Re: [PATCH] powernow-k6: set transition latency value so ondemandgovernor can be used

From: Ingo Molnar
Date: Mon Oct 26 2009 - 02:41:28 EST



* Krzysztof Helt <krzysztof.h1@xxxxxxxxx> wrote:

> From: Krzysztof Helt <krzysztof.h1@xxxxx>
>
> Set the transition latency to value smaller than CPUFREQ_ETERNAL so
> governors other than "performance" work (like the "ondemand" one).
>
> The value is found in "AMD PowerNow! Technology Platform Design Guide for
> Embedded Processors" dated December 2000 (AMD doc #24267A). There is the
> answer to one of FAQs on page 40 which states that suggested complete transition
> period is 200 us.

Btw., would be nice to put this paragraph between '/* .. */' signs and
put it into the source code - seems highly relevant when someone comes
across that wonders what the magic number '200000' is.

Ingo
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