Bug 1927290 - cgroup: setting IOWeight doesn't work with cgroups v2
Summary: cgroup: setting IOWeight doesn't work with cgroups v2
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: systemd
Version: 8.3
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: 8.0
Assignee: Jacek Migacz
QA Contact: Frantisek Sumsal
Depends On:
Blocks: 1798463 1798464 1934484
TreeView+ depends on / blocked
Reported: 2021-02-10 13:17 UTC by Pavel Hrdina
Modified: 2021-11-10 09:52 UTC (History)
4 users (show)

Fixed In Version: systemd-239-48.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2021-11-09 19:55:38 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Github systemd-rhel rhel-8 pull 178 0 None open (#1927290) cgroup: Also set io.bfq.weight 2021-05-24 20:34:08 UTC
Github systemd systemd pull 13335 0 None closed cgroup: Also set io.bfq.weight 2021-02-19 09:03:36 UTC
Red Hat Product Errata RHBA-2021:4469 0 None None None 2021-11-09 19:56:17 UTC

Description Pavel Hrdina 2021-02-10 13:17:11 UTC
Description of problem:

On RHEL 8 there is no io.weight interface in cgroups, we only have io.bfq.weight.
The same situation applies to cgroups v1 where we also have only blkio.bfq.weight which was fixed by EngineeringBZ 1657810.

Steps to Reproduce:

1. Boot RHEL-8 machine with systemd.unified_cgroup_hierarchy=1 on the kernel cmdline start with cgroups v2
2. run `systemctl set-property $YOUR_FAVORIT_UNIT IOWeight=123`
3. check if the value is set by running `cat /sys/fs/cgroup/$YOUR_FAVORIT_UNIT/io.bfq.weight`

Actual results:

default 100

Expected results:

default 123

Additional info:

Fixed in upstream by commit https://github.com/systemd/systemd/commit/2dbc45aea747f25cc1c3848fded2ec0062f96bcf

Comment 2 Lukáš Nykrýn 2021-05-27 12:05:52 UTC
fix merged to github master branch -> https://github.com/systemd-rhel/rhel-8/pull/178

Comment 12 errata-xmlrpc 2021-11-09 19:55:38 UTC
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 (systemd 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.


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