Date: Thu, 12 Jan 2006 01:00:40 -0500 From: Jonathan Noack <noackjr@alumni.rice.edu> To: Mike Jakubik <mikej@rogers.com> Cc: freebsd-stable@freebsd.org Subject: Re: powerd effectiveness Message-ID: <43C5F088.1040108@alumni.rice.edu> In-Reply-To: <43C5EAB0.3090805@rogers.com> References: <43C5A261.1020407@rogers.com> <200601121326.18384.doconnor@gsoft.com.au> <43C5CB63.7060202@rogers.com> <200601121554.55657.doconnor@gsoft.com.au> <43C5EAB0.3090805@rogers.com>
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Mike Jakubik wrote: > Daniel O'Connor wrote: >> On Thu, 12 Jan 2006 13:52, Mike Jakubik wrote: >>>> powerd won't run your CPU at a specific clock frequency - it varies the >>>> CPU frequency based on current load conditions. >>> >>> The load was 0, only thing that was running was mbmon. >> >> Fair enough.. still.. makes testing simpler IMO. > > Agreed. However thats how i tested it :P > >>>> You could try what I do but there are some systems which are very >>>> slow to >>>> change clock speed so this could be an impediment. >>> >>> What was part of my question, is it the hardware or the software thats >>> at fault here. I.e. would a cool n quiet system be better. >> >> Hard to say. >> I don't see how you can possibly get the frequencies you say with the >> hardware you claim. >> >> What does sysctl dev.cpu.0.freq_levels say? > > CPU: AMD Athlon(tm) Processor (1410.21-MHz 686-class CPU) > > # sysctl dev.cpu.0 > dev.cpu.0.%desc: ACPI CPU > dev.cpu.0.%driver: cpu > dev.cpu.0.%location: handle=\_PR_.CPU0 > dev.cpu.0.%pnpinfo: _HID=none _UID=0 > dev.cpu.0.%parent: acpi0 > dev.cpu.0.freq: 87 > dev.cpu.0.freq_levels: 1403/-1 1315/-1 1227/-1 1139/-1 1052/-1 964/-1 > 876/-1 789/-1 701/-1 613/-1 526/-1 438/-1 350/-1 263/-1 175/-1 87/-1 > > I think i meant 87, instead of 75. You might want to throw 'hint.acpi_throttle.0.disabled="1"' in loader.conf so acpi_throttle doesn't load. Assuming acpi_throttle is being used, this will help power consumption a lot. You could also try setting debug.cpufreq.lowest to some sane value to help with performance. -Jonathan
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