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

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Message-ID: <1513010.lqhBUJhHsL@vostro.rjw.lan>
Date:	Wed, 23 Jul 2014 01:50:28 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Stratos Karafotis <stratosk@...aphore.gr>
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 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!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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