On Oct 26, 2010, at 7:15 AM, Jean Delvare <khali@xxxxxxxxxxxx> wrote:
Hi Clemens,
On Tue, 26 Oct 2010 15:53:29 +0200, Clemens Ladisch wrote:
Jean Delvare wrote:
Doh. You are aware that Core i7 CPUs are made by Intel and
Family 10h
(aka K10) CPUs are made by AMD, aren't you? They are different CPU
models, they don't have to be designed the same way.
I know that :)
I thought maybe that is a standard and each cpu temperature must
be show
separetly.
There is no such standard.
And on the newest CPUs, Intel has switched to one temperature
sensor per
package.
Really? Starting with which CPU model?
On Tue, 26 Oct 2010 06:06:53 -0700 (PDT), Mahmood Naderan wrote:
One more question, Is it possible to find out which two modules
are tied to one
processor?
Modules?
I suspect he has Magny Cours processors. They are multi-chip modules
with two CPU chips per package. /proc/cpuinfo will tell you which
cores are in which sockets.
Is it true that [00c3 and 00cb] are for one physical cpu and
[00d3 and 00db] are
for the other cpu?
I conclude from this question that you have two CPUs, and that each
CPU
has two temperature sensors.
The temperature sensor is part of the PCI device that associated with
the CPU's internal northbridge. IIRC the six-core CPUs have two
northbridges, for whatever technical reason, so they present two
temparature sensors to the OS.
It looks as if the two sensors in each CPU have the same value. Is
this
always the case?
(I don't know where the c3/cb/d3/db names come from.)
This is the PCI bus number in compact hexadecimal form:
00:18.3 -> 00c3
00:19.3 -> 00cb
00:1a.3 -> 00d3
00:1b.3 -> 00db
We had to find a unique ID to differentiate between them, and that ID
had to fit in an int to make libsensors happy.
All entries in cpuinfo look the same, so I can't explain why some
have
the critical limit and some don't.
The limit is set by the BIOS. I'd guess the BIOS knows that two
sensors
are actually the same, an so doesn't bother to set the limit on the
superfluous ones.
I'll look into the datasheet to see if this situation (two
northbridges
per CPU) is documented and can be detected so that the driver can
ignore
these superfluous sensors.
If these sensors exist, I see no valid reason to ignore them. Two
sensors can be useful, to slightly increase the resolution by
combining
them, or simply in case one of them get unreliable for whatever
reason.
If these are Magny Cours, then they are definitely different sensors
and they come from the different CPU chips in the package. If you ran
a load on only one CPU chip:
$ numactl --cpunodebind=0 mprime -b4 -t
You should see the temperatures diverge for the sensors in the same
socket.
Phil P.
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