30 FPS for glxgears with decent GPU

[avitase]

Hi,

I have an AMD 5700XT installed and get surprisingly low frame rates ~30 FPS with glxgears. I know that this is not the right tool for benchmarking, anyhow, 30 FPS is well below the monitor refresh rate (I guess?).

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#  glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
601 frames in 5.0 seconds = 119.773 FPS
151 frames in 5.0 seconds = 30.004 FPS
152 frames in 5.0 seconds = 30.209 FPS
151 frames in 5.0 seconds = 30.005 FPS
151 frames in 5.0 seconds = 30.010 FPS
151 frames in 5.0 seconds = 30.008 FPS
151 frames in 5.0 seconds = 30.005 FPS
151 frames in 5.0 seconds = 30.012 FPS
151 frames in 5.0 seconds = 30.007 FPS
151 frames in 5.0 seconds = 30.008 FPS
151 frames in 5.0 seconds = 30.008 FPS
151 frames in 5.0 seconds = 30.007 FPS
151 frames in 5.0 seconds = 30.005 FPS
151 frames in 5.0 seconds = 30.011 FPS
151 frames in 5.0 seconds = 30.004 FPS
151 frames in 5.0 seconds = 30.011 FPS
151 frames in 5.0 seconds = 30.008 FPS

This short spike for the first 5s happens reproducible, but I don't know, whether this is an artefact of glxgears.
I followed the AMDGPU Gentoo Wiki as close as possible and since I have no APU unit in my CPU and due to the fact, that the monitor is plugged into my graphic card directly (not the mainboard) I am pretty sure that I am indeed benchmarking the right device.
I am running the 5.4.28 kernel, mesa 19.3.5 and loaded the AMD device driver as a module:

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#  lsmod
Module                  Size  Used by
br_netfilter           28672  0
amdgpu               3887104  6
mfd_core               16384  1 amdgpu
gpu_sched              32768  1 amdgpu
ttm                    90112  1 amdgpu
efivarfs               16384  1

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# cat /etc/portage/make.conf | grep -i video_cards
VIDEO_CARDS="amdgpu radeonsi"

I am using the i3wm, in case this is important...

Any ideas / comments?

[Zucca]

Check if your monitor isn't really running on 30Hz mode:

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xrandr

.

EDIT: Also check if your GPU isn't limited by some other way:

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vblank_mode=0 glxgears

... and you should see fps numbers in thousands in smaller window.

[avitase]

thanks for your help. You are right! Sorry for that.

This is strange, I know that my monitor can run 3440x1440 @ 60Hz... Any idea why this is not listed below? The monitor is connected via DP -> HDMI cable, but I don't see why this should be an issue?

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# xrandr
Screen 0: minimum 320 x 200, current 3440 x 1440, maximum 16384 x 16384
DisplayPort-0 disconnected primary (normal left inverted right x axis y axis)
DisplayPort-1 connected 3440x1440+0+0 (normal left inverted right x axis y axis) 798mm x 335mm
   3440x1440     29.99*
   1720x1440     60.00
   1920x1080     60.00    60.00    50.00    59.94
   1600x1200     60.00
   1280x1024     75.02    60.02
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)

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vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
91116 frames in 5.0 seconds = 18223.127 FPS
91199 frames in 5.0 seconds = 18239.607 FPS
91503 frames in 5.0 seconds = 18300.578 FPS

Edit: I just checked the refresh rate of my monitor with windows: 30Hz. I have other problems - sorry for the noise and thanks for your help!

[Goverp]

Have you got your monitor configured for interlaced instead of progressive? That halve the frame rate - or more exactly the screen only writes half a frame at each update.

[Ant P.]

You need a cable rated for HDMI 2.0 or higher.

[NeddySeagoon]

avitase,

3440 x 1440 at 60Hz is more that HDMI 1 can support.
You need HDMI 2 compatible equipment both ends. An HDMI 1 cable might work. The connectors are identical but the timing tolerances on the signals are tighter for HDMI 2.

With HDMI 1, its working as expected.

[avitase]

thanks for the help. I wasn't aware of that. Changing cables actually helped! Sorry for the noise

[Zucca]

Sorry for the noise

Don't be sorry. This is (primarily) why these forums have been set up - to help others with problems related to Gentoo and other things close to it.

[NeddySeagoon]

avitase,

We would all hate for you not having the best possible Gentoo experience that your equipment can provide.
A 30Hz refresh rate is horrible. Its better on an LCD than a CRT though.