I'm running software that overloads disk IO sometimes. I don't need fast response from that software, I need fast response from other applications, so I could set low process priority for that. I want to ask how process priority affects disk IO priority for a process.
I tried a small experiment: I set low priority (in System Monitor under GNOME) for a process and checked IO priority with
IO priority = 0 for normal process priority
IO priority = 4 for low process priority
But will this always work like this? Is IO priority always reduced when I reduce process priority?