[clug] Sensors

[Eyal Lebedinsky]

On 30/12/18 9:24 pm, Bryan Kilgallin via linux wrote:
> Dear Eyal:
> 
>> I have no idea what HardInfo is, but each core, as well as the whole CPU package, has a different temperature.
> 
> Synaptic Package Manager says this.
> {HardInfo is a small application that displays information about your
> hardware and operating system. Currently it knows about PCI, ISA PnP, USB, IDE, SCSI, Serial and parallel port devices.}
> 
>> I use 'sensors' to see the details.
> That reports thus.
> 
> {radeon-pci-0100
> Adapter: PCI adapter
> temp1:        +60.0°C
> 
> coretemp-isa-0000
> Adapter: ISA adapter
> Core 0:       +38.0°C  (high = +78.0°C, crit = +100.0°C)
> Core 1:       +40.0°C  (high = +78.0°C, crit = +100.0°C)}
> 
> Then I read that PCI was a bus.
> 
> {Conventional PCI, often shortened to PCI, is a local computer bus for attaching hardware devices in a computer. PCI is the acronym for Peripheral Component Interconnect[2] and is part of the PCI Local Bus standard. The PCI bus supports the functions found on a processor bus but in a standardized format that is independent of any particular processor's native bus. Devices connected to the PCI bus appear to a bus master to be connected directly to its own bus and are assigned addresses in the processor's address space[3]. It is a parallel bus, synchronous to a single bus clock.}
> 
> https://en.wikipedia.org/wiki/Conventional_PCI
> 
>> It is not always correct but has mostly useful information.
> 
> Is the PCI bus hotter than the CPU cores, because of poorer ventilation?

Different parts normally run at different temperatures. There is no logic
to comparing the temp of one device to another.

> And does running my PC on a hot day harm it?

Unlikely. However, if the ventilation is not working properly, like a stuck laptop fan,
the system may shut down. As for the CPU, the operating system is likely to slow it down
if is too hot (over the 'crit' listed above).

Here is an example from my server log:
Feb 19 21:00:05 e7 kernel: CPU5: Core temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU1: Core temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU0: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU6: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU4: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU2: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU1: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU3: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU7: Package temperature above threshold, cpu clock throttled (total events = 1)
Feb 19 21:00:05 e7 kernel: CPU1: Core temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU4: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU6: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU2: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU1: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU0: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU7: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU3: Package temperature/speed normal
Feb 19 21:00:05 e7 kernel: CPU5: Core temperature/speed normal

I since removed the fan, cleaned the CPU and the fan plate then applied fresh thermal paste. It is an old machine
which was running 24/7 for over 6 years.

-- 
Eyal at Home (eyal at eyal.emu.id.au)