[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #22 from Barto (mister.freeman at laposte.net) ---
(In reply to Christian König from comment #21)

> Best approach would be to gather the "while you play the video" numbers from
> a separate system over ssh, because when you put the firefox window into the
> background it can change the results.

I have already use a special technic in order to be able to get the infos while
playing a video, I use a bash script with an "infinite while loop", which can
allow me to put in fullscreen mode the video while the script will generate the
log files :

#!/bin/bash

i="0"
j="0"

while [ $i -lt 4 ]
do
sleep 1
echo $j
cat /proc/meminfo > log_$j.txt
j=$[$j+1]
done

I tried to rebuild kernel 4.15rc8 with the option "CONFIG_SWIOTLB" disabled,
the bug is still here

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