Bug 572582

Summary:	KVM: Guests loosing network connectivity after few migration operations.
Product:	Red Hat Enterprise Linux 5	Reporter:	Oded Ramraz <oramraz>
Component:	kvm	Assignee:	Izik Eidus <ieidus>
Status:	CLOSED INSUFFICIENT_DATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	5.4	CC:	akong, llim, plyons, tburke, virt-maint, ykaul
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-05-10 10:35:28 UTC	Type:	---
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:	556823, 580948

Description Oded Ramraz 2010-03-11 15:45:41 UTC

Description of problem:

When i run migration of X concurrent loaded Windows guests some of the guests are loosing theirs network connectivity after few iterations: ( see also BZ 499110 )
Guests answer to ping queries on the destination host only after few minutes.

We had the same issue with 5.4 kernel before.

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


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:
Host CPU model: Intel(R) Xeon(R) CPU E5310  @ 1.60GHz
KVM version: kvm-83-161.el5
Kerenl version:  2.6.18-191.el5 #1 SMP Mon Mar 1 15:59:02 EST 2010 x86_64 x86_64 x86_64 GNU/Linux

Comment 2 Dor Laor 2010-03-11 21:43:28 UTC

Oded, what's the host load? You said (off bugzilla, why not add it here?) that manual migration does work. What happens when you manually do migration with movies? 

What about capturing tcpdump on the destination to see tx packets?

Comment 3 Oded Ramraz 2010-03-14 08:33:56 UTC

I'm not sure that this bug is related to the Guest load:
When the movie ended on guest it paused from some reason instead of continue in a loop ( probably KVM/Media player issue ).
After the movie was stopped the problem still occurred.
I think that the issue here is the migration frequency rather than load.
If you need help with capturing tcpdump on the destination to see tx packets i can help/guide Lawrence guys how to do it.