[Bug 99967] RX 480 sclk clock speed lowers when under load

[Bug 99967] RX 480 sclk clock speed lowers when under load

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99967

            Bug ID: 99967
           Summary: RX 480 sclk clock speed lowers when under load
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: haagch@frickel.club

Created attachment 129917
  --> https://bugs.freedesktop.org/attachment.cgi?id=129917&action=edit
screenshot with echo manual > power_dpm_force_performance_level

My GPU is the factory overclocked XFX Radeon RX 480 XXX OC, this might have
something to do with it.

I noticed this on agd5d/drm-next-4.12-wip and found similar behavior on 4.10,
4.9 and 4.8.

It's even affected even with echo manual >
/sys/class/drm/card0/device/power_dpm_force_performance_level

I've made a screenshot of radeon-profile on linux 4.8.14 and annotated it.

Steps I took:
echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo 7 > /sys/class/drm/card0/device/pp_dpm_sclk
then started unigine-heaven, closed it, waited a couple of seconds, started
furmark, closed it, waited a couple of seconds and then ran another echo 7 >
/sys/class/drm/card0/device/pp_dpm_sclk

When the GPU is "relatively" idle (just displaying the desktop with a browser,
etc.) this doesn't happen. I can echo any number in
/sys/class/drm/card0/device/pp_dpm_sclk and it sticks.
But when I start applications that put some stress on the GPU, the sclk clock
lowers - and stays on a lower level even when the load is gone, until another
number is echo'ed into /sys/class/drm/card0/device/pp_dpm_sclk

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[Bug 99967] RX 480 sclk clock speed lowers when under load

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99967

--- Comment #1 from Christoph Haag <haagch@frickel.club> ---
Created attachment 129918
  --> https://bugs.freedesktop.org/attachment.cgi?id=129918&action=edit
screenshot with echo auto > power_dpm_force_performance_level

On "auto" the sclk clock speeds resets by itself properly, but the clock speed
under load is not raised to the levels where it should be, for example when
running furmark all bars in radeontop show >95% load, yet the sclk is at level
1: 608Mhz.

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[Bug 99967] RX 480 sclk clock speed lowers when under load

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https://bugs.freedesktop.org/show_bug.cgi?id=99967

--- Comment #2 from Christoph Haag <haagch@frickel.club> ---
Created attachment 129919
  --> https://bugs.freedesktop.org/attachment.cgi?id=129919&action=edit
dmesg with linux 4.8

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[Bug 99967] RX 480 sclk clock speed lowers when under load

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https://bugs.freedesktop.org/show_bug.cgi?id=99967

--- Comment #3 from Christoph Haag <haagch@frickel.club> ---
Some more experimentation:

The SaschaWillems Vulkan examples that cause a lot of gpu load (like
computecullandlod) make the GPU run at the highest performance level.

McNoppers OpenGL Example30 (raytracing with compute shaders) does the same.

But Furmark still only makes the GPU run at 600-900 MHz.

So most likely the cause is NOT in X or the general handling of one of the
graphics APIs and most likely it is not a general power supply issue.

It could be that it only happens when certain hardware parts of the GPU are
under high load, or are not under high load.

On IRC some people tried furmark and could not reproduce this behavior. (The
user Remco with a factory overclocked XFX RX 480 too, though a different model
than mine).

This is good news for the driver developers. This is not so good news for me
because now I have to find out whether it's bad hardware (mainboard, GPU?) on
my part or something in my software configuration.

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[Bug 99967] RX 480 sclk clock speed lowers when under load

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https://bugs.freedesktop.org/show_bug.cgi?id=99967

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #4 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/145.

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