Re: AMD EPYC throttled to 400 mhz

["Alexander V. Makartsev" <avbetev@gmail.com>]

On 17.01.2022 14:41, Simon Kainz wrote:
> Hello,
>
> we are experiencing spontaneous CPU speed throttlings.
>
> System is a Lenovo  ThinkSystem SR645 with 2
> AMD EPYC 7452 32-Core Processor, running
>
> Linux node3 5.10.0-10-amd64 #1 SMP Debian 5.10.84-1 (2021-12-08) x86_64
> GNU/Linux
>
> After some time (hours, day, weeks even) the system suddenly gets
> throttled to 400 Mhz (see below)
>
> HW Vendor replies with "Debian ist not on the supported OS" list, so we
> are currently fighting on our own.
>
> Does someone else experince the same/similar issue? It seems to my as
> some kind of thermal throttling, but kernel does not log thottling
> events. Maybe some Debian-specific kernel setting, that influences CPU
> throttling..
Are you sure it is not due to a "power save" feature for a system under 
low load?
What CPU driver and Governor currently in use?
https://www.kernel.org/doc/html/latest/admin-guide/pm/working-state.html

Is the CPU temperature ok?
Since this is a server platform, it could be due to wrong installation 
of FANs/Radiators/Air ducts and shields/etc.
Check it with "sensors".

--
With kindest regards, Alexander.

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