1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
Performance Tips
================
Intel GPUs
----------
#. Keep the system updated with the latest kernel and Mesa versions.
#. Ensure SoC firmware is up-to-date. These firmware updates currently
require installing the Windows graphics driver; firmware updates
via `fwupd` are in progress.
#. Use Wayland where possible, as it supports additional modifiers for
better performance.
#. For MTL and newer integrated GPUs, disable VT-d if virtualization is
not needed.
#. For discrete GPUs:
#. Enable `ReBAR`_
#. For workloads that keep the GPU busy (e.g. 3D videogames),
minimize idle power consumption by enabling `ASPM`_ powersave mode.
#. For "bursty", latency-sensitive workloads (e.g. AI inference),
enable ASPM performance mode.
#. Enable the 'performance' `cpufreq`_ governor.
.. _ReBAR: https://www.intel.com/content/www/us/en/support/articles/000090831/graphics.html
.. _ASPM: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/power_management_guide/aspm
.. _cpufreq: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/performance_tuning_guide/s-cpu-cpufreq
Software rendering
------------------
#. Turn off smooth shading when you don't need it (glShadeModel)
#. Turn off depth buffering when you don't need it.
#. Turn off dithering when not needed.
#. Use double buffering as it's often faster than single buffering
#. Compile in the X Shared Memory extension option if it's supported on
your system by adding -DSHM to CFLAGS and -lXext to XLIBS for your
system in the Make-config file.
#. Recompile Mesa with more optimization if possible.
#. Try to maximize the amount of drawing done between glBegin/glEnd
pairs.
#. Use the MESA_BACK_BUFFER variable to find best performance in double
buffered mode. (X users only)
#. Optimized polygon rasterizers are employed when: rendering into back
buffer which is an XImage RGB mode, not grayscale, not monochrome
depth buffering is GL_LESS, or disabled flat or smooth shading
dithered or non-dithered no other rasterization operations enabled
(blending, stencil, etc)
#. Optimized line drawing is employed when: rendering into back buffer
which is an XImage RGB mode, not grayscale, not monochrome depth
buffering is GL_LESS or disabled flat shading dithered or
non-dithered no other rasterization operations enabled (blending,
stencil, etc)
#. Textured polygons are fastest when: using a 3-component (RGB), 2-D
texture minification and magnification filters are GL_NEAREST texture
coordinate wrap modes for S and T are GL_REPEAT GL_DECAL environment
mode glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST ) depth
buffering is GL_LESS or disabled
#. Lighting is fastest when: Two-sided lighting is disabled
GL_LIGHT_MODEL_LOCAL_VIEWER is false GL_COLOR_MATERIAL is disabled No
spot lights are used (all GL_SPOT_CUTOFFs are 180.0) No local lights
are used (all position W's are 0.0) All material and light
coefficients are >= zero
#. XFree86 users: if you want to use 24-bit color try starting your X
server in 32-bit per pixel mode for better performance. That is,
start your X server with startx -- -bpp 32 instead of startx -- -bpp
24
#. Try disabling dithering with the MESA_NO_DITHER environment variable.
If this environment variable is defined Mesa will disable dithering
and the command glEnable(GL_DITHER) will be ignored.
|
