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Bug 956776

Summary:	Update rt-setup to turn off SLUB cpu_partial logic at boot
Product:	Red Hat Enterprise MRG	Reporter:	Clark Williams <williams>
Component:	realtime-utilities	Assignee:	Clark Williams <williams>
Status:	CLOSED ERRATA	QA Contact:	MRG Quality Engineering <mrgqe-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	2.3	CC:	bhu, jeder, jkastner, lgoncalv
Target Milestone:	2.3.4
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Cause: SLUB allocator uses deferred kfree() processing by default Consequence: Latency spikes when cpu_partial logic kicks in to reclaim deferred kfree() blocks Fix: run slub_cpu_partial_off script at boot to traverse /sys/kernel/slab and write zeros into any 'cpu_partial' entry found. Result: No latency spikes	Story Points:	---
Clone Of:
Clones:	957805 (view as bug list)		Environment:
Last Closed:	2013-05-20 19:10:23 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:
Bug Depends On:
Bug Blocks:	957805

Description Clark Williams 2013-04-25 15:29:56 UTC

Description of problem:

The latest version of the MRG-RT kernel uses the SLUB allocator. This has a feature called 'cpu_partial' processing which is a deferred component of kfree(). Modify rt-setup to turn off cpu_partial processing on RT by writing a zero into all cpu_partial sysfs files created by SLUB.

Comment 1 Clark Williams 2013-04-25 15:31:38 UTC

updated rt-setup-1.53-1 to run slub_cpu_partial_off script at boot

Also removed cgroup mount logic and added a require of libcgroup

Comment 8 errata-xmlrpc 2013-05-20 19:10:23 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.

http://rhn.redhat.com/errata/RHBA-2013-0828.html