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The irqbalance systemd service file contains:

EnvironmentFile=-/usr/lib/irqbalance/defaults.env
EnvironmentFile=-/path/to/irqbalance.env

instead of the expected:

EnvironmentFile=/etc/sysconfig/irqbalance

As a side effect, changes to the system configuration do not take effect.

*** Bug 2087750 has been marked as a duplicate of this bug. ***

Looking at new irqbalance, the irqbalance.service file is fixed:

--- old version ---

# rpm -q irqbalance
irqbalance-1.8.0-4.el9.x86_64

# cat /usr/lib/systemd/system/irqbalance.service | grep -i 'EnvironmentFile'
EnvironmentFile=-/usr/lib/irqbalance/defaults.env
EnvironmentFile=-/path/to/irqbalance.env

--- new version ---

# rpm -q irqbalance
irqbalance-1.8.0-5.el9.x86_64

# cat /usr/lib/systemd/system/irqbalance.service | grep -i 'EnvironmentFile'
EnvironmentFile=-/usr/lib/irqbalance/defaults.env
EnvironmentFile=-/etc/sysconfig/irqbalance

Setting VERIFIED.
Thanks to everyone involved!

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (irqbalance bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8328