This bug was finally resolved with updates to sdl, used by all the games
I saw it in. When I first changed repos to move to Utopic Unicorn, a new
SDL package returned both Critter and Scorched3d to full performance.
Then another update reverted some change, and performance fell right
back to where it had been. Finally a 3ed update fixed it again,
hopefully for good.
libsdl1.2debian_1.2.15-8ubuntu2_amd64.deb brought the original fix
libsdl1.2debian_1.2.15-9ubuntu1_amd64.deb rolled it back
libsdl1.2debian_1.2.15-9ubuntu2_amd64.deb fixed it for good, had this changelog
entry:
libsdl1.2 (1.2.15-9ubuntu2) utopic; urgency=medium
* Restore accidentally-clobbered changes from 1.2.15-8ubuntu2.
[ Timo Jyrinki ]
* debian/patches/sdl-check-for-SDL_VIDEO_X11_BACKINGSTORE.patch:
- Restore old backingstore behavior to prevent tearing
(LP: #1280665)
Had to revert HUNDREDS of packages one at a time to find this! Any kind of
anti-tearing behavior can be resource intensive, I've never had tearing
problems in games with r600 but do need to use vsync with video players.
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https://bugs.launchpad.net/bugs/1293314
Title:
Severe performance regression with xserver 1.15
Status in “xorg-server” package in Ubuntu:
New
Bug description:
With Xserver 1.15, OpenGL performance in all games is reduced by
almost half, at least with both Radeon/r600g driver Not sure which
actual package has the issue. As long a hyper-z is explicitly
enabled, mesa version 10.2 (from oibaf PPA) does not change this
regression. With hyper-z disabled (the new default) another 10-20%
reduction in performance resulted after an approximately 40% loss from
the new x server.
Critter still ran faster than the screen refresh rate, so it was not a
matter of vblank sync being enabled due to any effect of the dri3
transition on an unchanged ~/.drirc . I am still wondering, however,
if the DRI3 transition is the source of this severe performance loss.
Package tested:
xserver-xorg-core_2%3a1.15.0-1ubuntu6_amd64.deb
Is the version of xserver-xorg-core tested against the last 1.14
version I have back to back with same mesa and kernel versions.
Framerates in both Critter and Scorched3d were cut roughly in half,
0ad is CPU bound and mimimally affected. I don't have any other GPU
intensive games nor the bandwidth to download them so cannot benchmark
them.
CPUs tested have been AMD FX-8120 and Phenom II x4
GPU's have been Radeon HD6750 and HD5770
proprietary drivers have NOT been tested
Here are the configuration files used with the AMD based desktops:
I use this xorg,conf file:
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "AccelerationScheme" "none"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
EndSection
Section "Device"
Identifier "Device0"
Driver "radeon"
Option "SwapbuffersWait" "off" #not the default
Option "ColorTiling" "on"
Option "ColorTiling2d" "on" #not the default
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1920x1080"
EndSubSection
EndSection
And this ~/.drirc:
<driconf>
<device screen="0" driver="dri2">
<application name="Default">
<option name="fthrottle_mode" value="2" />
<option name="pp_celshade" value="0" />
<option name="pp_jimenezmlaa" value="3" />
<option name="pp_jimenezmlaa_color" value="0" />
<option name="vblank_mode" value="0" />
<option name="pp_nored" value="0" />
<option name="pp_nogreen" value="0" />
<option name="allow_large_textures" value="1" />
<option name="pp_noblue" value="0" />
</application>
<application name="cinnamon" executable="cinnamon">
<option name="vblank_mode" value="1" />
<application name="mplayer" executable="mplayer">
<option name="vblank_mode" value="1" />
<application name="gnome-mplayer" executable="gnome-mplayer">
<option name="vblank_mode" value="1" />
<application name="mpv" executable="mpv">
<option name="vblank_mode" value="1" />
<application name="totem" executable="totem">
<option name="vblank_mode" value="1" />
<application name="criticalmass" executable="critter">
<option name="vblank_mode" value="0" />
</application>
<application name="glxgears" executable="glxgears">
<option name="vblank_mode" value="0" />
</application>
<application name="scorched3d" executable="scorched3d">
<option name="vblank_mode" value="0" />
</application>
</device>
<device screen="0" driver="r600">
<application name="Default">
<option name="fthrottle_mode" value="2" />
<option name="pp_celshade" value="0" />
<option name="pp_jimenezmlaa" value="0" />
<option name="pp_jimenezmlaa_color" value="0" />
<option name="vblank_mode" value="1" />
<option name="force_glsl_extensions_warn" value="false" />
<option name="pp_nored" value="0" />
<option name="pp_nogreen" value="0" />
<option name="allow_large_textures" value="1" />
<option name="pp_noblue" value="0" />
</application>
</device>
</driconf>
And this ~/.profile is used to enable hyper-Z and ensure the sb backend is
used in Mesa:
export R600_DEBUG=sb
export R600_HYPERZ=1
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