On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:

>> Those accesses might not stop with just the display off - some
>> applications may keep redrawing.
Will these accesses cause iGPU or dedicated GPU accesses to the DRAM? I think 
that those redrawings originate from the processor.

>I'm not sure a graphical benchmark will run without a graphical system
>running?
Yes, VLC is one of the benchmarks and will not run without GUI.
You can start system with plain X and twm for window manager - this would 
produce minimal load on the GPU.
However, I would have expected that VLC would produce a lot GPU/iGPU 
accesses even without drawing anything, because it would try to use GPU 
decoder.
Displaying video is also often done using GL or Xvideo - plain X is too 
slow for this.
>Maybe do the reverse of what I suggested. Run the benchmark but send
>the output to a remote display.
Will it avoid screen activation in the local machine?
There should be a rather drastic difference in speed between VLC 
displaying locally and in a remote X using network.
best

Vladimir Dergachev

>Since IMC counters appear to be a feature of the powerpc architecture,
>you might get a better response from some list/forum specific to that
>architecture.

IMC stands for the Integrated Memory Controller. The DRAM controller has some 
internal counters for counting different types of memory accesses. For example, 
for my laptop it is documented here:
https://software.intel.com/content/www/us/en/develop/articles/monitoring-integrated-memory-controller-requests-in-the-2nd-3rd-and-4th-generation-intel.html

Do you have any suggestions about the cause of the xrandr error? It works 
perfectly in the virtual machine!



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