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Bug 1254334

Summary: Unreliable cpu detection through glibtop
Product: Red Hat Enterprise Linux 6 Reporter: Helio Chissini de Castro <hcastro>
Component: gnome-system-monitorAssignee: David King <dking>
Status: CLOSED ERRATA QA Contact: Desktop QE <desktop-qa-list>
Severity: low Docs Contact:
Priority: unspecified    
Version: 6.7CC: asegundo, cww, jkoten, jmunilla, mboisver, tpelka
Target Milestone: rcKeywords: Reopened
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: gnome-system-monitor-2.28.0-13.el6 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-03-21 09:08:16 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:    
Bug Blocks: 1172231    
Attachments:
Description Flags
Patch for RHEL 6 Gnome none

Description Helio Chissini de Castro 2015-08-17 18:11:30 UTC
Created attachment 1064025 [details]
Patch for RHEL 6 Gnome

glibtop not provides the number of cpus on the machine directly, relying on a list with the current load of each core.

Original code assume that a 0 load core is the end of cpu list, which is invalid in cases of machines with high number of cores, that happens to some cores stay idle with 0 load.

Since this can happens in any core number, if a machine has 192 cores, but the core number 5 has 0 load, then 4 cores will be wrongly reported.

Using standard sysconf api solves the issue in a simple way.

Comment 1 Helio Chissini de Castro 2015-08-17 18:12:40 UTC
Similar bug was opened for RHEL 7.
This one contains the patch for the previous Gnome from RHEL 6

Reference on RHEL 7
https://bugzilla.redhat.com/show_bug.cgi?id=1254332

Comment 6 David King 2016-08-25 16:37:05 UTC
As the patch is already written, this is a very easy fix.

Comment 8 Michael Boisvert 2016-12-20 17:06:16 UTC
While testing a multi-core machine with gnome-system-monitor-2.28.0-13.el6, I was able to see the correct amount of cores listed, as well as the idle cores at 0.0%.

Comment 10 errata-xmlrpc 2017-03-21 09:08:16 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-2017-0578.html