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Description of problem:
virt-manager supports some simple stats directly in the default domain list view. However disk, network and memory stats are broken - the respective graph are *always* blank.
The issue seems caused by bad use of the "//" python operator, which erroneously sets to 0 (zero) the graph line. A fix for the problem seems to be present since virt-manager ver. 1.5.1-1 (see: https://koji.fedoraproject.org/koji/buildinfo?buildID=1051929), but it is unavailable in current RHEL 7.6 (which has version virt-manager-1.5.0).
As the fix really is trivial (replace "//" with "/" in two line of codes), please implement it or ship a newer virt-manager release. Please also note that this issue directly clashes with the released documentation you can find here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/sect-virtualization_tuning_optimization_guide-monitoring_in_virt_manager#sect-Managing_guests_with_the_Virtual_Machine_Manager_virt_manager-Displaying_Disk_IO
Version-Release number of selected component (if applicable):
virt-manager-1.5.0-1.el7.noarch
How reproducible:
Start virt-manager, enable disk, network and memory stats, launch a virtual machines with some disk/net load; the disk/mem/net stats graphs remains blank.
Steps to Reproduce:
1. launch virt-manager and enable disk/net/mem stats;
2. launch a virtual machine and put some disk/net load on it;
3. the disk/net/mem graphs on virt-manager domain lists remain blank
Actual results:
disk/net/mem graphs on virt-manager domain lists remain blank
Expected results:
disk/net/mem graphs on virt-manager domain lists are populated based on real load
Additional info:
I can reproduce this bug with packages:
virt-manager-1.5.0-5.el7.noarch
Result: disk/net/mem graphs on virt-manager domain lists remain blank (Please see screenshot-1)
Then try to verify this bug with new build:
virt-manager-1.5.0-6.el7.noarch
libvirt-4.5.0-18.el7.x86_64
qemu-kvm-rhev-2.12.0-29.el7.x86_64
Steps:
1. Launch virt-manager:
# virt-manager
2. Click Edit->Preferences on Virtual Machine Manager window.
3. Click Polling on Preferences window, checking on "Poll Network I/O", "Poll Disk I/O" and "Poll Memory stats", then click "Close" button.
4. Click View->Graph-> checking on "Memory Usage", "Network I/O" and "Disk I/O".
5. Right click one VM and select Run to run it, then login vm to put some disk/net load on it.
eg: # dd if=/dev/zero of=/tmp/test bs=1M count=20000
6. Check the disk/net/mem graphs on virt-manager domain lists.
Result: Disk/net/mem graphs on virt-manager domain lists are populated based on real load.(Please see screenshot-2)
So I move this bug from ON_QA to VERIFIED based on above testing.
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://access.redhat.com/errata/RHBA-2019:2232