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Date:      Wed, 12 Feb 2020 23:00:23 -0800
From:      Chris <bsd-lists@BSDforge.com>
To:        <freebsd-current@freebsd.org>
Cc:        Andrea Venturoli <ml@netfence.it>
Subject:   Re: Which AMD CPUs are supported -- temperature
Message-ID:  <54fe8d386cc038020b43d3bf99173b5f@udns.ultimatedns.net>
In-Reply-To: <0cb099c9-2a93-d244-ba72-a517dc16fe37@netfence.it>

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On Thu, 13 Feb 2020 07:00:36 +0100 Andrea Venturoli ml@netfence=2Eit said

> On 2020-02-12 23:17, Chris wrote:
>=20
> > # dmidecode -t4 | grep AMD
> > Manufacturer: AMD
> > Version: AMD Athlon(tm) II X4 630 Processor
> > # sysctl -a | grep tempe
> > dev=2Ecpu=2E3=2Etemperature: 33=2E5C
> > dev=2Ecpu=2E2=2Etemperature: 33=2E5C
> > dev=2Ecpu=2E1=2Etemperature: 33=2E5C
> > dev=2Ecpu=2E0=2Etemperature: 33=2E5C
>=20
> Also works here:
>=20
> > cat /var/run/dmesg=2Eboot
> > =2E=2E=2E
> > CPU: AMD Phenom(tm) II X4 965 Processor (3415=2E38-MHz K8-class CPU)
> > sysctl -a|grep temp
> > dev=2Ecpu=2E3=2Etemperature: 43=2E6C
> > dev=2Ecpu=2E2=2Etemperature: 43=2E6C
> > dev=2Ecpu=2E1=2Etemperature: 43=2E6C
> > dev=2Ecpu=2E0=2Etemperature: 43=2E6C
>=20
>=20
>=20
>=20
>=20
>=20
> >=20
> > # # # BROKEN
> > # dmidecode -t4 | grep AMD
> > Manufacturer: AuthenticAMD
> > Version: AMD Athlon(tm) X4 860K Quad Core Processor
> > # sysctl -a | grep tempe
> > dev=2Ecpu=2E3=2Etemperature: 13=2E1C
> > dev=2Ecpu=2E2=2Etemperature: 13=2E1C
> > dev=2Ecpu=2E1=2Etemperature: 13=2E1C
> > dev=2Ecpu=2E0=2Etemperature: 13=2E1C
> >=20
> > All but one is in the same class=2E But one in that same
> > class doesn't work=2E The FX class also works fine=2E
> > I'm puzzled=2E=2E=2E :(
>=20
Thanks for the reply!

> This reminds me of my first Ryzen 2: 11=2E3 would not get the temperature=
=20
> right, but 12=2E1 did=2E
> If I understand correctly, AMD just gives a temperature reading in the=20
> same way on all CPUs, but different models require different adjustment=
=20
> to that value (with some offset and/or other calculations); see=20
> /usr/src/sys/dev/amdtemp/amdtemp=2Ec=2E

Heh, since I first discovered that I wasn't getting correct output,
I went straight to svn=2Efreebsd=2Eorg/head and started walking the revisions
on amdtemp=2Ec -- even many proposals -- https://reviews=2Efreebsd=2Eorg/D9759
for example=2E But I've grown weary of building world && kernels in hopes
of finding just the right revision=2E :P
> Perhaps this CPU needs a formula which FreeBSD's driver does not have?
> Of course this is a wild guess, as I have not access to the specs=2E
This is what I gathered from reading the source && comments=2E I read one
where "linux" suggests it starts at -28C=2E So if I add +28 to my current
output, that puts it about where I would expect it to be=2E But like you say;
it's all guesswork without the specs=2E

The CPU in question returns the following in dmesg(8), in case anyone cares=
:

AMD Athlon(tm) X4 860K Quad Core Processor (3700=2E07-MHz K8-class CPU)
Origin=3D"AuthenticAMD"  Id=3D0x630f01  Family=3D0x15  Model=3D0x30  Steppi=
ng=3D1
Features=3D0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,=
MCA,
CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
Features2=3D0x3e98320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,SSE4=2E1,SSE4=2E2,POPC=
NT,
AESNI,XSAVE,OSXSAVE,AVX,F16C>
AMD Features=3D0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
AMD Features2=3D0xfebbfff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,O=
SVW,IBS,
XOP,SKINIT,WDT,LWP,FMA4,TCE,NodeId,TBM,Topology,PCXC,PNXC,<b25>,DBE,PTSC>
Structured Extended Features=3D0x9<FSGSBASE,BMI1>
XSAVE Features=3D0x1<XSAVEOPT>
SVM: Features=3D0x1cff<NP,LbrVirt,SVML,NRIPS,TscRateMsr,VmcbClean,FlushByAs=
id,DecodeAssist,PauseFilter,
<b11>,PauseFilterThreshold>
Revision=3D1, ASIDs=3D65536


Thanks again!

--Chris
>=20
>  bye
> =09av=2E





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