Incomplete. It appears we're both experiencing just bug 1447896 now. Bug
1377872 hasn't definitely been seen since late-2014.
** Changed in: mir
Status: Confirmed => Incomplete
** Changed in: mesa (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1377872
Title:
Double-buffered compositing performance is sometimes very poor (30
FPS) on intel
Status in Mesa:
Confirmed
Status in Mir:
Incomplete
Status in mesa package in Ubuntu:
Incomplete
Bug description:
Double-buffered compositing performance is sometimes artificially poor
on some intel systems. When this happens the frame rate seen is halved
- about 30 FPS. However at the same time, Mir is observed to use very
little render time and both the CPU and GPU are still mostly idle.
It's just the Intel DRM logic sometimes takes two frames (~32ms) to
complete a single page flip.
Two known workarounds avoid the issue:
(a) Add glFinish() into the mesa DisplayBuffer code; or
(b) env INTEL_DEBUG=sync for the Mir server binary.
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