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Bug 1424986

Summary:	Increase the default factor for the CPU weight modules to preserve balance behavior for the PowerSaving and EvenDistribution policy
Product:	[oVirt] ovirt-engine	Reporter:	Artyom <alukiano>
Component:	Backend.Core	Assignee:	Martin Sivák <msivak>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Artyom <alukiano>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	4.1.1.2	CC:	bperkins, bugs, lveyde, mgoldboi
Target Milestone:	ovirt-4.1.2	Keywords:	Triaged
Target Release:	4.1.2	Flags:	rule-engine: ovirt-4.1+ rule-engine: ovirt-4.2+
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Cause: Both CPU and memory policy units had the same priority. Consequence: The priority was undefined when two hosts had A > B relationship in terms of CPU load and B > A in terms of free memory. Fix: CPU policy unit's priority factor was increased. Result: The CPU vs memory scheduling should behave in the old way now. CPU is more important by default.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-05-23 08:16:11 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	SLA	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Artyom 2017-02-20 09:20:32 UTC

Description of problem:
Increase the default factor for the CPU weight modules to preserve balance behavior for the PowerSaving and EvenDistribution policy 

Version-Release number of selected component (if applicable):
rhevm-4.1.1.2-0.1.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. Start vm_1 on the host_1 and vm_2 on the host_2(host_2 memory < host_1 memory)
2. Create CPU load 50% on the host_1
3. 

Actual results:
The vm_2 stays on the old host and does not migrate on the host_1

Expected results:
The vm_2 must migrate to the host_1(in 4.0 we preferred CPU balancing over memory balancing)

Additional info:

Comment 1 Artyom 2017-04-26 13:41:12 UTC

Verified on rhevm-4.1.2-0.1.el7.noarch