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Bug 1374731

Summary:	disable migration compression in the default policy
Product:	[oVirt] ovirt-engine	Reporter:	Michal Skrivanek <michal.skrivanek>
Component:	BLL.Virt	Assignee:	Michal Skrivanek <michal.skrivanek>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Israel Pinto <ipinto>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	4.0.2.2	CC:	bugs, ipinto, tjelinek
Target Milestone:	ovirt-4.0.5	Flags:	michal.skrivanek: ovirt-4.0.z? michal.skrivanek: planning_ack? rule-engine: devel_ack+ rule-engine: testing_ack+
Target Release:	4.0.5
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2017-01-18 07:39:21 UTC	Type:	Bug
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oVirt Team:	Virt	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Michal Skrivanek 2016-09-09 13:33:09 UTC

Concerns has been raised about the benefits and drawbacks of migration compression feature which was optional in 3.6 and is now part of the default profile in 4.0.
The impact of higher CPU and memory usage has not been fully understood and some of the initial testing was flawed

We may want to do further testing but until that's done we should consider disabling it in the default case

Comment 1 Michal Skrivanek 2016-09-21 11:56:48 UTC

can you give it a try and compare the impact please?

Comment 2 Israel Pinto 2016-09-30 18:12:20 UTC

Checked with 4.0.4.4-0.1.el7ev
Set compression off in default policy.
Migrate 1 GB and 10 GB VM,
The migrate took 17 sec for 1GB VM and 23 sec for 10GB VM which is longer then with compression about 17%-15% more.
No errors found in host(vdsm,libvirt)/engine logs

Comment 3 Israel Pinto 2016-10-06 06:45:08 UTC

Verify with:
Engine: 4.0.5-0.1.el7ev
Host:
OS Version:RHEL - 7.2 - 9.el7_2.1
Kernel Version:3.10.0 - 327.35.1.el7.x86_64
KVM Version:2.3.0 - 31.el7_2.22
LIBVIRT Version:libvirt-1.2.17-13.el7_2.6
VDSM Version:vdsm-4.18.5.1-1.el7ev
SPICE Version:0.12.4 - 15.el7_2.2

Steps:
1. Create VM with 1 GB and VM with 1 GB memory
2. Migrate VMs 
3. Check logs on engine and hosts

Results:
Migrate PASS, No errors found on logs