linux-kernel - Re: [PATCH v3 linux-next] cpufreq: ondemand: Calculate gradient of CPU load to early increase frequency

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Message-ID: <517A920E.3000705@semaphore.gr>
Date:	Fri, 26 Apr 2013 17:41:18 +0300
From:	Stratos Karafotis <stratosk@...aphore.gr>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 linux-next] cpufreq: ondemand: Calculate gradient of
 CPU load to early increase frequency

On 04/09/2013 07:56 PM, Stratos Karafotis wrote:
> On 04/05/2013 10:50 PM, Stratos Karafotis wrote:
>> Hi Viresh,
>>
>> On 04/04/2013 07:54 AM, Viresh Kumar wrote:
>>> Hi Stratos,
>>>
>>> Yes, your results show some improvements. BUT if performance is the
>>> only thing
>>> we were looking for, then we will never use ondemand governor but
>>> performance
>>> governor.
>>>
>>> I suspect this little increase in performance must have increased
>>> power numbers
>>> too (significantly). So, if you can get numbers in the form of
>>> power/performance
>>> with and without your patch, it will be great.
>>>
>>> --
>>> viresh
>>>
>>
>> I run some more tests. I increased the number of iterations to 100
>> (from 20).
>> I also test for counter 1,000,000 (~4200us), 5,000,000 (~10000us),
>> 15,000,000 (~30000us).
>>
>> This time, I also extracted statistics from cpufreq_stats driver. I
>> think this will be an
>> indication for power consumption. Below the results and attached the
>> program I used for to
>> get these numbers.
>
> Any comments would be appreciated.
>
> Thanks,
> Stratos
>
>

Ping.

Thanks,
Stratos
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