linux-kernel - Re: [PATCH 0/2] cpufreq: ondemand: Eliminate the deadband effect

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Message-ID: <53C2B9D3.6040500@semaphore.gr>
Date:	Sun, 13 Jul 2014 19:54:43 +0300
From:	Stratos Karafotis <stratosk@...aphore.gr>
To:	Doug Smythies <dsmythies@...us.net>, rjw@...ysocki.net,
	viresh.kumar@...aro.org
CC:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] cpufreq: ondemand: Eliminate the deadband effect

Hi Doug,

On 12/07/2014 06:45 μμ, Doug Smythies wrote:
> 
> On 2014.07.30 10:00 Stratos Karafotis wrote:
> 
>> This patchset changes slightly the calculation of target frequency to
>> eliminate the deadband effect (explained in patch 2 changelog) that it
>> seems to slow down the CPU in low and medium loads.
>>
>> Patch 1 introduces a new relation (RELATION_C) for the next frequency
>> selection, which chooses the closest frequency to target.
>>
>> Patch 2 is the actual change to ondemand governor.
> 
>> You may find graphs with the 'deadband' effect and benchmark results:
>> https://docs.google.com/spreadsheets/d/16kDBh5lyc6YvBnoS1hUa1t2O38z0xrWvaEj5XtJ8auw/edit#gid=2072493052
> 
> I did the same benchmark tests before (without) and after (with) this patch set on my i7-2600K system.
> I added the results, which are similar to Stratos', under a new "benchmark" tab on the spreadsheet.

Thank you very much for your benchmarks!

Stratos
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