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Re: [Libreboot-dev] enable C2E, C4E and dynamic L2 cache on model_6ex cp
From: |
Leah Woods |
Subject: |
Re: [Libreboot-dev] enable C2E, C4E and dynamic L2 cache on model_6ex cpu |
Date: |
Wed, 01 Jun 2016 03:21:26 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.8.0 |
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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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