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@xxxxxxxxxx] On Behalf Of Sandro Bonazzola
Sent: Thursday, January 19, 2017 6:12 PM
To: Subscriber <ml-lists@xxxxxxxxxxxxx>; Discussion about the virtualization on CentOS <centos-virt@xxxxxxxxxx>
Cc: centos@xxxxxxxxxx
Subject: Re: Increase CPU usage on HV after upgrade (7.2 -> 7.3) On Wed, Jan 18, 2017 at 2:34 PM, Subscriber <ml-lists@xxxxxxxxxxxxx> 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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