Bug 1250750 – evaluate realtime performance implications of turning on CONFIG_CGROUP_SCHED in realtime kernel

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Bug 1250750 - evaluate realtime performance implications of turning on CONFIG_CGROUP_SCHED in realtime kernel

Summary:	evaluate realtime performance implications of turning on CONFIG_CGROUP_SCHED ...

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	kernel-rt (Show other bugs)
Sub Component:
Version:	7.3
Hardware:	x86_64 Linux

Priority	high Severity high
Target Milestone:	rc
Target Release:	7.3
Assigned To:	Steven Rostedt
QA Contact:	Jiri Kastner
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:	1313485 1274397 RT7.3-Prio
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Reported:	2015-08-05 17:55 EDT by Clark Williams
Modified:	2016-11-03 15:35 EDT (History)
CC List:	4 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-11-03 15:35:42 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:2584	normal	SHIPPED_LIVE	Important: kernel-rt security, bug fix, and enhancement update	2016-11-03 08:08:49 EDT

Groups: None (edit)

Description Clark Williams 2015-08-05 17:55:01 EDT

Current RT kernel does not have CGROUP_SCHED config enabled, but may be needed down the road. Anecdotal evidence shows that that there is a 4-8us max latency penalty when testing with rteval. 

We need to determine if there is a consistent increase to max latency with CGROUP_SCHED enabled and if so, are there changes we can make to reduce the effect.

Comment 1 Clark Williams 2015-09-01 11:13:38 EDT

Pushing out to 7.3

Comment 2 Beth Uptagrafft 2015-09-02 13:17:37 EDT

Moving to 7.3

Comment 3 Clark Williams 2016-06-23 17:36:17 EDT

CONFIG_CGROUP_SCHED enabled in kernel-rt-3.10.0-382.rt56.363.el7. No significant performance loss noted in rteval runs.

Comment 7 errata-xmlrpc 2016-11-03 15:35:42 EDT

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/RHSA-2016-2584.html

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