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?
>
> 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
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