linux-kernel - Re: [PATCH V3 2/2] cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor

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Date:	Wed, 3 Apr 2013 12:17:38 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	Borislav Petkov <bp@...en8.de>, Thomas Renninger <trenn@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>, <cpufreq@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH V3 2/2] cpufreq: AMD "frequency sensitivity feedback"
 powersave bias for ondemand governor

On Wed, Apr 03, 2013 at 07:04:56PM +0200, Borislav Petkov wrote:
> On Wed, Apr 03, 2013 at 11:53:24AM -0500, Jacob Shin wrote:
> > Then Thomas, Boris, would it be acceptable if enable the frequency
> > feedback feature by default with a sane powersave_bias tunable value?
> > And also add proper documentation for both vanila powersave_bias
> > and powersave_bias with AMD frequency sensitivity loaded to
> > Documentation/cpu-freq/ondemand ?
> 
> Yeah, this was what I was proposing, basically. The only question here
> is, would anyone want to disable freq decisions on systems with hw
> feedback? If yes, then you'd need to be able to disable the feedback
> thing, maybe have a magic value for powersave_bias...

Writing 0 to powersave_bias or unloading the AMD driver could do that.

When the AMD driver loads, it will give a sane default value to
powersave_bias to enable it, when it unloads, it will put it back to 0

> 
> Thanks.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> Sent from a fat crate under my desk. Formatting is fine.
> --
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