Date: Fri, 09 Jan 2009 13:14:33 -0800 From: Nate Lawson <nate@root.org> To: Gabriel Lavoie <glavoie@gmail.com> Cc: freebsd-acpi@freebsd.org Subject: Re: EST (Enhanced Intel SpeedStep(R) Technology) on amd64 Message-ID: <4967BE39.9020205@root.org> In-Reply-To: <d05df8620901091200v5eba8908kda486b722f4643c9@mail.gmail.com> References: <d05df8620901081551j5572b45aqbed51e2955efccc8@mail.gmail.com> <7d6fde3d0901082151t4901824cv84eb6c2be2658b15@mail.gmail.com> <d05df8620901090357h24c407aeo8e489faab6e016ca@mail.gmail.com> <496780A8.7070801@root.org> <d05df8620901091200v5eba8908kda486b722f4643c9@mail.gmail.com>
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Gabriel Lavoie wrote: > Another question. Any reason why powerd doesn't use > dev.est.0.freq_settings when it is available instead of > dev.cpu.0.freq_levels? > > On my system: > dev.cpu.0.freq_levels: 2500/88000 2187/77000 2000/47608 1750/41657 > 1600/44616 1400/39039 1200/41800 1050/36575 900/31350 750/26125 > 600/20900 450/15675 300/10450 150/5225 > dev.est.0.freq_settings: 2500/88000 2000/47608 1600/44616 1200/41800 > > If I don't lower the polling time of powerd to 100ms, my system > becomes way too much unresponsive because powerd takes too much time > to increase the frequency, step by step and there are a lot of > settings with dev.est.0.freq_settings (14). With > dev.est.0.freq_settings, the minimal setting is high enough so the > system stays responsive and powerd would bring it up to max frequency > quickly enough, even if the polling time is still kept at 500ms. This > would work more like Windows or Linux where the lowest frequency at > which the CPU will drop is the lowest EIST gives (here 1200 MHz). > levels is derived from settings. Set a lower bound with the sysctl for freq_lowest. -- Nate
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