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Bug 1360800

Summary:	realtime profile: disable timer migration
Product:	Red Hat Enterprise Linux 7	Reporter:	Jan Kurik <jkurik>
Component:	tuned	Assignee:	Jaroslav Škarvada <jskarvad>
Status:	CLOSED ERRATA	QA Contact:	Tereza Cerna <tcerna>
Severity:	unspecified	Docs Contact:
Priority:	high
Version:	7.3	CC:	jeder, jscotka, jskarvad, lcapitulino, mnavrati, tcerna, thozza
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	tuned-2.5.1-4.el7_2.5	Doc Type:	Bug Fix
Doc Text:	Previously, the realtime tuned profile that is included in the tuned-profiles-realtime package set the value of the kernel.timer_migration variable to 1. As a consequence, realtime applications could be negatively affected. This update disables the timer migration in the realtime profile.	Story Points:	---
Clone Of:	1323283	Environment:
Last Closed:	2016-09-15 08:00:22 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:	1323283
Bug Blocks:

Description Jan Kurik 2016-07-27 14:00:53 UTC

This bug has been copied from bug #1323283 and has been proposed
to be backported to 7.2 z-stream (EUS).

Comment 4 Tereza Cerna 2016-08-22 12:44:18 UTC

==================================================
Verified in:
    tuned-2.5.1-4.el7_2.5.noarch
    tuned-profiles-realtime-2.5.1-4.el7_2.5.noarch
PASS
==================================================

# grep timer /usr/lib/tuned/realtime/tuned.conf 
kernel.timer_migration = 0
# sysctl kernel.timer_migration
kernel.timer_migration = 1
# tuned-adm profile realtime
# sysctl kernel.timer_migration
kernel.timer_migration = 0

==============================================
Reproduced in:
    tuned-2.5.1-1.el7.noarch
    tuned-profiles-realtime-2.5.1-1.el7.noarch
FAIL
==============================================

# grep timer /usr/lib/tuned/realtime/tuned.conf 
# sysctl kernel.timer_migration
kernel.timer_migration = 1
# tuned-adm profile realtime
# sysctl kernel.timer_migration
kernel.timer_migration = 1

Comment 6 errata-xmlrpc 2016-09-15 08:00:22 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, 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://rhn.redhat.com/errata/RHBA-2016-1848.html