[Bug 84648] Lag/Pause When VRAM->GTT or GTT->VRAM transfer occur

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84648

--- Comment #10 from jochen <moebius282 at gmail.com> ---
https://bugs.freedesktop.org/show_bug.cgi?id=89203 is probably a duplicate of
this bug.

I tested it with linux 3.19 and different (git~51b43c5, 10.4.6, 10.3.5) mesa
versions, but they don't seem to make a difference. So, no,
a338dc01866ce50bf7555ee8dc08491c7f63b585 does not help. Even with mesa 10.3.5,
where some people reported this was the the last working version for them, the
hangs occured. So it's probably related to some kernel issue, too.

The hangs only seem to occur ( at least surface ) on Minecraft 1.8+. Probably
because that was a bigger update and they changed the rendering code
significantly. The hangs occur every few seconds and freeze the screen for <5s.
Unfortunately I get a similiar issue with FTB/modded Minecraft 1.7. But this
time the game itself runs fine, but whenever I switch the virtual workspace in
my window manager (awesomewm), it takes up to several *minutes* until the
system reacts again and the screen is updated. This only happens if the game
was running for some time -> probably more vram/gtt usage. Even the cursor
freezes. Big annoyance.

The testing was done on a HD5850, so r600g is affected, too.

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