Date: Sat, 15 Mar 2008 16:20:03 GMT From: Nate Eldredge <neldredge@math.ucsd.edu> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/120490: powerd should let me specify desired frequencies Message-ID: <200803151620.m2FGK31S050427@freefall.freebsd.org>
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The following reply was made to PR bin/120490; it has been noted by GNATS. From: Nate Eldredge <neldredge@math.ucsd.edu> To: Kris Kennaway <kris@FreeBSD.org> Cc: Nate Eldredge <neldredge@ucsd.edu>, freebsd-gnats-submit@FreeBSD.org Subject: Re: bin/120490: powerd should let me specify desired frequencies Date: Sat, 15 Mar 2008 08:52:55 -0700 (PDT) On Sun, 17 Feb 2008, Kris Kennaway wrote: > Nate Eldredge wrote: > >> powerd(8) in adaptive mode adjusts the CPU frequency based on the list from >> dev.cpu.0.freq_levels, it gradually moves through all available >> frequencies. However, in my case this is not desirable; only two of the >> available frequencies are actually useful. The CPU's full speed is 1800 >> MHz; powernow also has a 1000 MHz setting that saves about 20W. But there >> are a bunch of other frequencies that apparently come from ACPI. They do >> slow down the CPU, but based on my tests the machine's power consumption >> does not actually change, so there is not much point in using them. >> Furthermore, the ACPI frequencies include some really low ones (250MHz or >> so) which crash the machine if selected. So I really just want powerd to >> switch between 1800 and 1000. >> >> It would be useful for powerd to have an option to manually specify a list >> of desired frequencies. > > Just disable the services that are providing the alternate frequencies. > Probably acpi_throttle. Just to follow up: that worked. I put hint.acpi_throttle.0.disabled="1" in /boot/device.hints. Thanks! -- Nate Eldredge neldredge@math.ucsd.edu
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