Comment # 4
on bug 83012
from Eero Tamminen
(In reply to comment #3) > Why don't we disable vsync by default? > I think that's what proprietary drivers do. Because that's relevant only for benchmarks. Normal applications want to present user complete (non-tearing) frames. Note: with DRI2, using fullscreen with vsync off causes X to do copy of every frame (which has clear performance penalty for memory bandwidth bound benchmarks). With DRI3, when Vsync is disabled on client side, the X side copy is done only every Vsync, but currently you would need quad buffering to avoid stalling from X server side synching, which isn't what Mesa does (see bug 79715). (If you're very close, but not quite at 60 or 30 FPS, this non-Vsync induced copy can cause your FPS even to slightly decrease compared to Vsync.)
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