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Bug 1058098

Summary:	disable numa balancing for latency performance profile
Product:	Red Hat Enterprise Linux 7	Reporter:	Rik van Riel <riel>
Component:	tuned	Assignee:	Jaroslav Škarvada <jskarvad>
Status:	CLOSED NOTABUG	QA Contact:	qe-baseos-daemons
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.0	CC:	hhuang, jeder, jmario, jskarvad, knoel, perfbz
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-02-12 18:29:39 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:

Description Rik van Riel 2014-01-27 02:10:32 UTC

Description of problem:

The latency performance profile already disables transparent huge pagees, in order to avoid the latency associated with moving memory around into and out of huge pages.

It should also disable the numa balancing code, which relies on numa hinting page faults to figure out where a task should run, and where a task's memory should be migrated to. This can introduce undesired latency.

NUMA balancing can be disabled with the following command:

# echo NO_NUMA > /sys/kernel/debug/sched_features

Comment 5 Joe Mario 2016-05-16 11:06:38 UTC

Housekeeping update.  
Even though this BZ was closed over two years ago, I'm still on it marked as "need info".  I'm clearing that flag to stop the reminder need-info emails.

Comment 6 Joe Mario 2017-02-27 12:09:10 UTC

Housekeeping update.  
Even though this BZ was closed over three years ago, I'm still on it marked as "need info".  I'm clearing that flag to stop the reminder need-info emails.