<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB/IVB DRI3] OSD's from Gnome-shell hangs or crashes the Intel driver" href="https://bugs.freedesktop.org/show_bug.cgi?id=76321#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB/IVB DRI3] OSD's from Gnome-shell hangs or crashes the Intel driver" href="https://bugs.freedesktop.org/show_bug.cgi?id=76321">bug 76321</a> from <a class="email" href="mailto:martin.kamleithner@gmail.com" title="martin.kamleithner@gmail.com">martin.kamleithner@gmail.com</a> <pre>(In reply to Eero Tamminen from <a href="show_bug.cgi?id=76321#c18">comment #18</a>) > Main performance difference between DRI2 & DRI3 should come only in > synthetic benchmarks where you go much over 60 FPS, with Vsync it should not > be visible to user. That was about memory overhead and how perf is visible > to the application. > > There are also differences in how frames get to screen after application has > rendered them to the double/triple buffer. You are right, the performance difference is not from DRI2 vs DRI3, but from SNA vs UXA: Switching back to UXA brings back good performance, but reintroduces the bug. The performance drop is not 100% reproduceable, it only happens on fullscreen and only sometimes with various games (E.g. Binding of Isaac:Rebirth, Super Hexagon), but when it happens, it is very noticeable (below 30 fps). I don't know how to measure fps on Linux, but the fps drop is definitely there.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>