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Re: AMD EPYC throttled to 400 mhz

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On 17.01.2022 18:40, Simon Kainz wrote:
>
> Am 17.01.22 um 11:36 schrieb Alexander V. Makartsev:
>> 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?
> Good point, but no, because the system is under heavy load all the time,
> not idling.
> After throttling down to 400 mhz, system also stays at this speed. Only
> system reboot mitigates the issue.
>
>> What CPU driver and Governor currently in use?
>> https://www.kernel.org/doc/html/latest/admin-guide/pm/working-state.html
> #CPU driver:
>
> root@node3:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
> acpi-cpufreq
>
> #Governor:
> root@node3:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> schedutil
>
> I did not set/change governor/driver settings, this is a stock debian
> kernel.
Is the server platform runs latest BIOS and firmware?
Things I'd try first if I was in your place.
I always flash latest firmware available as a pre-sale procedure, or 
during server installation.

I've also found this bug report¹ . Could be the same issue with scaling 
driver, which was fixed in kernel 5.11.
Debian stable runs version 5.10.84, so test the system with newer kernel.


¹ https://bugzilla.kernel.org/show_bug.cgi?id=211305

-- 
With kindest regards, Alexander.

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AMD EPYC throttled to 400 mhz Simon Kainz <simon@familiekainz.at> - 2022-01-17 11:00 +0100
  Re: AMD EPYC throttled to 400 mhz "Alexander V. Makartsev" <avbetev@gmail.com> - 2022-01-17 11:40 +0100
    Re: AMD EPYC throttled to 400 mhz Simon Kainz <simon@familiekainz.at> - 2022-01-17 14:50 +0100
      Re: AMD EPYC throttled to 400 mhz "Alexander V. Makartsev" <avbetev@gmail.com> - 2022-01-17 18:10 +0100
        Re: AMD EPYC throttled to 400 mhz Andrei POPESCU <andreimpopescu@gmail.com> - 2022-01-22 08:30 +0100
      Re: AMD EPYC throttled to 400 mhz didier gaumet <didier.gaumet@gmail.com> - 2022-01-17 18:50 +0100
      Re: AMD EPYC throttled to 400 mhz Mike Kupfer <mkupfer@alum.berkeley.edu> - 2022-01-17 23:20 +0100
        Re: AMD EPYC throttled to 400 mhz Simon Kainz <simon@familiekainz.at> - 2022-01-18 08:30 +0100
  Re: AMD EPYC throttled to 400 mhz Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-18 04:30 +0100

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