Fix committed into lp:compiz at revision 3370
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https://bugs.launchpad.net/bugs/1037411
Title:
[regression][DRI] SubBuffer rendering is much slower in compiz 0.9.8.0
than it was in 0.9.7
Status in Compiz:
Fix Committed
Status in Mesa:
Confirmed
Status in “compiz” package in Ubuntu:
Triaged
Status in “mesa” package in Ubuntu:
Triaged
Status in “compiz” source package in Precise:
Invalid
Status in “mesa” source package in Precise:
Invalid
Status in “compiz” source package in Quantal:
Triaged
Status in “mesa” source package in Quantal:
Triaged
Bug description:
(This is no longer the primary performance regression bug for compiz
0.9.8.0. Look at bug 1024304 instead)
TEST CASE:
1. CCSM > OpenGL >
framebuffer_object = OFF
vertex_buffer_object = OFF
always_swap_buffers = OFF
2. Run graphics benchmarks.
Expected: Similar results to compiz 0.9.7
Observed: Much lower results than compiz 0.9.7
ORIGINAL DESCRIPTION:
Comparing graphics performance in a two-monitor configuration, I find the
gles2 branch is 25-40% slower than trunk.
This would not normally be surprising, however the slowdown REMAINS
even when I turn off the new rendering features in the gles2 branch:
framebuffer_object, vertex_buffer_object, always_swap_buffers
So both branches should be using the same code path. But gles2 is
still dramatically slower than trunk using two monitors.
The good news is that this bug only affects benchmark results and
seemingly a little lag. The physical frame rate achieved with two
monitors still seems to be higher using the gles2 branch, meaning it
drops from 60Hz to 30Hz much less often than trunk does.
NOTE 1: This regression was allowed in compiz 0.9.8.0 because it is
generally only visible in benchmark results. Meanwhile, physical
compiz rendering performance (as reported by the compiz Benchmark
plugin) is higher in compiz 0.9.8.0 than previous versions, in most
cases.
NOTE 2: If you're just worried about fullscreen game performance, then
you don't need to wait for this bug to be resolved. You can get
optimal graphics performance with unredirect mode. But see bug 980663
first.
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