It is hard to define that extra % are leak due to upgrade, maybe should try on little heavy load VM and see if it is still constant.

Xlord

From: CentOS-virt [mailto:centos-virt-bounces@centos.org] On Behalf Of Sandro Bonazzola Sent: Thursday, January 19, 2017 6:12 PM To: Subscriber ml-lists@agoris.net.ua; Discussion about the virtualization on CentOS centos-virt@centos.org Cc: centos@centos.org Subject: Re: [CentOS-virt] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

On Wed, Jan 18, 2017 at 2:34 PM, Subscriber <ml-lists@agoris.net.ua mailto:ml-lists@agoris.net.ua > wrote:

Hello ,

After upgrading the system from CentOS 7.2.1511 to CenOS 7.3.1611 I see that the average processing time has increased from 5-7% to 12-15% (doubled). Not critical but it is not pleasant. Server as KVM with 5 virtual machines. Someone noticed something similar? If so, how to fix that?

Discussed with KVM guys, here's the answer:

1% per VM seems to much on idle VM; if the VM is not idle you are getting better performance in exchange. For idle VMs the difference should be roughly 0.1% per VM.

Thx.

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