<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [IVB/HSW/BYT-M/BDW] GpuTest_v0.5_triangle is slower by 10%~50% in fullscreen than in windowed & composited mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=80705#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [IVB/HSW/BYT-M/BDW] GpuTest_v0.5_triangle is slower by 10%~50% in fullscreen than in windowed & composited mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=80705">bug 80705</a> from <a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> Eero Tamminen</a> <pre>According to Mengmeng, this issue happens only with DRI3, not DRI2. Can you check with intel_gpu_top (on BYT where it works fine) what is the "render" value both in fullscreen and windowed mode? I.e. is GPU 100% utilized in both cases, like it's with DRI2. FYI: In an unrelated test it was noticed that with DRI3, X still does occasionally Vsync wait although test had zeroed swap interval. According to Chris' comment on that test: --------- The current implementation requires 4 buffers to run the entire pipeline in an synchronous manner, Keith is only feeding in 3 (from mesa/src/glx/dri3_glx.c) and so forces the synchronization. --------- -> With Vsync, test wouldn't be using GPU fully.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>