Date: Mon, 28 Oct 2002 14:51:31 -0800 From: Peter Wemm <peter@wemm.org> To: Garrett Wollman <wollman@lcs.mit.edu> Cc: current@FreeBSD.org Subject: Re: A success story, of sorts Message-ID: <20021028225131.A59CD2A896@canning.wemm.org> In-Reply-To: <200210282232.g9SMW9NE043136@khavrinen.lcs.mit.edu>
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Garrett Wollman wrote:
> I have no clue how to interpret the output from `sysctl
> hw.acpi.thermal'.
peter@mobile[2:44pm]~-100> sysctl hw.acpi.thermal
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 30
hw.acpi.thermal.tz0.temperature: 3281
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: 3581
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 3731
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
The temperatures are in kelvin * 10. ie: subtract 2731 to get degrees
celcius, then divide by 10. In my case above: 3281 - 2731 = 550, or 55.0C.
There are two types of cooling. active or passive. In my case its passive -
ie: fully automatic. _PSV is the nominal temperature that the fan starts
to kick in at, 85C in this case. _CRT is the critical ("you're about
to catch fire") alert temperature - 100C in my case. I think _HOT is the
point that you should be worried, while _CRT = "power down now or else!".
The various _AC0, _AC1 etc are for the active cooling system. ie: the OS has
to monitor the temperature, and set the fan speed as it crosses the _AC*
levels. There is another method that it calls to do this, and this is driven
by the kthread acpi_fan or acpi_thermal, I dont remember exactly.
".tz0." is "thermal zone 0". There may be more than one zone, especially in
larger servers.
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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