Bug 1907929

Summary: Enable madvdontneed in OpenShift System Components Part 2
Product: OpenShift Container Platform Reporter: Ryan Phillips <rphillips>
Component: NodeAssignee: Ryan Phillips <rphillips>
Node sub component: Kubelet QA Contact: Sunil Choudhary <schoudha>
Status: CLOSED ERRATA Docs Contact:
Severity: medium    
Priority: medium CC: aos-bugs, cshepher, nagrawal, tsweeney
Version: 4.7Keywords: Reopened, UpcomingSprint
Target Milestone: ---   
Target Release: 4.7.0   
Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2021-02-24 15:44:28 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 1926944    

Description Ryan Phillips 2020-12-15 14:27:08 UTC 
Description of problem:

This BZ is for the system components within the MCO (Kubelet and Crio).

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

Part 1: https://bugzilla.redhat.com/show_bug.cgi?id=1907924

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


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Additional info:
Comment 4 Ryan Phillips 2021-02-09 20:38:32 UTC 
*** Bug 1916501 has been marked as a duplicate of this bug. ***
Comment 7 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