Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods

Arjan van de Ven
2017-07-18T16:38:53Z

On 7/18/2017 9:36 AM, Peter Zijlstra wrote:
> On Tue, Jul 18, 2017 at 08:29:40AM -0700, Arjan van de Ven wrote:
>>
>> the most obvious way to do this (for me, maybe I'm naive) is to add another
>> C state, lets call it "C1-lite" with its own thresholds and power levels etc,
>> and just let that be picked naturally based on the heuristics.
>> (if we want to improve the heuristics, that's fine and always welcome but that
>> is completely orthogonal in my mind)
>
> C1-lite would then have a threshold < C1, whereas I understood the
> desire to be for the fast-idle crud to have a larger threshold than C1
> currently has.
>
> That is, from what I understood, they want C1 selected *longer*.

that's just a matter of fixing the C1 and later thresholds to line up right.

shrug that's the most trivial thing to do, it's a number in a table.

some distros do those tunings anyway when they don't like the upstream tunings