particularly in the streaming media and
encoding business heavily using irqbalance. _however_ our consideration
is about irqbalance enabled by default. They do heavy tuning, not
running stock values.
Just for perspective on this, I've used Linux since about 1993
(originally Slackware, then Gentoo, then Ubuntu) and recall manually
adding irqtune to my system in the distant past.
When irqtune was originally developed, it was common to run XT-PIC, all
interrupts were went to CPU 0, period. When
Thanks for the ping.. I have had no feedback from NVIDIA (DGX,
Bluefield, Tegra), and I have informed them that from now on, we
consider that 'no feedback' meant they are ok with the change.
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FYI, multiple parties and people promised me more input, but so far none
has arrived over the last weeks.
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Title:
Please
Since the discussion is no more only covering Desktop I updated the
title (thanks Seb128 for suggesting)
** Summary changed:
- Consider removing irqbalance from default install on desktop images
+ Please consider no more having irqbalance enabled by default (per
image/use-case/TBD)
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