Bug 1907924

Summary:	Enable madvdontneed in OpenShift Images
Product:	OpenShift Container Platform	Reporter:	Ryan Phillips <rphillips>
Component:	Node	Assignee:	Ryan Phillips <rphillips>
Node sub component:	Kubelet	QA Contact:	Sunil Choudhary <schoudha>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	medium
Priority:	medium	CC:	aos-bugs
Version:	4.7
Target Milestone:	---
Target Release:	4.7.0
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2021-02-24 15:44:28 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1916290

Description Ryan Phillips 2020-12-15 14:21:59 UTC

Description of problem:

Golang 1.12 changed to use MADV_FREE. MADV_FREE is somewhat faster than 
MADV_DONTNEED; however, the kernel will not try and reclaim memory in golang processes until the system is memory constrained. Cloud servers can potentially page out executable caches, which can cause IOPS throttles. Since golang 1.16  will be changing the default to MADV_DONTNEED, we are going to enable the flag by default.

https://github.com/golang/go/issues/42330

Version-Release number of selected component (if applicable):
4.7

How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

Comment 5 errata-xmlrpc 2021-02-24 15:44:28 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 (Moderate: OpenShift Container Platform 4.7.0 security, 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/RHSA-2020:5633