Date: Sun, 4 May 2014 13:40:02 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: Leaving the Desktop Market Message-ID: <CAJ-Vmo=23_aAfNO-Nn-LVepsQHN89Q83pCqj3J710-v8=2twxA@mail.gmail.com> In-Reply-To: <536673ED.207@freebsd.org> 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> <536673ED.207@freebsd.org>
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Hm, I was hoping for a little more discussion. Mostly around the "which older CPUs do we leave this on for?" crowd. I have Pentium-M class hardware that I was going to spin up -HEAD on. So I'll go install -HEAD on said older hardware and get a list of what does and doesn't work. I'm totally fine with disabling p4tcc and acpi_throttle if P states for cpu frequency adjustment are available. I just want to ensure that the temperature throttling stuff is going to get automatically engaged (by whichever magical BIOS/ACPI/SMI thing does it) and clock things down if the CPU gets way too hot. -a On 4 May 2014 10:07, Nathan Whitehorn <nwhitehorn@freebsd.org> wrote: > 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 d=C3=ADa Saturday, May 03, 2014 a las 04:59:48PM -0700, Kevin Oberm= an >>>> escribi=C3=B3: >>>> >>>>> 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 wil= l >>>>> use >>>>> the lowest available. The correct incantation in rc.conf is "Cmax". >>>>> performance_cx_lowest=3D"Cmax" >>>>> economy_cx_lowest=3D"Cmax" >>>>> >>>>> But, unless you want laggy performance, you will probably also want: >>>>> hint.p4tcc.0.disabled=3D1 >>>>> hint.acpi_throttle.0.disabled=3D1 >>>>> in /boot/loader.conf. Low Cx states and TCC/throttling simply don't m= ix >>>>> well and TCC is not effective, as mentioned earlier in this thread. >>>> >>>> Re/ powerd I have in /etc/rc.conf: >>>> >>>> # powerd >>>> powerd_enable=3D"YES" >>>> powerd_flags=3D"-a max -b adp" >>>> # >>>> performance_cx_lowest=3D"Cmax" >>>> economy_cx_lowest=3D"Cmax" >>>> >>>> (and the additional hint.* in /boot/loader.conf as well). Which proces= s >>>> 'performance_cx_lowest' and 'economy_cx_lowest' target exactly as conf= ig >>>> values? >>>> >>>> Thx >>>> >>>> matthias >>>> >>> In a pretty unscientific test on my laptop (Lenovo T530 with Intel i5 >>> 3320M), setting hw.acpi.cpu.cx_lowest=3DC8 lowered power consumption at >>> idle by about 3 watts, which adds about 30-45 minutes to my battery lif= e >>> during conservative usage. >>> >>> Using PCBSD 10, so hint.acpi_throttle.0.disabled=3D1 was already set >>> (apparently solves some issue with powerd on some AMD systems) >>> >>> I have added hint.p4tcc.0.disabled=3D1 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 bac= k, > 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 > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= "
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