On Wed, Jan 18, 2017 at 2:34 PM, Subscriber <ml-lists at 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? > > Thx. > > > In the mean time, if you have not disabled it, you should find some collected statistics from sysstat/sar. Look at the sarXX files under /var/log/sa. They should be kept for 30 day by default in CentOS 7. So you can compare cpu, mem, I/O profiles before and after the upgrade. If you have access to Red Hat documents you can look also here: https://access.redhat.com/articles/325783 or in general some articles like this: https://www.blackmoreops.com/2014/06/18/sysstat-sar-examples-usage/ and to create pdf graphics with kSar https://www.thomas-krenn.com/en/wiki/Linux_Performance_Analysis_using_kSar HIH, Gianluca