Bug 1272286

Summary:	[Doc] [Docs Audit] KSM chapter
Product:	Red Hat Enterprise Linux 7	Reporter:	Dayle Parker <dayleparker>
Component:	doc-Virtualization_Deployment_and_Administration_Guide	Assignee:	Platform Virt Docs <virt-docs>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	low	Docs Contact:
Priority:	medium
Version:	7.2	CC:	aarcange, atheurer, bgray, rhel-docs
Target Milestone:	rc	Keywords:	Documentation
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-12-20 08:40:37 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:	1201058, 1286552

Comment 6 Andrew Theurer 2015-11-17 20:36:12 UTC

There are a couple potential issues I see:

1) When disabling KSM, (⁠7.3.4. Deactivating KSM), After KSM is disabled, any memory pages that were shared -before- the deactivation are still shared.  I don't know if these's a good way to "un-share" current pages other than shutting down the VMs, or rebooting the host.  Not sure if this worth mentioning...

2) It is possible that KSM can reduce the occurrence of transparent huge pages, a feature which provides sometimes significant performance benefits (7.2.3. Huge Pages and Transparent Huge Pages).  This is probably worth mentioning, perhaps in the THP section (and refer to 7.3.4 for disabling KSM).

Comment 13 Laura Novich 2015-12-02 13:24:32 UTC

Thank you Andrea!
Laura

Comment 17 Laura Novich 2015-12-20 08:40:37 UTC

Published on December 17 version 2-24

Comment 18 Laura Novich 2015-12-20 08:43:17 UTC

Published on December 17 version 2-24