Date: Sun, 22 Oct 2023 21:42:03 -0700 From: Mark Millard <marklmi@yahoo.com> To: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: ThreadRipper 1950X context: example kldload amdtemp related temperature reports for idle conditions? Message-ID: <4FA3FA86-38A6-43C6-8DBE-075C25248E93@yahoo.com> In-Reply-To: <22EFB7F1-F51A-4B07-8C9F-2B6189B410F0@yahoo.com> References: <22EFB7F1-F51A-4B07-8C9F-2B6189B410F0@yahoo.com>
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On Oct 22, 2023, at 14:33, Mark Millard <marklmi@yahoo.com> wrote: > Is anyone familiar with what what they normally see on an idle > ThreadRipper 1950X via the likes of (presumes kldload amdtemp > had already been done): > > # sysctl dev.amdtemp | grep "[0-9]\.[0-9]C$" > > (Approximate ambient air temperature for the context would be a > bonus.) > > I do not have a history of monitoring this, unfortunately. What I see for idle vs all hardware threads fully busy (buildworld -j32 's llvm lib* build activity): fully busy: about 95 degC reported idle: low 60's degC reported, say 62 degC: (varies more than the 95 figure does) # sysctl dev.amdtemp | grep "[0-9]\.[0-9]C$" dev.amdtemp.1.core0.sensor0: 62.1C dev.amdtemp.0.ccd0: 62.5C dev.amdtemp.0.core0.sensor0: 62.1C AMD's published 1950X maximum operating Tjmax is 68 degC. The max reported figure's delta vs. documented maximum: about 95 degC - 68 degC = 27 degC Various notes on the web report that in order for the tCTL used for fan control to have about the same maximum across various machines, ThreadRipper 1950X's use: tCTL = operatingTjmax + 27 degC So, it looks like the dev.amdtemp reported values are tCTL-like for units, so biased toward fan control use. Idle shifted similarly down from reported: 62 degC - 27 degC = about 35 degC Overall: it seems I'm seeing a range for idle through fully-busy of about (operatingTjmax): 35 degC .. 68 degC but reported as more like (tCTL): 62 degC .. 95 degC === Mark Millard marklmi at yahoo.com
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