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From: Alexandra Yates <alexandra.yates at linux.intel.com>
Subject: Re: [Powertop] [PATCH 1/1] tunable: update sched_mc_power_savings
 target value
Date: Fri, 22 Aug 2014 18:10:47 -0700
Message-ID: <58681.10.7.198.163.1408756247.squirrel@linux.intel.com>
In-Reply-To: CAJDL4uL73EeF5MJPApcEkHirSS69kioYzHfu+evGT8DNyU9_eA@mail.gmail.com
To: powertop@lists.01.org
List-ID: <powertop@lists.01.org>

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> On Tue, Aug 19, 2014 at 7:49 AM, Sergey Senozhatsky <
> sergey.senozhatsky(a)gmail.com> wrote:
>
>> On (08/13/14 21:28), Nanley Chery wrote:
>> > Starting in kernel 2.6.29, the highest power savings level increased
>> to
>> "2".
>> > However, in kernel 3.5, the sched power savings feature was removed
>> altogether.
>>
>> hello,
>> thanks for reporting,
>>
>>
>> so, it's been removed 2 years ago (3.5 release date was 21 Jul 2012).
>>
>> do we need to support it at all?
>
>
> Hello,
>
> Good question. Our README file indicates linux-kernel >=3D 2.6.38 to be a
> build requirement. Does this mean we support power management features
> starting from that kernel? Or does it mean that this is only a build
> requirement and we target the latest kernels? It is not clear from the
> current documentation.
>
> On a much smaller scope, supporting this feature is essentially free
> (maintenance-wise) and would keep some of our end users on older kernels
> happy. Btw, I submitted a simpler version 2 of this patch that does not
> check for the kernel version.
>
> Thanks,
> Nanley
> _______________________________________________
> PowerTop mailing list
> PowerTop(a)lists.01.org
> https://lists.01.org/mailman/listinfo/powertop
>

>>From PowerTOP 2.0 and up the requirement is to run at least Linux kernel
2.6.38. If it is not in the supported kernel then PowerTOP does not need
it.

Thank you,
Alexandra.

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