Comment # 5 on bug 79842 from Marek Olšák

(In reply to Grigori Goronzy from comment #4)
> Probably related to this:
> 
> http://cgit.freedesktop.org/mesa/mesa/commit/?h=10.
> 1&id=1ba2298131924daf34b4504ba748a782c5189f48
> 
> Anisotropic filtering was broken in radeonsi, and that fixed it. Anisotropic
> filtering has some overhead, which explains the slightly reduced performance.
> 
> This patch was applied to 10.1 and 10.2 branches as well as master.

Makes sense. Anisotropic filtering can indeed decrease performance a lot.
Closing.