Re: [Libreboot-dev] enable C2E, C4E and dynamic L2 cache on model_6ex cpu

[Leah Woods]

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merged. thanks

Op 31/05/16 om 19:59 schreef Arthur Heymans:
> 
> Hi
> 
> I saw some TODO in the model_6ex code about extended deeper sleep
> (C4E) and dynamic L2 cache. This is the code for core duo 32bit cpu
> found in the x60, t60, macbook1,1. I just copied the msr bits from
> a later cpu in that code and it worked.
> 
> What this is supposed to do is force C2 in C2E and C4 in C4E.
> Those are intel specific c-states that reduce the voltage more in
> the cpu.
> 
> For the idle power usage (C4) not much change. For the C2 state it
> improves things a lot. C2 seems to consume a lot of power (17-18W)
> and after this patch it went down to ~14W. So depending on the
> workload power usage might improve a little.
> 
> This is measured using battery discharge rate which can be
> inaccurate. Someone with a good power meter might be able to check
> differences more accurately.
> 

- -- 
Leah Woods

Libreboot developer
Freenode IRC nick (#libreboot): vimuser

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