linux-kernel - Re: k10temp show over 100 degrees temperature on EPYC Milan servers from DELL and SMC

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Date:   Thu, 20 Apr 2023 07:32:51 +0200
From:   Jinpu Wang <jinpu.wang@...os.com>
To:     "Limonciello, Mario" <Mario.Limonciello@....com>
Cc:     "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "clemens@...isch.de" <clemens@...isch.de>,
        Guenter Roeck <linux@...ck-us.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: k10temp show over 100 degrees temperature on EPYC Milan servers
 from DELL and SMC

On Wed, Apr 19, 2023 at 3:33 PM Limonciello, Mario
<Mario.Limonciello@....com> wrote:
>
> [Public]
>
> Hi,
>
> > Dear experts on the list,
> >
> > We've noticed many of our EPYC Milan servers from different vendors
> > (DELL  and SMC) show 100 degrees, eg
> >
> > sudo sensors
> > k10temp-pci-00c3
> > Adapter: PCI adapter
> > Tctl:        +117.5°C
> > Tdie:        +117.5°C
> > Tccd1:        +67.0°C
> > Tccd2:        +65.2°C
> > Tccd3:        +63.2°C
> > Tccd4:        +63.8°C
> > Tccd5:        +67.2°C
> > Tccd6:        +63.5°C
> > Tccd7:        +64.2°C
> > Tccd8:        +64.8°C
> >
> >  sudo lscpu
> > Architecture:                    x86_64
> > CPU op-mode(s):                  32-bit, 64-bit
> > Byte Order:                      Little Endian
> > Address sizes:                   48 bits physical, 48 bits virtual
> > CPU(s):                          128
> > On-line CPU(s) list:             0-127
> > Thread(s) per core:              2
> > Core(s) per socket:              64
> > Socket(s):                       1
> > NUMA node(s):                    1
> > Vendor ID:                       AuthenticAMD
> > CPU family:                      25
> > Model:                           1
> > Model name:                      AMD EPYC 7713P 64-Core Processor
> > Stepping:                        1
> > Frequency boost:                 enabled
> > CPU MHz:                         2479.705
> > CPU max MHz:                     3720,7029
> > CPU min MHz:                     1500,0000
> > BogoMIPS:                        3992.43
> > Virtualization:                  AMD-V
> > L1d cache:                       2 MiB
> > L1i cache:                       2 MiB
> > L2 cache:                        32 MiB
> > L3 cache:                        256 MiB
> > NUMA node0 CPU(s):               0-127
> >
> > We've seen such high temperatures even on  idle servers.
> >
> > We are running LTS kernel 5.10.136, but checking the git history for
> > k10temp driver, I don't find any missing fix.
> > My questions are:
> > 1. Is it normal to have such high temperatures for tctl?  can we trust
> > the value?
> > 2  Do we need to worry about such high temperatures?
> >
> > Thx!
> > Jinpu Wang @ IONOS Cloud.
>
> It's fixed by this patch that will be going into 6.4.
> https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git/commit/?h=hwmon-next&id=1dc8e097967b69a56531c9ccb70b854771310e85

Hi,

I tested on affected server, the tctl output looks normal now.

Thx for quick reply.
>
> Guenter,
>
> If you didn't already send your 6.4 PR, can you please add
> Cc: stable@...r.kernel.org to the patch in your tree?
>
> Thanks,