[CentOS-devel] Incorrect default governor on CentOS ppc64el builds

Adi Gangidi adi.gangidi at rackspace.com
Mon Jul 25 15:07:21 UTC 2016


Hey Murilo

I think so too. Tuned is causing this. But I feel like this shouldn't be the case. 

It would seem like right thing to do is to ensure post-install out of box governor should be, what's being set in kernel config 
(on-demand).

Best
Adi
________________________________________
From: Murilo Opsfelder Araújo <muriloo at linux.vnet.ibm.com>
Sent: Thursday, July 14, 2016 6:15 PM
To: centos-devel at centos.org
Cc: Adi Gangidi
Subject: Re: [CentOS-devel] Incorrect default governor on CentOS ppc64el builds

> From adi.gangidi at rackspace.com  Thu Jul 14 01:23:20 2016
> Date: Thu, 14 Jul 2016 01:23:20 +0000
>
> Hello nice people on CentOS list,
>
> ?Default governor on CentOS 7 ppc64le OS bootup is "conservative" . This has about 20% effect on benchmark numbers, if you don't change the governor to ondemand manually (for specific benchmarks). I tested this on our barreleye power 8 server.
>
> This even though kernel config is set for "ondemand" as default governor:
>
> [root at Barreleye-1 ~]# cat /boot/config-3.10.0-327.el7.ppc64le | grep -i ondemand
> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
> CONFIG_CPU_FREQ_GOV_ONDEMAND=y
>
> I filed a bug on this with details and am posting here for info and also to accelerate some response on the bug:
> https://bugs.centos.org/view.php?id=11094
>
> Best
> Adi Gangidi
> Rackspace

Hello, Adi.

Any chance that other software is overriding the default CPU governor
setting?  For example, tuned is a good candidate.

--
Murilo



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