VM niceness high priority


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i just deployed a gaming VM as i wanted to merge my NAS and my desktop computer using unraid.


When i doing some ffmpeg video encodings on the host running on docker even with nice set as lowest priority the vm get completely unusable, also tried put VM with highest nice using renice.


I don't want to pin cpu as some times i will need the performance on the vm and some times on the host. so for me best solution is to use the nice but seems not working. 

If i run the ffmpeg on the VM all works fine and i can use the vm fluent even is fully loaded because the ffmpeg.

So needs to be something related with cpu resources in linux and the VM.
Any idea? 


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