On Wed, Jan 18, 2017 at 2:34 PM, Subscriber 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?
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