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Bug 1960386

Summary:	The stalld service has a higher scheduler priority than ksoftirq and rcu{b, c} threads
Product:	OpenShift Container Platform	Reporter:	Yanir Quinn <yquinn>
Component:	Performance Addon Operator	Assignee:	Yanir Quinn <yquinn>
Status:	CLOSED ERRATA	QA Contact:	Gowrishankar Rajaiyan <grajaiya>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	4.6	CC:	alukiano, aos-bugs, grajaiya, mniranja, msivak, shajmakh
Target Milestone:	---
Target Release:	4.6.z
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1905492	Environment:
Last Closed:	2021-06-22 11:22:12 UTC	Type:	---
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:	1905492, 1985371
Bug Blocks:

Comment 1 Shereen Haj Makhoul 2021-06-17 15:39:45 UTC

Verifying the defect on 4.6.34:

[root@ocp-edge41 performance]# oc version
Client Version: 4.6.34
Server Version: 4.6.34
Kubernetes Version: v1.19.0+c3e2e69

PAO version is 4.6.4-4

I ran these commands to validate the result :
oc get tuned -A
oc project openshift-cluster-node-tuning-operator
oc get tuned
oc describe tuned/openshift-node-performance-performance

and on the last command got the following output :

.
.
.
[service]
service.stalld=start,enable


[vm]
transparent_hugepages=never                   #  network-latency

[scheduler]
group.ksoftirqd=0:f:11:*:ksoftirqd.*
group.rcuc=0:f:11:*:rcuc.*

Comment 4 errata-xmlrpc 2021-06-22 11:22:12 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 (OpenShift Container Platform 4.6.35 low-latency extras 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-2021:2482