[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 #19 from Owen Zhang <owen.zhang at intel.com> ---
(In reply to Tvrtko Ursulin from comment #17)
> What is the good iowait in percentage?
> 
> I don't have vaapi installed - it looks I incorrectly assumed the reproducer
> is self contained? I still need to build the stack from #1?
> 
> Can you try with drm-tip? With schedule_timeout I get iowait of 0% for
> simulated media pipelines. :)

from our test on kenrel 4.4, the iowait is around 60% in average for whole
media process. for kernel 4.19, the iowait is 90%+.

our reproducer hasn't included vaapi binary, so Is it possible give your ip
address, i can remote to check your env? and i will upload this later.

yes, i try on drm-tip with schedule_timeout, the iowait will reduce to around
60%. but i think the Chris's patch also can fix this.
drm/i915: Replace global breadcrumbs with per-context interrupt tracking


BTW, you may need the following cmd to see the full changes when run the media
pipelines.
iostat -x 1 120

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