https://bugs.kde.org/show_bug.cgi?id=238331

--- Comment #5 from Russell Haley <yumpusamongus+...@gmail.com> ---
(In reply to Andrew Crouthamel from comment #4)
>So that is the cycles of the CPU unusable for calculations, and thus 
>considered "used".

I/O wait does not make the CPU unusuable for other calculations.  It's just
idle time that happens when some I/O request is in flight. Try running my
reproducer script from https://bugs.kde.org/show_bug.cgi?id=465768 and "stress
-c $(nproc)" at the same time.  Top will show 100% userspace utilization from
the stress command, *and* the disk reads will continue at full speed.

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