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1b1ed1a
(Get the code!)
Thanks for the reply, Aaron.
The dmesg.log file is already attached above.
Your ffmpeg example is on the simple side compared to the pipeline that creates the issue for me, where ffmpeg has multiple inputs and a pipeline that touches both the GPU and the CPU. For simple things it works okay here as well.
intel_gpu_top spikes to 100% on both Render/3D and Compute with very brief interruptions, probably while it moves the frame for processing by the CPU. Blitter, Video, and VideoEnhance remains at 0%.
/proc/cpuinfo shows CPU comfortably alternating between 400MHz and 4GHz, apparently with plenty to spare and confirming the previous output provided by iostat and top in the original report above.
sensors output shows the temperature for all CPUs comfortably under 70 degrees at all times, with almost all of them under 60.