https://bugs.freedesktop.org/show_bug.cgi?id=84627
--- Comment #14 from smoki smoki00790@gmail.com ---
Revert is upstreamed with commit http://cgit.freedesktop.org/mesa/mesa/commit/?id=7b4276d7acf2e0f77044cb50caa..., i am now in corruption enviroment :) Good is only that -mtune=generic now works OK performance wise.
So on top of that, only if i disable all RADEON_FLAG_GTT_WC lines in r600_buffer_common.c corruption goes away.