[Bug 109830] CPU iowait higher when run the GPU multi decoding threads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109830

--- Comment #20 from Owen Zhang <owen.zhang at intel.com> ---
(In reply to Chris Wilson from comment #18)
> If you s/io_schedule_timeout/schedule_timeout/ inside i915.ko and the iowait
> remains... The iowait itself is nothing to do with us and we are just a
> victim; merely a symptom -- and in all likelihood that iowait goes down is
> indicative that _we_ regressed and are preventing the system from waiting
> for io elsewhere by keeping it busy instead.

from my test, the change io_schedule_timeout to schedule_timeout in drm-tip, it
can see the iowait value changes to down, but can't work on linux 4.19.

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