LLVMpipe rocks :)

**cb88** · 09-24-2010, 05:07 PM

meh... the cpu is probably alot more bandwith limited than the cpu anyway so that contributes to slowness as well.

**popper** · 12-20-2010, 12:31 PM

for no other reason than someone might find this info useful sometime and they referenced an unnamed phoronix thread
http://lists.freedesktop.org/archive...er/006428.html

>Álmos: BTW I found absolutely no docs about how to change the driver to softpipe from
> r300g. After hours of googling the only clue I found was
> 'LIBGL_ALWAYS_SOFTWARE=1' in a comment on a phoronix forum.

Marek Olšák: Create an empty directory, add a swrast_dri.so symlink there that points to
swrastg_dri.so or whatever driver you need. Set LIBGL_DRIVERS_PATH for it to
contain the path to that directory. Every 3D application will then look for
$LIBGL_DRIVERS_PATH/r300_dri.so, which wouldn't be there. Then it will look for
$LIBGL_DRIVERS_PATH/swrast_dri.so and load it.

To get r300g:
LIBGL_DRIVERS_PATH=/home/..../mesa/lib/gallium glxinfo

To get r300c:
LIBGL_DRIVERS_PATH=/home/..../mesa/lib glxinfo

To get swrast:
ln -s /home/..../mesa/lib/swrast_dri.so /some-path/swrast_dri.so
LIBGL_DRIVERS_PATH=/some-path glxinfo

To get llvmpipe (assumming you build with --enable-gallium-llvm):
ln -s /home/..../mesa/lib/gallium/swrastg_dri.so /some-path/swrast_dri.so
LIBGL_DRIVERS_PATH=/some-path glxinfo

To get softpipe (assumming you build with --enable-gallium-llvm):
ln -s /home/..../mesa/lib/gallium/swrastg_dri.so /some-path/swrast_dri.so
LIBGL_DRIVERS_PATH=/some-path GALLIUM_DRIVER=softpipe glxinfo

Or you may use LIBGL_ALWAYS_SOFTWARE, but I don't use that.

**runeks** · 01-03-2011, 05:17 PM

Originally Posted by darkbasic

This is openarena@640x480 with lowest settings on my shitty Intel gma45:

Code:

niko2@laptop ~ $ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 14.0 seconds 60.0 fps 6.0/16.7/57.0/3.0 ms

Obiouvsly it's capped at 60fps by vsync.

And this is with LLVMpipe on my *1.4Ghz* Core 2 duo ULV:

Code:

niko2@laptop ~ $ LIBGL_ALWAYS_SOFTWARE=1 openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 35.6 seconds 23.6 fps 22.0/42.3/794.0/15.0 ms

Not bad for an 1.4GHz cpu

That's odd. I get 5.5 fps running lowest settings on my Core 2 Quad 2.83 GHz:

Code:

rune@runescomp:~$ LIBGL_ALWAYS_SOFTWARE=1 openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 152.8 seconds 5.5 fps 88.0/181.9/465.0/44.5 ms

How can that be? I'm using the xorg-edgers PPA, by the way, with code from 20101221 git:

**kbios** · 01-06-2011, 11:49 AM

Originally Posted by runeks

That's odd. I get 5.5 fps running lowest settings on my Core 2 Quad 2.83 GHz:

Code:

rune@runescomp:~$ LIBGL_ALWAYS_SOFTWARE=1 openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 152.8 seconds 5.5 fps 88.0/181.9/465.0/44.5 ms

How can that be? I'm using the xorg-edgers PPA, by the way, with code from 20101221 git:

Last time I checked (December) xorg-edgers had only the software rasterizer (despite saying otherwise) which would produce results similar to yours. Could you check it with glxinfo?

**runeks** · 01-06-2011, 12:04 PM

^
Yep, you are right:

Code:

rune@runescomp:~$ LIBGL_ALWAYS_SOFTWARE=1 glxinfo | grep OpenGL
OpenGL vendor string: Mesa Project
OpenGL renderer string: Software Rasterizer
OpenGL version string: 2.1 Mesa 7.10-devel
OpenGL shading language version string: 1.20
OpenGL extensions:

Is it because I should be using the Gallium driver? Do they have the LLVM-pipe driver as the default for software rasterization?

I was actually going to try that, but I don't know where xorg-edgers have put the Gallium drivers now... They're not in /usr/lib/dri/gallium/ like they used to be. And libgl1-mesa-dri-experimental only contains the following:

Code:

rune@runescomp:~$ dpkg -L libgl1-mesa-dri-experimental
/.
/usr
/usr/lib
/usr/lib/dri
/usr/lib/dri/nouveau_dri.so
/usr/share
/usr/share/doc
/usr/share/doc/libgl1-mesa-dri-experimental
/usr/share/doc/libgl1-mesa-dri-experimental/changelog.gz
/usr/share/doc/libgl1-mesa-dri-experimental/changelog.Debian.gz
/usr/share/doc/libgl1-mesa-dri-experimental/copyright

**kbios** · 01-07-2011, 12:54 PM

Originally Posted by runeks

^
Yep, you are right:

Code:

rune@runescomp:~$ LIBGL_ALWAYS_SOFTWARE=1 glxinfo | grep OpenGL
OpenGL vendor string: Mesa Project
OpenGL renderer string: Software Rasterizer
OpenGL version string: 2.1 Mesa 7.10-devel
OpenGL shading language version string: 1.20
OpenGL extensions:

Is it because I should be using the Gallium driver? Do they have the LLVM-pipe driver as the default for software rasterization?

I was actually going to try that, but I don't know where xorg-edgers have put the Gallium drivers now... They're not in /usr/lib/dri/gallium/ like they used to be. And libgl1-mesa-dri-experimental only contains the following:

Code:

rune@runescomp:~$ dpkg -L libgl1-mesa-dri-experimental
/.
/usr
/usr/lib
/usr/lib/dri
/usr/lib/dri/nouveau_dri.so
/usr/share
/usr/share/doc
/usr/share/doc/libgl1-mesa-dri-experimental
/usr/share/doc/libgl1-mesa-dri-experimental/changelog.gz
/usr/share/doc/libgl1-mesa-dri-experimental/changelog.Debian.gz
/usr/share/doc/libgl1-mesa-dri-experimental/copyright

llvmpipe is part of gallium so you definitely need it. Last time I checked, however, llvmpipe was simply not built in xorg-edgers, so you will probably need to build it from source (not that hard, though).

**agd5f** · 01-14-2011, 12:11 AM

LIBGL_ALWAYS_SOFTWARE=1 uses swrast by default not llvmpipe. As was noted previously, see this link to force which 3D driver is used:
http://lists.freedesktop.org/archive...er/006428.html

**runeks** · 01-24-2011, 02:10 AM

Thanks for the input all. You're right, xorg-edgers don't package llvmpipe, so I had to build it myself. I finally got around to doing that:

Runs at a respectable ~30 fps:

Code:

rune@runescomp:~/Programming/mesa$ glxinfo | grep OpenGL
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe
OpenGL version string: 2.1 Mesa 7.11-devel
OpenGL shading language version string: 1.20
OpenGL extensions:
rune@runescomp:~/Programming/mesa$ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 30.5 seconds 27.6 fps 15.0/36.3/1021.0/16.0 ms

That's barely slower than my HD 3870! (at ~36 fps)

Code:

rune@runescomp:~/Programming/mesa$ glxinfo | grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV670
OpenGL version string: 1.4 (2.1 Mesa 7.11-devel)
OpenGL extensions:
rune@runescomp:~/Programming/mesa$ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 36.2 seconds 23.2 fps 2.0/43.1/109.0/19.6 ms

But I guess it's the low resolution right? 640x480 seems to create a bottleneck somewhere in the system. Still though... 36 fps isn't much on a GPU.

Here's 1600x1200 for a comparison:

Code:

rune@runescomp:~/Programming/mesa$ glxinfo | grep Gallium
OpenGL renderer string: Gallium 0.4 on llvmpipe
rune@runescomp:~/Programming/mesa$ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 76.1 seconds 11.0 fps 53.0/90.6/787.0/22.6 ms

Still, 11 fps at 1600x1200 isn't bad for software!

Code:

rune@runescomp:~/Programming/mesa$ glxinfo | grep Gallium
OpenGL renderer string: Gallium 0.4 on AMD RV670
rune@runescomp:~/Programming/mesa$ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 43.2 seconds 19.5 fps 3.0/51.4/113.0/21.1 ms

It's better, but only less that twice as fast. LLVMpipe does quite a job! (or maybe the RV670 gallium driver just sucks)

Hmm, by closer look I notice the r600g driver only supports OpenGL 1.4, could that be the problem? Falling back to software to reach version 2.1, or whatever is required by OpenArena?

**runeks** · 02-12-2011, 11:47 PM

I must have messed something up, probably setting LD_LIBRARY_PATH to something invalid. I'm getting proper framerates on r600g now.

At 640x480, a whopping 58 fps from llvmpipe vs. 72 fps for r600g:

Code:

rune@runescomp:~/Programming/mesa$ LD_LIBRARY_PATH=/home/rune/Programming/mesa/lib LIBGL_DRIVERS_PATH=/home/rune/Programming/mesa/lib/gallium/ glxinfo | grep OpenGL
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe
OpenGL version string: 2.1 Mesa 7.11-devel
OpenGL shading language version string: 1.20
OpenGL extensions:
rune@runescomp:~/Programming/mesa$ LD_LIBRARY_PATH=/home/rune/Programming/mesa/lib LIBGL_DRIVERS_PATH=/home/rune/Programming/mesa/lib/gallium/ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 14.5 seconds 57.8 fps 7.0/17.3/355.0/10.2 ms
rune@runescomp:~/Programming/mesa$ glxinfo | grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV670
OpenGL version string: 2.1 Mesa 7.11-devel
OpenGL shading language version string: 1.20
OpenGL extensions:
rune@runescomp:~/Programming/mesa$ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 11.6 seconds 72.3 fps 4.0/13.8/50.0/2.6 ms

At 1600x1200, llvmpipe is up to 20 fps now and r600g is at 77 fps:

Code:

rune@runescomp:~/Programming/mesa$ LD_LIBRARY_PATH=/home/rune/Programming/mesa/lib LIBGL_DRIVERS_PATH=/home/rune/Programming/mesa/lib/gallium/ glxinfo | grep OpenGL
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe
OpenGL version string: 2.1 Mesa 7.11-devel
OpenGL shading language version string: 1.20
OpenGL extensions:
rune@runescomp:~/Programming/mesa$ LD_LIBRARY_PATH=/home/rune/Programming/mesa/lib LIBGL_DRIVERS_PATH=/home/rune/Programming/mesa/lib/gallium/ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 41.5 seconds 20.2 fps 31.0/49.4/519.0/14.0 ms
rune@runescomp:~/Programming/mesa$ glxinfo | grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV670
OpenGL version string: 2.1 Mesa 7.11-devel
OpenGL shading language version string: 1.20
OpenGL extensions:
rune@runescomp:~/Programming/mesa$ openarena +exec anholt 2>&1 | egrep -e '[0-9]+ frames'
840 frames 11.0 seconds 76.7 fps 2.0/13.0/51.0/5.0 ms

I'm still impressed by llvm(pipe). r600g frame rate seems to be limited to vsync though, and vblank_mode=0 doesn't seem to help.

**Pontostroy** · 02-13-2011, 10:44 AM

Originally Posted by runeks

I'm still impressed by llvm(pipe). r600g frame rate seems to be limited to vsync though, and vblank_mode=0 doesn't seem to help.

May be Option "SwapbuffersWait" "off" in xorg.conf?

Code:

vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
ATTENTION: default value of option vblank_mode overridden by environment.
4469 frames in 5.0 seconds = 893.767 FPS

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