CPU graph total is not 100% since Zabbix Agent upgrade to version 3

[DamienGombaultRecia]

Hi.

I have recently updated Zabbix Agent version 3.0 on a physical server.
I have noticed since the update (at 03/02 ~6h PM), the sum of the CPU stats are not 100 % on graph :

http://imgur.com/RdR7Oez

What do you think about this ?
Is it a 3.0 agent bug ?

[DamienGombaultRecia]

Hi.

Does anybody have notice this problem ?
Should I report the bug ?

[jrcarlsen]

I can confirm this issue.

http://i.imgur.com/URHK0DS.png

Server is running CentOS 7 with the following Zabbix packages:
zabbix-release-3.0-1.el7.noarch
zabbix-server-mysql-3.0.4-1.el7.x86_64
zabbix-web-3.0.4-1.el7.noarch
zabbix-web-mysql-3.0.4-1.el7.noarch
zabbix-agent-3.0.4-1.el7.x86_64

Client is running CentOS 7 with the following Zabbix packages:
zabbix-release-3.0-1.el7.noarch
zabbix-agent-3.0.4-1.el7.x86_64

[DamienGombaultRecia]

Thank you for your message.
I have created this report : https://support.zabbix.com/browse/ZBX-11174

[Semiadmin]

Hi! Are you sure that this sum must be 100%?
This data don't receive at the same time, in my case - to 8 s between idle time and user time. During 8 s values may change.

[DamienGombaultRecia]

system.cpu.util is an average for 1 minute (default, could be 5 ou 15), I think the average CPU total usage should be 100%.
It was 100% with agent version 2.

To be consistent, I think if you add all the available values (idle, nice, user, system, iowait, interrupt, softirq, steal, guest, guest_nice), you should get 100% (tools like mpstat give 100%).
With this method, you can get a really complete stacked graph.

Currently, something is wrong, I think idle time is not correctly computed (details in bug report).
guest time is also included in user time (same thing I think with guest_nice and nice) and I think it should not.