Bug 1949739
Summary: | Re-enable stalld | ||
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Product: | OpenShift Container Platform | Reporter: | OpenShift BugZilla Robot <openshift-bugzilla-robot> |
Component: | Performance Addon Operator | Assignee: | Yanir Quinn <yquinn> |
Status: | CLOSED ERRATA | QA Contact: | Niranjan Mallapadi Raghavender <mniranja> |
Severity: | urgent | Docs Contact: | |
Priority: | urgent | ||
Version: | 4.8 | CC: | aos-bugs, dcain, grajaiya, keyoung |
Target Milestone: | --- | ||
Target Release: | 4.7.z | ||
Hardware: | Unspecified | ||
OS: | Unspecified | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: |
Cause:
Stalld service was disabled by default for performance profiles due to a kernel bug in the HRTICK kernel subsystem that caused the system to hang.
Consequence:
Stalld is a required functionality for preventing the starvation of operating system threads. Not having it enabled by default impacts achievable latency.
Fix:
Kernel versions:
4.18.0-240.22.1.el8_3.x86_64
4.18.0-240.22.1.rt7.77.el8_3.x86_64
(for non real-time and real-time respectively) contain a fix for the HRTICK bug which allows us to re-enable stalld by default for all performance profiles.
Result:
Stalld functionality re-enabled by default reinstates the required latency results provided by tuning the system via the Performance addon operator.
Important Note:
All nodes kernel version must be :
4.18.0-240.22.1.el8_3.x86_64
4.18.0-240.22.1.rt7.77.el8_3.x86_64
Or higher
This means that the underlying RHCOS version needs to be updated BEFORE PAO itself.
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Story Points: | --- |
Clone Of: | Environment: | ||
Last Closed: | 2021-04-27 05:10:52 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: | 1947773 | ||
Bug Blocks: | 1949027 |
Comment 4
Niranjan Mallapadi Raghavender
2021-04-26 15:10:35 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 4.7.8 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-2021:1349 |