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

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Date:	Wed, 23 Jul 2014 12:01:13 +0300
From:	Stratos Karafotis <stratosk@...aphore.gr>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	viresh.kumar@...aro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] cpufreq: ondemand: Eliminate the deadband effect

On 07/23/2014 02:50 AM, Rafael J. Wysocki wrote:
> On Monday, June 30, 2014 07:59:32 PM Stratos Karafotis wrote:
>> Hi all,
>>
>> 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
>>
>> Thanks
>>
>>
>> Stratos Karafotis (2):
>>    cpufreq: Introduce new relation for freq selection
>>    cpufreq: ondemand: Eliminate the deadband effect in low loads
>>
>>   drivers/cpufreq/cpufreq_ondemand.c | 11 +++++++----
>>   drivers/cpufreq/freq_table.c       | 12 +++++++++++-
>>   include/linux/cpufreq.h            |  1 +
>>   3 files changed, 19 insertions(+), 5 deletions(-)
>
> OK, I've queued up these two patches for 3.17.  We'll see if anyone sees
> any problems related to them.  Thanks!
>

Thank you!

Stratos
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