[elrepo] Performance issue

[Mahmood Naderan]

Has anyone else measured the performance of newer kernels vs the default?
Any comment is welcome.

Regards,
Mahmood



On Sun, Feb 11, 2018 at 6:14 PM, Mahmood Naderan <mahmood.nt at gmail.com>
wrote:

> Hi,
> I am using a Centos 7 where the default kernel version is 3.10. I have
> installed that on a VirtualBox as a test system. Then I decided to upgrade
> the kernel to 4.15 with the elrepo packages.
>
> With the NAS parallel benchmark suite, I have noticed some performance
> degradation. The runtime is about one minute longer with 4.15. I know that
> this using VirtualBox is not a good infrastructure for performance
> measurements, but may be can be used as a hint.
>
> See the results below
>
> Kernel-3.10
>   bt.C.4    =>    698.12 sec
>   ep.D.4    =>    2561.44 sec
>   cg.C.2    =>    187.96 sec
>   ft.C.2    =>    288.49 sec
>   ft.C.4    =>    160.72 sec
>   lu.C.4    =>    541.46 sec
>   lu.D.4    =>    12705.02 sec
>
> Kernel-4.15
>   bt.C.4    =>    746.17 sec
>   ep.D.4    =>    2510.52 sec
>   cg.C.2    =>    209.17 sec
>   ft.C.2    =>    284.43 sec
>   ft.C.4    =>    155.67 sec
>   lu.C.4    =>    646.67 sec
>   lu.D.4    =>    16930.73 sec
>
> Any idea?
>
> Regards,
> Mahmood
>
>
>
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