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

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #23 from Barto (mister.freeman@laposte.net) ---
so here is the output of "cat /sys/kernel/debug/dri/0/ttm_dma_page_pool" when
no youtube video are played ( firefox is not running ), with kernel 4.15rc8 :


         pool      refills   pages freed    inuse available     name
           wc         1682             0     1344     5384 radeon 0000:01:00.0
       wchuge         1130          4514        0        6 radeon 0000:01:00.0
       cached       106272        424533      552        3 radeon 0000:01:00.0
   cachedhuge            6            18        0        6 radeon 0000:01:00.0

and now with firefox running, youtube video hd@60 fps in full screen mode (
output given by my bash script running in background ) :

         pool      refills   pages freed    inuse available     name
           wc         1682             0     2089     4639 radeon 0000:01:00.0
       wchuge         3012         12042        3        3 radeon 0000:01:00.0
       cached       113562        453693      552        3 radeon 0000:01:00.0
   cachedhuge            7            24        0        4 radeon 0000:01:00.0


I made another expirement : using a different web-browser :

- If I use chromium 63.0.3239.132 ( a web browser based on chrome ) then there
is no bug, playback is 100% fluid, no lags, it's perfect,

- If I use opera 50.0 then there is a bug, like firefox 57, I get lags, the
only difference is that I get a vsync problem ( tearing ) 

so it seems that your commit breaks something on applications like web-browsers
if they use a precise technic for rendering streaming video ( related to memory
management ? ), 

chromium seems to be the only web-browser which is not affected by your commit

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