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Subject: Re: Wrong temperature with AMD and amdtemp.ko
To: Willem Jan Withagen <wjw@digiware.nl>,
 freebsd current <freebsd-current@freebsd.org>
References: <560EDCA9.1070101@withagen.nl> <560EEDC3.90809@digiware.nl>
From: Jung-uk Kim <jkim@FreeBSD.org>
Message-ID: <560EF1DF.3030409@FreeBSD.org>
Date: Fri, 2 Oct 2015 17:06:39 -0400
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On 10/02/2015 16:49, Willem Jan Withagen wrote:
> 
> Hi
> 
> 10.2-STABLE FreeBSD 10.2-STABLE #0 r287102: Mon Aug 24
> 
> Processor: Opteron 6812, in Supermicro H8SGL
> 
> dev.cpu.7.temperature: 11.1C dev.cpu.6.temperature: 11.1C 
> dev.cpu.5.temperature: 11.1C dev.cpu.4.temperature: 11.1C 
> dev.cpu.3.temperature: 11.1C dev.cpu.2.temperature: 11.1C 
> dev.cpu.1.temperature: 11.1C dev.cpu.0.temperature: 11.1C
> 
> But I'm pretty sure it is not 11.1C in the datacenter....
> 
> Or should I not use amdtemp.ko for this?

amdtemp(4):

For Family 10h and later processors, “(the reported temperature) is a
non-physical temperature measured on an arbitrary scale and it does not
represent an actual physical temperature like die or case temperature.
Instead, it specifies the processor temperature relative to the point at
which the system must supply the maximum cooling for the processor's
specified maximum case temperature and maximum thermal power dissipation”
according to BIOS and Kernel Developer's Guide (BKDG) for AMD Processors,
http://developer.amd.com/documentation/guides/Pages/default.aspx.

Jung-uk Kim
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