Date: Sat, 03 May 2014 18:07:29 -0700 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Kevin Oberman <rkoberman@gmail.com>, Adrian Chadd <adrian@freebsd.org> Cc: "current@freebsd.org" <current@freebsd.org>, Matthias Apitz <guru@unixarea.de>, David Chisnall <theraven@freebsd.org>, Eitan Adler <lists@eitanadler.com>, "freebsd-hackers@freebsd.org" <hackers@freebsd.org>, Jordan Hubbard <jkh@mail.turbofuzz.com> Subject: Re: Leaving the Desktop Market Message-ID: <536592D1.7080403@freebsd.org> In-Reply-To: <CAN6yY1uo08PDsYJ2KQNjw4hYuNsNJUvRu1b0cG%2B387F6Owkukg@mail.gmail.com> References: <CAF6rxgkeBozvfV-L0%2BrFZ6fWRn0=Gi3BNq1kPL=-HTq0TD6MkQ@mail.gmail.com> <A70900DF-4BAA-427F-8731-01211FFD1887@mail.turbofuzz.com> <3F7430D7-3C0F-43E1-8EBD-8AA4F701497C@FreeBSD.org> <20140503155745.GA2457@La-Habana> <CAJ-VmokHQvb2S-1c08J3RECUMosQ%2Bcd1gdB91LAb5famfKqP5w@mail.gmail.com> <20140503192305.GA1847@La-Habana> <CAJ-Vmon1ZYX18SN1f=z9N=hSgpZrAxXMxiJBUDWk6LYvMRiHmw@mail.gmail.com> <CAN6yY1uo08PDsYJ2KQNjw4hYuNsNJUvRu1b0cG%2B387F6Owkukg@mail.gmail.com>
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On 05/03/14 16:59, Kevin Oberman wrote: > 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. Is there any reason that TCC is on by default, actually? It seems like an anti-feature. -Nathan
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