[Fwd: xeontemp vs. adm1021]

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According to the Intel datasheet for the 533FSB Xeon they say that 
they have a sensor diode embedded in the processor with two pins 
available to access it.  According to the Supermicro X5DPA-GG 
documentation they claim to have a sensor chip that can read that,
although I don't have the technical documentation to prove that it
is indeed a max1617 type chip.. it is likely that whatever I'm 
reading is hooked up to the internal temperature diode.

Steve


------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525  timm at fnal.gov  http://home.fnal.gov/~timm/
Fermilab Computing Division/Core Support Services Dept.
Assistant Group Leader, Scientific Computing Support Group
Lead of Computing Farms Team

On Thu, 29 Jul 2004, Philip Edelbrock wrote:

> 
> That's a good question.  It certainly looks as if it is the CPU temp 
> since it is quite a bit higher than the board temp.  Strange that the 
> two CPU's are so different in temp readings, though.  It's also possible 
> that those readings are actually for something else (like the power supply).
> 
> What I would try is to load the machine and monitor the temperatures. 
> The board temps should rise slowly, but the CPU temps should rise 
> quickly.  That should give you a easy and definitive answer in just a 
> minute or so.
> 
> 
> Phil
> 
> PS- Nice to see our stuff at work at Fermilab! ;')
> 
> -------- Original Message --------
> Date: Thu, 29 Jul 2004 13:27:01 -0500 (CDT)
> From: Steven Timm <timm at fnal.gov>
> To: frodol at dds.nl, phil at netroedge.com, mdsxyz123 at yahoo.com
> Subject: xeontemp vs. adm1021
> Message-ID: <Pine.LNX.4.58.0407291316090.10290 at boxer.fnal.gov>
> MIME-Version: 1.0
> Content-Type: TEXT/PLAIN; charset=US-ASCII
> X-Quarentine-Loop: Processed
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> 
> 
> Hi Guys..
> 
> Was reading your documentation at
> 
> http://www2.lm-sensors.nu/~lm78/cvs/lm_sensors2/doc/chips/xeontemp
> 
> and
> 
> http://www2.lm-sensors.nu/~lm78/cvs/lm_sensors2/doc/chips/adm1021
> 
> My hardware, Supermicro X5DPA-GG motherboard,
> dual Xeon 2.66GHz 533 FSB chips,512kb L2 cache
> and
> dual Xeon 3.06GHz 533 FSB chips,512kb L2 cache
> 
> Running kernel 2.4.20-30.7smp from Redhat with
> lm_sensors 2.8.3 and i2c 2.8.3 modules loaded over top of it.
> 
> In modules.conf
> alias char-major-89 i2c-dev
> 
> sensors-detect finds the following:
> MODULE_0=i2c-i801
> MODULE_1=adm1021
> MODULE_2=w83781d
> MODULE_3=eeprom
> MODULE_4=smbus-arp
> 
> My question is the following:
> 
> The docs on xeontemp which I mention above say that 533 MHz
> xeons don't have the external sensor for the die temp.
> "unfortunately the 533 MHz FSB Xeons dropped the on-board sensor chip"
> 
> but the adm1021 docs say " If you have a Xeon and the adm1021
> module loads and both temperatures appear valid, then things are good"
> 
> In my case the adm1021 module does load, and I get this:
> 
> 
> root at fnpc151 root]# sensors
> max1617-i2c-0-18
> Adapter: SMBus I801 adapter at 0540
> Algorithm: Non-I2C SMBus adapter
> Board:       +47C  (low  =   -55C, high =  +127C)
> CPU:         +53C  (low  =   -55C, high =   +78C)
> 
> max1617-i2c-0-1a
> Adapter: SMBus I801 adapter at 0540
> Algorithm: Non-I2C SMBus adapter
> Board:       +48C  (low  =   -55C, high =  +127C)
> CPU:         +73C  (low  =   -55C, high =   +78C)
> 
> The CPU temperatures go up and down with CPU activity, as
> expected.
> 
> My question is--is this "CPU" temperature that I am
> reading out the temperature of the die?  The vendor
> is telling me that it is.  The documentation you have
> hints that it should be too, but I am just confused by
> the statement that 533MHZ FSB chips don't have this sensor.
> 
> At first with lm_sensors 2.6 we did not see the sensor
> but once we ran the sensors-detect from lm_sensors 2.8.3
> we could see it just fine and it appears to be functioning.
> 
> Is this sensor the die temperature?
> 
> Thanks for your help.
> 
> Steve Timm
> 
> 
> 
> 
> [root at fnpc151 root]# cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 3.06GHz
> stepping        : 9
> cpu MHz         : 3066.856
> cache size      : 512 KB
> physical id     : 0
> siblings        : 1
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
> bogomips        : 6121.06
> 
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 3.06GHz
> stepping        : 9
> cpu MHz         : 3066.856
> cache size      : 512 KB
> physical id     : 0
> siblings        : 1
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
> bogomips        : 6121.06
> 
> 
> ------------------------------------------------------------------
> Steven C. Timm, Ph.D  (630) 840-8525  timm at fnal.gov 
> http://home.fnal.gov/~timm/
> Fermilab Computing Division/Core Support Services Dept.
> Assistant Group Leader, Scientific Computing Support Group
> Lead of Computing Farms Team
> 
> 



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