Date: Wed, 04 Oct 2006 22:43:43 -0700 From: Nate Lawson <nate@root.org> To: Kevin Oberman <oberman@es.net> Cc: acpi@freebsd.org Subject: Re: Odd power management on ThinkPad T43 Message-ID: <45249B8F.2060407@root.org> In-Reply-To: <20060823043830.6E09245055@ptavv.es.net> References: <20060823043830.6E09245055@ptavv.es.net>
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Kevin Oberman wrote: > I'm running current on an IBM ThinkPad T43 and I'm not sure I have a problem, > but something odd seems to be going on. > > I have a 2.0 GHz Pentium-M which I believe is 760. I believe it's one IBM has > not released information on the EST specs. > > If I do NOT have cpufreq loaded, I see: > dev.cpu.0.freq_levels: 2000/27000 1750/23625 1600/22600 1400/19775 1333/19666 > 1166/17207 1066/16733 932/14641 800/13800 700/12075 600/10350 500/8625 > 400/6900 300/5175 200/3450 100/1725 > > If I load cpufreq I see: > dev.cpu.0.freq_levels: 1500/-1 1312/-1 1200/-1 1050/-1 1000/-1 875/-1 800/-1 > 700/-1 600/-1 525/-1 450/-1 375/-1 300/-1 225/-1 150/-1 75/-1 > > With cpufreq I report perf0, est0 and p4tcc0 in dmesg. Without loading cpufreq > I still see acpi_perf0 and acpi_throttle0. > > This would lead me to believe that without cpufreq I am only seeing > throttling, but I see my clock speed decrease (x86info) which I did not expect > to see with pure throttling. > > Am I better off when on battery to use cpufreq or not? Is there something to > tweak to get full 2GHz performance with EST? This sounds like a bad table match for est0. Perhaps it's detecting your CPU as a 1.5Ghz one when it's actually 2Ghz. An easy way to tell is to load cpufreq but disable just est with: hint.est.0.disabled="1" You should get acpi_perf and p4tcc, and the frequencies will be correct for your system. acpi_perf is often more user-friendly anyway since it reports the power consumed at each level instead of just "-1". It's also possible you were booting on battery and had lower levels available. Easy way to tell is report output of sysctl -a | grep cpu -- Nate
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