Date: Sun, 04 May 2014 10:07:57 -0700 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Leaving the Desktop Market Message-ID: <536673ED.207@freebsd.org> In-Reply-To: <53667352.4030807@allanjude.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> <20140504142839.GA9271@La-Habana> <53666102.5080205@allanjude.com> <53667352.4030807@allanjude.com>
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On 05/04/14 10:05, Allan Jude wrote: > On 2014-05-04 11:47, Allan Jude wrote: >> On 2014-05-04 10:28, Matthias Apitz wrote: >>> El día Saturday, May 03, 2014 a las 04:59:48PM -0700, Kevin Oberman escribió: >>> >>>> 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. >>> Re/ powerd I have in /etc/rc.conf: >>> >>> # powerd >>> powerd_enable="YES" >>> powerd_flags="-a max -b adp" >>> # >>> performance_cx_lowest="Cmax" >>> economy_cx_lowest="Cmax" >>> >>> (and the additional hint.* in /boot/loader.conf as well). Which process >>> 'performance_cx_lowest' and 'economy_cx_lowest' target exactly as config >>> values? >>> >>> Thx >>> >>> matthias >>> >> In a pretty unscientific test on my laptop (Lenovo T530 with Intel i5 >> 3320M), setting hw.acpi.cpu.cx_lowest=C8 lowered power consumption at >> idle by about 3 watts, which adds about 30-45 minutes to my battery life >> during conservative usage. >> >> Using PCBSD 10, so hint.acpi_throttle.0.disabled=1 was already set >> (apparently solves some issue with powerd on some AMD systems) >> >> I have added hint.p4tcc.0.disabled=1 but not sure where to expect to see >> a difference. >> > I see the difference now, with the p4tcc stuff disabled, the lowest > cpufreq is now 1200mhz instead of 150mhz > > I just set the default for acpi_throttle and p4tcc in HEAD to disabled by adding these line to the default /boot/device.hints. If you want them back, editing your device.hints will restore them. This can be reverted if many people want throttling enabled by default, but all I have heard so far -- and for the past many years -- is a unanimous chorus to turn it off. -Nathan
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