[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 #30 from Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> ---
(In reply to Owen Zhang from comment #27)
> Hi，
> 
> i have made the following changes on kernel 4.19:
> 
> 1) apply the following patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/
> ?h=linux-4.20.y&id=0a2fff2428f1e175932dc3cf115b68c868e3a839

This patch makes a difference on it's own? How much?

If it does, I think you have to test by ensuring input data is cached before
the timing run, and dump the output to /dev/null.

Otherwise you are accounting for the changes in kernel's block and filesystem
subsystems as well.

P.S. I haven't had the time yet to try the repro using the latest instructions.

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