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

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Message-ID: <51644855.1090300@semaphore.gr>
Date:	Tue, 09 Apr 2013 19:56:53 +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 04/05/2013 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


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