Bug 1927290

Summary: cgroup: setting IOWeight doesn't work with cgroups v2
Product: Red Hat Enterprise Linux 8 Reporter: Pavel Hrdina <phrdina>
Component: systemdAssignee: Jacek Migacz <jmigacz>
Status: CLOSED ERRATA QA Contact: Frantisek Sumsal <fsumsal>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 8.3CC: dtardon, lcheng, systemd-maint-list, yisun
Target Milestone: rcKeywords: Bugfix, Triaged
Target Release: 8.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: systemd-239-48.el8 Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2021-11-09 19:55:38 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1798463, 1798464, 1934484    

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 BZ 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.

https://access.redhat.com/errata/RHBA-2021:4469