Bug 1237286

Summary:	virt-who-0.11-5.el7.noarch has 100% CPU usage when querying environment.
Product:	Red Hat Enterprise Linux 7	Reporter:	William <wlehman>
Component:	virt-who	Assignee:	Radek Novacek <rnovacek>
Status:	CLOSED ERRATA	QA Contact:	xingge <gxing>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	7.1	CC:	alanm, gxing, hsun, jherrman, ldai, ovasik, sgao, shihliu, syangsao
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	virt-who-0.14-1.el7	Doc Type:	Bug Fix
Doc Text:	Previously, virt-who queries in some situations consumed significantly more CPU resources than expected. This update addresses the bug, and virt-who queries are now more consistently efficient in CPU usage.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-19 11:56:24 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:

Description William 2015-06-30 17:48:40 UTC

Description of problem:

On RHEL 7.1 install virt-who is consuming 100% CPU when making queries.


Version-Release number of selected component (if applicable):
RHEL 7.1
virt-who-0.11-5.el7.noarch  

How reproducible:
Persistent in the customer environment

Steps to Reproduce:
1.Install RHEL 7 on 1+ CPU system
2. configure virt-who
3. report on 100+ hypervisor /1500+ VM environment

Actual results:
100% CPU usage until virt-who completes

Expected results:
Does not consume 100% CPU resources

Additional info:

Tested virt-who-0.14-1.el7.noarch.rpm in the customer environment.  This dropepd query time to 3.5 min and CPU usage to ~35%

Comment 2 Radek Novacek 2015-07-02 06:33:03 UTC

Is the performance you've measured with virt-who-0.14-1.el7 sufficient or should we try to improve it further?

The rebased version will get to RHEL-7.2.

Comment 4 Radek Novacek 2015-07-14 07:11:25 UTC

William, thanks for confirmation. It looks that new version of virt-who has sufficient performance.

Comment 6 Eko 2015-09-07 05:11:55 UTC

we test the virt-who performance with virt-who-0.14-4.el7.noarch, no performance issue found.

10 hosts x 100 guests = 1000 guests 

The cpu and memory usage is acceptable.

Details, please refer to: https://mojo.redhat.com/docs/DOC-1044700

Comment 8 Radek Novacek 2015-09-29 07:35:03 UTC

Alan,

the change is not easy to backport into RHEL-7.1 virt-who package. The whole part touching VMWare hypervisor is rewritten and it requires changes all over the codebase.

I think it would be better to provide the same virt-who package that will be part of RHEL-7.2 to the customer now. This version is thoroughly tested by QE team.

Do you agree to provide latest virt-who package (virt-who-0.14-9.el7) to the customer as hotfix for this issue? I can rebuild it and tag it as hotfix if necessary.

Comment 10 Radek Novacek 2015-10-06 08:17:05 UTC

Hotfix build done:

https://brewweb.devel.redhat.com/taskinfo?taskID=9923102

Let me know if you need anything else.

Comment 11 errata-xmlrpc 2015-11-19 11:56:24 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2370.html

Comment 12 Red Hat Bugzilla 2023-09-14 03:01:22 UTC

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days