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Subject: Re: Leaving the Desktop Market
From: Kevin Oberman <rkoberman@gmail.com>
To: Adrian Chadd <adrian@freebsd.org>
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Cc: "current@freebsd.org" <current@freebsd.org>,
 Matthias Apitz <guru@unixarea.de>, David Chisnall <theraven@freebsd.org>,
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On Sat, May 3, 2014 at 1:25 PM, Adrian Chadd <adrian@freebsd.org> wrote:

> Set it to the lowest available Cx state that you see in dev.cpu.0 .
>
>
Available is not required. Set it to C8. That guarantees that you will use
the lowest available. The correct incantation in rc.conf is "Cmax".
performance_cx_lowest="Cmax"
economy_cx_lowest="Cmax"

But, unless you want laggy performance, you will probably also want:
hint.p4tcc.0.disabled=1
hint.acpi_throttle.0.disabled=1
in /boot/loader.conf. Low Cx states and TCC/throttling simply don't mix
well and TCC is not effective, as mentioned earlier in this thread.
-- 
R. Kevin Oberman, Network Engineer, Retired
E-mail: rkoberman@gmail.com