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Bug 865505

Summary:	RFE: CPU definition should add ',+x2apic' regardless of the CPU model that the VM is using
Product:	Red Hat OpenStack	Reporter:	Yaniv Kaul <ykaul>
Component:	openstack-nova	Assignee:	Daniel Berrangé <berrange>
Status:	CLOSED WONTFIX	QA Contact:	yeylon <yeylon>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	1.0 (Essex)	CC:	apevec, bsettle, markmc, rbalakri, sgordon, srevivo
Target Milestone:	ga	Keywords:	FutureFeature
Target Release:	10.0 (Newton)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-04-08 19:55:24 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:	870484, 956468, 1059007
Bug Blocks:

Description Yaniv Kaul 2012-10-11 15:39:19 UTC

Description of problem:
x2apic can provide some performance benefit (IBM measured 2-5% in IO), and is emulated, so you can pass it anyway, regardless of the CPU the host has.
Therefore, CPU should be:
-cpu <cpu>,+x2apic

Version-Release number of selected component (if applicable):
Essex

How reproducible:


Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:
http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaatbpkvmasynchio.htm

Comment 3 Daniel Berrangé 2012-12-17 15:52:32 UTC

This isn't possible until this bug is addressed:

https://bugzilla.redhat.com/show_bug.cgi?id=870484