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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 16 Apr 2013 21:34:21 +0300
From:	Stratos Karafotis <stratosk@...aphore.gr>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Viresh Kumar <viresh.kumar@...aro.org>, 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 04/10/2013 06:22 AM, Viresh Kumar wrote:
> On 9 April 2013 22:26, Stratos Karafotis <stratosk@...aphore.gr> 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.
>
> Sorry, i forgot about this mail earlier..
>
> Your performance numbers look improved but i am still not sure about
> power consumption. But as this is not going to be the default settings, i
> think we can take this patch.
>
> @Rafael:?
>

Hi Rafael,

I'm sorry for bothering you again for this patch.
Are these number adequate? Should I provide more benchmark results?

Thanks for your time.

Stratos
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/