Hello guys I’ve been researching ways to improve gaming performance on linux as usual, and have been learning about cpu flags that represent extensions for the cpu that are supported by linux.
To see these you use …
cat /proc/cpuinfo
and examine the flags section.
I learned though, reading the kernel documentation, that the flags in cpuinfo actually do not represent the full feature set of our cpu’s but flags recognized and possibly supported by the linux kernel!
https://docs.kernel.org/arch/x86/cpuinfo.html
So, if users want to know if a feature is available on a given system, they try to find the flag in /proc/cpuinfo. If a given flag is present, it means that
the kernel knows about the feature enough to have an X86_FEATURE bit the kernel supports it and is currently making it available either to userspace or some other part of the kernel if the flag represents a hardware feature the hardware supports it.The absence of a flag in /proc/cpuinfo by itself means almost nothing to an end user.
On the one hand, a feature like “vaes” might be fully available to user applications on a kernel that has not defined X86_FEATURE_VAES and thus there is no “vaes” in /proc/cpuinfo.
On the other hand, a new kernel running on non-VAES hardware would also have no “vaes” in /proc/cpuinfo. There’s no way for an application or user to tell the difference.
The end result is that the flags field in /proc/cpuinfo is marginally useful for kernel debugging, but not really for anything else. Applications should instead use things like the glibc facilities for querying CPU support. Users should rely on tools like tools/arch/x86/kcpuid and cpuid(1).
! I couldn’t believe my eyes when I read this. Without actually finding the specific section on cpu flags in the kernel documentation I had no way of knowing what these flags really meant.
So now I’ve started learning about the features of my CPU using cpuid instead, and I’ve also started attempting to the use the manufacturer of my cpu’s website to discover technical, and useful information, but intel is sort of obscure about these issues…
With the kernel, I can plainly go straight to the section of documentation explaining in detail every single aspect of it’s operations, which then I can immediately leverage. Other provider’s are not so nice…
Some of these features are barriers to performance, and thanks to the kernel, can be turned off right at it’s command line like this:
clearcpuid=mpx,ibrs,ibpb,smx,stibp,vme
My question to you guys is…
Does anyone know how to learn about specific features within NVIDIA’s linux driver relative to it’s hardware, that can be leveraged similarly? I.E. Turned on and off to improve performance.
I understand this is possible, and for me, I try to use every single possible program, and interface, almost every day, to turn off as many “features” as possible to improve performance of gaming in linux. It’s a constant daily battle, discoverying “features” that are bottlenecks to improved performance.
Looking at nvidia-settings there are maybe 20 or less settings total the user can use to improve their systems performance. Lowering color depth for example, is purportedly supposed to help in rendering games at higher frame rates, although in practice this is not plainly evident. The real catalyst for improved performance is turning off features that tax our hardware, and it’s capabilities.
In competitive gaming it’s essential to understand every single component that adds up to produce the environment we intend to interact with, the game world, and the potential performance we can use to our advantage.
One of the most important examples is the difference between using directx9/10/11 on a single game, which translates to enormous performance benefits, across all aspects of performance for the end user. Some games allow the user to use a lower “feature set” such as directx10 instead of 11 or a reduced feature set for directx11, and this translates to huge performance gains, that actually make modern games enjoyable…
Looking at nvidia-settings “graphics information” we can see lots of different software extensions…
GLX_ARB_get_proc_address
GLX_ARB_multisample
GLX_EXT_visual_infoGL_AMD_multi_draw_indirect
GL_AMD_seamless_cubemap_per_texture
GL_AMD_vertex_shader_viewport_index
GL_AMD_vertex_shader_layer
GL_ARB_arrays_of_arrays
GL_ARB_base_instance
GL_ARB_bindless_texture
GL_ARB_blend_func_extended
GL_ARB_buffer_storage
GL_ARB_clear_buffer_object
GL_ARB_clear_texture
GL_ARB_clip_control
GL_ARB_color_buffer_float
GL_ARB_compatibility
GL_ARB_compressed_texture_pixel_storage
GL_ARB_conservative_depth
GL_ARB_compute_shader
GL_ARB_compute_variable_group_size
GL_ARB_conditional_render_inverted
GL_ARB_copy_buffer
GL_ARB_copy_image
GL_ARB_cull_distance
GL_ARB_debug_output
GL_ARB_depth_buffer_float
GL_ARB_depth_clamp
GL_ARB_depth_texture
GL_ARB_derivative_control
GL_ARB_direct_state_access
GL_ARB_draw_buffers
GL_ARB_draw_buffers_blend
GL_ARB_draw_indirect
GL_ARB_draw_elements_base_vertex
GL_ARB_draw_instanced
GL_ARB_enhanced_layouts
GL_ARB_ES2_compatibility
GL_ARB_ES3_compatibility
GL_ARB_ES3_1_compatibility
GL_ARB_ES3_2_compatibility
GL_ARB_explicit_attrib_location
GL_ARB_explicit_uniform_location
GL_ARB_fragment_coord_conventions
GL_ARB_fragment_layer_viewport
GL_ARB_fragment_program
GL_ARB_fragment_program_shadow
GL_ARB_fragment_shader
GL_ARB_fragment_shader_interlock
GL_ARB_framebuffer_no_attachments
GL_ARB_framebuffer_object
GL_ARB_framebuffer_sRGB
GL_ARB_geometry_shader4
GL_ARB_get_program_binary
GL_ARB_get_texture_sub_image
GL_ARB_gl_spirv
GL_ARB_gpu_shader5
GL_ARB_gpu_shader_fp64
GL_ARB_gpu_shader_int64
GL_ARB_half_float_pixel
GL_ARB_half_float_vertex
GL_ARB_imaging
GL_ARB_indirect_parameters
GL_ARB_instanced_arrays
GL_ARB_internalformat_query
GL_ARB_internalformat_query2
GL_ARB_invalidate_subdata
GL_ARB_map_buffer_alignment
GL_ARB_map_buffer_range
GL_ARB_multi_bind
GL_ARB_multi_draw_indirect
GL_ARB_multisample
GL_ARB_multitexture
GL_ARB_occlusion_query
GL_ARB_occlusion_query2
GL_ARB_parallel_shader_compile
GL_ARB_pipeline_statistics_query
GL_ARB_pixel_buffer_object
GL_ARB_point_parameters
GL_ARB_point_sprite
GL_ARB_polygon_offset_clamp
GL_ARB_post_depth_coverage
GL_ARB_program_interface_query
GL_ARB_provoking_vertex
GL_ARB_query_buffer_object
GL_ARB_robust_buffer_access_behavior
GL_ARB_robustness
GL_ARB_sample_locations
GL_ARB_sample_shading
GL_ARB_sampler_objects
GL_ARB_seamless_cube_map
GL_ARB_seamless_cubemap_per_texture
GL_ARB_separate_shader_objects
GL_ARB_shader_atomic_counter_ops
GL_ARB_shader_atomic_counters
GL_ARB_shader_ballot
GL_ARB_shader_bit_encoding
GL_ARB_shader_clock
GL_ARB_shader_draw_parameters
GL_ARB_shader_group_vote
GL_ARB_shader_image_load_store
GL_ARB_shader_image_size
GL_ARB_shader_objects
GL_ARB_shader_precision
GL_ARB_shader_storage_buffer_object
GL_ARB_shader_subroutine
GL_ARB_shader_texture_image_samples
GL_ARB_shader_texture_lod
GL_ARB_shading_language_100
GL_ARB_shader_viewport_layer_array
GL_ARB_shading_language_420pack
GL_ARB_shading_language_include
GL_ARB_shading_language_packing
GL_ARB_shadow
GL_ARB_sparse_buffer
GL_ARB_sparse_texture
GL_ARB_sparse_texture2
GL_ARB_sparse_texture_clamp
GL_ARB_spirv_extensions
GL_ARB_stencil_texturing
GL_ARB_sync
GL_ARB_tessellation_shader
GL_ARB_texture_barrier
GL_ARB_texture_border_clamp
GL_ARB_texture_buffer_object
GL_ARB_texture_buffer_object_rgb32
GL_ARB_texture_buffer_range
GL_ARB_texture_compression
GL_ARB_texture_compression_bptc
GL_ARB_texture_compression_rgtc
GL_ARB_texture_cube_map
GL_ARB_texture_cube_map_array
GL_ARB_texture_env_add
GL_ARB_texture_env_combine
GL_ARB_texture_env_crossbar
GL_ARB_texture_env_dot3
GL_ARB_texture_filter_anisotropic
GL_ARB_texture_filter_minmax
GL_ARB_texture_float
GL_ARB_texture_gather
GL_ARB_texture_mirror_clamp_to_edge
GL_ARB_texture_mirrored_repeat
GL_ARB_texture_multisample
GL_ARB_texture_non_power_of_two
GL_ARB_texture_query_levels
GL_ARB_texture_query_lod
GL_ARB_texture_rectangle
GL_ARB_texture_rg
GL_ARB_texture_rgb10_a2ui
GL_ARB_texture_stencil8
GL_ARB_texture_storage
GL_ARB_texture_storage_multisample
GL_ARB_texture_swizzle
GL_ARB_texture_view
GL_ARB_timer_query
GL_ARB_transform_feedback2
GL_ARB_transform_feedback3
GL_ARB_transform_feedback_instanced
GL_ARB_transform_feedback_overflow_query
GL_ARB_transpose_matrix
GL_ARB_uniform_buffer_object
GL_ARB_vertex_array_bgra
GL_ARB_vertex_array_object
GL_ARB_vertex_attrib_64bit
GL_ARB_vertex_attrib_binding
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_vertex_shader
GL_ARB_vertex_type_10f_11f_11f_rev
GL_ARB_vertex_type_2_10_10_10_rev
GL_ARB_viewport_array
GL_ARB_window_pos
GL_ATI_draw_buffers
GL_ATI_texture_float
GL_ATI_texture_mirror_once
GL_S3_s3tc
GL_EXT_texture_env_add
GL_EXT_abgr
GL_EXT_bgra
GL_EXT_bindable_uniform
GL_EXT_blend_color
GL_EXT_blend_equation_separate
GL_EXT_blend_func_separate
GL_EXT_blend_minmax
GL_EXT_blend_subtract
GL_EXT_compiled_vertex_array
GL_EXT_Cg_shader
GL_EXT_depth_bounds_test
GL_EXT_direct_state_access
GL_EXT_draw_buffers2
GL_EXT_draw_instanced
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_framebuffer_blit
GL_EXT_framebuffer_multisample
GL_EXTX_framebuffer_mixed_formats
GL_EXT_framebuffer_multisample_blit_scaled
GL_EXT_framebuffer_object
GL_EXT_framebuffer_sRGB
GL_EXT_geometry_shader4
GL_EXT_gpu_program_parameters
GL_EXT_gpu_shader4
GL_EXT_multi_draw_arrays
GL_EXT_multiview_texture_multisample
GL_EXT_multiview_timer_query
GL_EXT_packed_depth_stencil
GL_EXT_packed_float
GL_EXT_packed_pixels
GL_EXT_pixel_buffer_object
GL_EXT_point_parameters
GL_EXT_polygon_offset_clamp
GL_EXT_post_depth_coverage
GL_EXT_provoking_vertex
GL_EXT_raster_multisample
GL_EXT_rescale_normal
GL_EXT_secondary_color
GL_EXT_separate_shader_objects
GL_EXT_separate_specular_color
GL_EXT_shader_image_load_formatted
GL_EXT_shader_image_load_store
GL_EXT_shader_integer_mix
GL_EXT_shadow_funcs
GL_EXT_sparse_texture2
GL_EXT_stencil_two_side
GL_EXT_stencil_wrap
GL_EXT_texture3D
GL_EXT_texture_array
GL_EXT_texture_buffer_object
GL_EXT_texture_compression_dxt1
GL_EXT_texture_compression_latc
GL_EXT_texture_compression_rgtc
GL_EXT_texture_compression_s3tc
GL_EXT_texture_cube_map
GL_EXT_texture_edge_clamp
GL_EXT_texture_env_combine
GL_EXT_texture_env_dot3
GL_EXT_texture_filter_anisotropic
GL_EXT_texture_filter_minmax
GL_EXT_texture_integer
GL_EXT_texture_lod
GL_EXT_texture_lod_bias
GL_EXT_texture_mirror_clamp
GL_EXT_texture_object
GL_EXT_texture_shadow_lod
GL_EXT_texture_shared_exponent
GL_EXT_texture_sRGB
GL_EXT_texture_sRGB_R8
GL_EXT_texture_sRGB_decode
GL_EXT_texture_storage
GL_EXT_texture_swizzle
GL_EXT_timer_query
GL_EXT_transform_feedback2
GL_EXT_vertex_array
GL_EXT_vertex_array_bgra
GL_EXT_vertex_attrib_64bit
GL_EXT_window_rectangles
GL_EXT_x11_sync_object
GL_EXT_import_sync_object
GL_NV_robustness_video_memory_purge
GL_IBM_rasterpos_clip
GL_IBM_texture_mirrored_repeat
GL_KHR_context_flush_control
GL_KHR_debug
GL_EXT_memory_object
GL_EXT_memory_object_fd
GL_NV_memory_object_sparse
GL_KHR_parallel_shader_compile
GL_KHR_no_error
GL_KHR_robust_buffer_access_behavior
GL_KHR_robustness
GL_EXT_semaphore
GL_EXT_semaphore_fd
GL_NV_timeline_semaphore
GL_KHR_shader_subgroup
GL_KTX_buffer_region
GL_NV_alpha_to_coverage_dither_control
GL_NV_bindless_multi_draw_indirect
GL_NV_bindless_multi_draw_indirect_count
GL_NV_bindless_texture
GL_NV_blend_equation_advanced
GL_NV_blend_equation_advanced_coherent
GL_NVX_blend_equation_advanced_multi_draw_buffers
GL_NV_blend_minmax_factor
GL_NV_blend_square
GL_NV_clip_space_w_scaling
GL_NV_command_list
GL_NV_compute_program5
GL_NV_compute_shader_derivatives
GL_NV_conditional_render
GL_NV_conservative_raster
GL_NV_conservative_raster_dilate
GL_NV_conservative_raster_pre_snap
GL_NV_conservative_raster_pre_snap_triangles
GL_NV_conservative_raster_underestimation
GL_NV_copy_depth_to_color
GL_NV_copy_image
GL_NV_depth_buffer_float
GL_NV_depth_clamp
GL_NV_draw_texture
GL_NV_draw_vulkan_image
GL_NV_ES1_1_compatibility
GL_NV_ES3_1_compatibility
GL_NV_explicit_multisample
GL_NV_feature_query
GL_NV_fence
GL_NV_fill_rectangle
GL_NV_float_buffer
GL_NV_fog_distance
GL_NV_fragment_coverage_to_color
GL_NV_fragment_program
GL_NV_fragment_program_option
GL_NV_fragment_program2
GL_NV_fragment_shader_barycentric
GL_NV_fragment_shader_interlock
GL_NV_framebuffer_mixed_samples
GL_NV_framebuffer_multisample_coverage
GL_NV_geometry_shader4
GL_NV_geometry_shader_passthrough
GL_NV_gpu_program4
GL_NV_internalformat_sample_query
GL_NV_gpu_program4_1
GL_NV_gpu_program5
GL_NV_gpu_program5_mem_extended
GL_NV_gpu_program_fp64
GL_NV_gpu_shader5
GL_NV_half_float
GL_NV_light_max_exponent
GL_NV_memory_attachment
GL_NV_mesh_shader
GL_NV_multisample_coverage
GL_NV_multisample_filter_hint
GL_NV_occlusion_query
GL_NV_packed_depth_stencil
GL_NV_parameter_buffer_object
GL_NV_parameter_buffer_object2
GL_NV_path_rendering
GL_NV_path_rendering_shared_edge
GL_NV_pixel_data_range
GL_NV_point_sprite
GL_NV_primitive_restart
GL_NV_primitive_shading_rate
GL_NV_query_resource
GL_NV_query_resource_tag
GL_NV_register_combiners
GL_NV_register_combiners2
GL_NV_representative_fragment_test
GL_NV_sample_locations
GL_NV_sample_mask_override_coverage
GL_NV_scissor_exclusive
GL_NV_shader_atomic_counters
GL_NV_shader_atomic_float
GL_NV_shader_atomic_float64
GL_NV_shader_atomic_fp16_vector
GL_NV_shader_atomic_int64
GL_NV_shader_buffer_load
GL_NV_shader_storage_buffer_object
GL_NV_shader_subgroup_partitioned
GL_NV_shader_texture_footprint
GL_NV_shading_rate_image
GL_NV_stereo_view_rendering
GL_NV_texgen_reflection
GL_NV_texture_barrier
GL_NV_texture_compression_vtc
GL_NV_texture_dirty_tile_map
GL_NV_texture_env_combine4
GL_NV_texture_multisample
GL_NV_texture_rectangle
GL_NV_texture_rectangle_compressed
GL_NV_texture_shader
GL_NV_texture_shader2
GL_NV_texture_shader3
GL_NV_transform_feedback
GL_NV_transform_feedback2
GL_NV_uniform_buffer_unified_memory
GL_NV_uniform_buffer_std430_layout
GL_NV_vdpau_interop
GL_NV_vdpau_interop2
GL_NV_vertex_array_range
GL_NV_vertex_array_range2
GL_NV_vertex_attrib_integer_64bit
GL_NV_vertex_buffer_unified_memory
GL_NV_vertex_program
GL_NV_vertex_program1_1
GL_NV_vertex_program2
GL_NV_vertex_program2_option
GL_NV_vertex_program3
GL_NV_viewport_array2
GL_NV_viewport_swizzle
GL_NVX_conditional_render
GL_NV_gpu_multicast
GL_NVX_progress_fence
GL_NVX_gpu_memory_info
GL_NVX_nvenc_interGL_AMD_multi_draw_indirect
GL_AMD_seamless_cubemap_per_texture
GL_AMD_vertex_shader_viewport_index
GL_AMD_vertex_shader_layer
GL_ARB_arrays_of_arrays
GL_ARB_base_instance
GL_ARB_bindless_texture
GL_ARB_blend_func_extended
GL_ARB_buffer_storage
GL_ARB_clear_buffer_object
GL_ARB_clear_texture
GL_ARB_clip_control
GL_ARB_color_buffer_float
GL_ARB_compatibility
GL_ARB_compressed_texture_pixel_storage
GL_ARB_conservative_depth
GL_ARB_compute_shader
GL_ARB_compute_variable_group_size
GL_ARB_conditional_render_inverted
GL_ARB_copy_buffer
GL_ARB_copy_image
GL_ARB_cull_distance
GL_ARB_debug_output
GL_ARB_depth_buffer_float
GL_ARB_depth_clamp
GL_ARB_depth_texture
GL_ARB_derivative_control
GL_ARB_direct_state_access
GL_ARB_draw_buffers
GL_ARB_draw_buffers_blend
GL_ARB_draw_indirect
GL_ARB_draw_elements_base_vertex
GL_ARB_draw_instanced
GL_ARB_enhanced_layouts
GL_ARB_ES2_compatibility
GL_ARB_ES3_compatibility
GL_ARB_ES3_1_compatibility
GL_ARB_ES3_2_compatibility
GL_ARB_explicit_attrib_location
GL_ARB_explicit_uniform_location
GL_ARB_fragment_coord_conventions
GL_ARB_fragment_layer_viewport
GL_ARB_fragment_program
GL_ARB_fragment_program_shadow
GL_ARB_fragment_shader
GL_ARB_fragment_shader_interlock
GL_ARB_framebuffer_no_attachments
GL_ARB_framebuffer_object
GL_ARB_framebuffer_sRGB
GL_ARB_geometry_shader4
GL_ARB_get_program_binary
GL_ARB_get_texture_sub_image
GL_ARB_gl_spirv
GL_ARB_gpu_shader5
GL_ARB_gpu_shader_fp64
GL_ARB_gpu_shader_int64
GL_ARB_half_float_pixel
GL_ARB_half_float_vertex
GL_ARB_imaging
GL_ARB_indirect_parameters
GL_ARB_instanced_arrays
GL_ARB_internalformat_query
GL_ARB_internalformat_query2
GL_ARB_invalidate_subdata
GL_ARB_map_buffer_alignment
GL_ARB_map_buffer_range
GL_ARB_multi_bind
GL_ARB_multi_draw_indirect
GL_ARB_multisample
GL_ARB_multitexture
GL_ARB_occlusion_query
GL_ARB_occlusion_query2
GL_ARB_parallel_shader_compile
GL_ARB_pipeline_statistics_query
GL_ARB_pixel_buffer_object
GL_ARB_point_parameters
GL_ARB_point_sprite
GL_ARB_polygon_offset_clamp
GL_ARB_post_depth_coverage
GL_ARB_program_interface_query
GL_ARB_provoking_vertex
GL_ARB_query_buffer_object
GL_ARB_robust_buffer_access_behavior
GL_ARB_robustness
GL_ARB_sample_locations
GL_ARB_sample_shading
GL_ARB_sampler_objects
GL_ARB_seamless_cube_map
GL_ARB_seamless_cubemap_per_texture
GL_ARB_separate_shader_objects
GL_ARB_shader_atomic_counter_ops
GL_ARB_shader_atomic_counters
GL_ARB_shader_ballot
GL_ARB_shader_bit_encoding
GL_ARB_shader_clock
GL_ARB_shader_draw_parameters
GL_ARB_shader_group_vote
GL_ARB_shader_image_load_store
GL_ARB_shader_image_size
GL_ARB_shader_objects
GL_ARB_shader_precision
GL_ARB_shader_storage_buffer_object
GL_ARB_shader_subroutine
GL_ARB_shader_texture_image_samples
GL_ARB_shader_texture_lod
GL_ARB_shading_language_100
GL_ARB_shader_viewport_layer_array
GL_ARB_shading_language_420pack
GL_ARB_shading_language_include
GL_ARB_shading_language_packing
GL_ARB_shadow
GL_ARB_sparse_buffer
GL_ARB_sparse_texture
GL_ARB_sparse_texture2
GL_ARB_sparse_texture_clamp
GL_ARB_spirv_extensions
GL_ARB_stencil_texturing
GL_ARB_sync
GL_ARB_tessellation_shader
GL_ARB_texture_barrier
GL_ARB_texture_border_clamp
GL_ARB_texture_buffer_object
GL_ARB_texture_buffer_object_rgb32
GL_ARB_texture_buffer_range
GL_ARB_texture_compression
GL_ARB_texture_compression_bptc
GL_ARB_texture_compression_rgtc
GL_ARB_texture_cube_map
GL_ARB_texture_cube_map_array
GL_ARB_texture_env_add
GL_ARB_texture_env_combine
GL_ARB_texture_env_crossbar
GL_ARB_texture_env_dot3
GL_ARB_texture_filter_anisotropic
GL_ARB_texture_filter_minmax
GL_ARB_texture_float
GL_ARB_texture_gather
GL_ARB_texture_mirror_clamp_to_edge
GL_ARB_texture_mirrored_repeat
GL_ARB_texture_multisample
GL_ARB_texture_non_power_of_two
GL_ARB_texture_query_levels
GL_ARB_texture_query_lod
GL_ARB_texture_rectangle
GL_ARB_texture_rg
GL_ARB_texture_rgb10_a2ui
GL_ARB_texture_stencil8
GL_ARB_texture_storage
GL_ARB_texture_storage_multisample
GL_ARB_texture_swizzle
GL_ARB_texture_view
GL_ARB_timer_query
GL_ARB_transform_feedback2
GL_ARB_transform_feedback3
GL_ARB_transform_feedback_instanced
GL_ARB_transform_feedback_overflow_query
GL_ARB_transpose_matrix
GL_ARB_uniform_buffer_object
GL_ARB_vertex_array_bgra
GL_ARB_vertex_array_object
GL_ARB_vertex_attrib_64bit
GL_ARB_vertex_attrib_binding
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_vertex_shader
GL_ARB_vertex_type_10f_11f_11f_rev
GL_ARB_vertex_type_2_10_10_10_rev
GL_ARB_viewport_array
GL_ARB_window_pos
GL_ATI_draw_buffers
GL_ATI_texture_float
GL_ATI_texture_mirror_once
GL_S3_s3tc
GL_EXT_texture_env_add
GL_EXT_abgr
GL_EXT_bgra
GL_EXT_bindable_uniform
GL_EXT_blend_color
GL_EXT_blend_equation_separate
GL_EXT_blend_func_separate
GL_EXT_blend_minmax
GL_EXT_blend_subtract
GL_EXT_compiled_vertex_array
GL_EXT_Cg_shader
GL_EXT_depth_bounds_test
GL_EXT_direct_state_access
GL_EXT_draw_buffers2
GL_EXT_draw_instanced
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_framebuffer_blit
GL_EXT_framebuffer_multisample
GL_EXTX_framebuffer_mixed_formats
GL_EXT_framebuffer_multisample_blit_scaled
GL_EXT_framebuffer_object
GL_EXT_framebuffer_sRGB
GL_EXT_geometry_shader4
GL_EXT_gpu_program_parameters
GL_EXT_gpu_shader4
GL_EXT_multi_draw_arrays
GL_EXT_multiview_texture_multisample
GL_EXT_multiview_timer_query
GL_EXT_packed_depth_stencil
GL_EXT_packed_float
GL_EXT_packed_pixels
GL_EXT_pixel_buffer_object
GL_EXT_point_parameters
GL_EXT_polygon_offset_clamp
GL_EXT_post_depth_coverage
GL_EXT_provoking_vertex
GL_EXT_raster_multisample
GL_EXT_rescale_normal
GL_EXT_secondary_color
GL_EXT_separate_shader_objects
GL_EXT_separate_specular_color
GL_EXT_shader_image_load_formatted
GL_EXT_shader_image_load_store
GL_EXT_shader_integer_mix
GL_EXT_shadow_funcs
GL_EXT_sparse_texture2
GL_EXT_stencil_two_side
GL_EXT_stencil_wrap
GL_EXT_texture3D
GL_EXT_texture_array
GL_EXT_texture_buffer_object
GL_EXT_texture_compression_dxt1
GL_EXT_texture_compression_latc
GL_EXT_texture_compression_rgtc
GL_EXT_texture_compression_s3tc
GL_EXT_texture_cube_map
GL_EXT_texture_edge_clamp
GL_EXT_texture_env_combine
GL_EXT_texture_env_dot3
GL_EXT_texture_filter_anisotropic
GL_EXT_texture_filter_minmax
GL_EXT_texture_integer
GL_EXT_texture_lod
GL_EXT_texture_lod_bias
GL_EXT_texture_mirror_clamp
GL_EXT_texture_object
GL_EXT_texture_shadow_lod
GL_EXT_texture_shared_exponent
GL_EXT_texture_sRGB
GL_EXT_texture_sRGB_R8
GL_EXT_texture_sRGB_decode
GL_EXT_texture_storage
GL_EXT_texture_swizzle
GL_EXT_timer_query
GL_EXT_transform_feedback2
GL_EXT_vertex_array
GL_EXT_vertex_array_bgra
GL_EXT_vertex_attrib_64bit
GL_EXT_window_rectangles
GL_EXT_x11_sync_object
GL_EXT_import_sync_object
GL_NV_robustness_video_memory_purge
GL_IBM_rasterpos_clip
GL_IBM_texture_mirrored_repeat
GL_KHR_context_flush_control
GL_KHR_debug
GL_EXT_memory_object
GL_EXT_memory_object_fd
GL_NV_memory_object_sparse
GL_KHR_parallel_shader_compile
GL_KHR_no_error
GL_KHR_robust_buffer_access_behavior
GL_KHR_robustness
GL_EXT_semaphore
GL_EXT_semaphore_fd
GL_NV_timeline_semaphore
GL_KHR_shader_subgroup
GL_KTX_buffer_region
GL_NV_alpha_to_coverage_dither_control
GL_NV_bindless_multi_draw_indirect
GL_NV_bindless_multi_draw_indirect_count
GL_NV_bindless_texture
GL_NV_blend_equation_advanced
GL_NV_blend_equation_advanced_coherent
GL_NVX_blend_equation_advanced_multi_draw_buffers
GL_NV_blend_minmax_factor
GL_NV_blend_square
GL_NV_clip_space_w_scaling
GL_NV_command_list
GL_NV_compute_program5
GL_NV_compute_shader_derivatives
GL_NV_conditional_render
GL_NV_conservative_raster
GL_NV_conservative_raster_dilate
GL_NV_conservative_raster_pre_snap
GL_NV_conservative_raster_pre_snap_triangles
GL_NV_conservative_raster_underestimation
GL_NV_copy_depth_to_color
GL_NV_copy_image
GL_NV_depth_buffer_float
GL_NV_depth_clamp
GL_NV_draw_texture
GL_NV_draw_vulkan_image
GL_NV_ES1_1_compatibility
GL_NV_ES3_1_compatibility
GL_NV_explicit_multisample
GL_NV_feature_query
GL_NV_fence
GL_NV_fill_rectangle
GL_NV_float_buffer
GL_NV_fog_distance
GL_NV_fragment_coverage_to_color
GL_NV_fragment_program
GL_NV_fragment_program_option
GL_NV_fragment_program2
GL_NV_fragment_shader_barycentric
GL_NV_fragment_shader_interlock
GL_NV_framebuffer_mixed_samples
GL_NV_framebuffer_multisample_coverage
GL_NV_geometry_shader4
GL_NV_geometry_shader_passthrough
GL_NV_gpu_program4
GL_NV_internalformat_sample_query
GL_NV_gpu_program4_1
GL_NV_gpu_program5
GL_NV_gpu_program5_mem_extended
GL_NV_gpu_program_fp64
GL_NV_gpu_shader5
GL_NV_half_float
GL_NV_light_max_exponent
GL_NV_memory_attachment
GL_NV_mesh_shader
GL_NV_multisample_coverage
GL_NV_multisample_filter_hint
GL_NV_occlusion_query
GL_NV_packed_depth_stencil
GL_NV_parameter_buffer_object
GL_NV_parameter_buffer_object2
GL_NV_path_rendering
GL_NV_path_rendering_shared_edge
GL_NV_pixel_data_range
GL_NV_point_sprite
GL_NV_primitive_restart
GL_NV_primitive_shading_rate
GL_NV_query_resource
GL_NV_query_resource_tag
GL_NV_register_combiners
GL_NV_register_combiners2
GL_NV_representative_fragment_test
GL_NV_sample_locations
GL_NV_sample_mask_override_coverage
GL_NV_scissor_exclusive
GL_NV_shader_atomic_counters
GL_NV_shader_atomic_float
GL_NV_shader_atomic_float64
GL_NV_shader_atomic_fp16_vector
GL_NV_shader_atomic_int64
GL_NV_shader_buffer_load
GL_NV_shader_storage_buffer_object
GL_NV_shader_subgroup_partitioned
GL_NV_shader_texture_footprint
GL_NV_shading_rate_image
GL_NV_stereo_view_rendering
GL_NV_texgen_reflection
GL_NV_texture_barrier
GL_NV_texture_compression_vtc
GL_NV_texture_dirty_tile_map
GL_NV_texture_env_combine4
GL_NV_texture_multisample
GL_NV_texture_rectangle
GL_NV_texture_rectangle_compressed
GL_NV_texture_shader
GL_NV_texture_shader2
GL_NV_texture_shader3
GL_NV_transform_feedback
GL_NV_transform_feedback2
GL_NV_uniform_buffer_unified_memory
GL_NV_uniform_buffer_std430_layout
GL_NV_vdpau_interop
GL_NV_vdpau_interop2
GL_NV_vertex_array_range
GL_NV_vertex_array_range2
GL_NV_vertex_attrib_integer_64bit
GL_NV_vertex_buffer_unified_memory
GL_NV_vertex_program
GL_NV_vertex_program1_1
GL_NV_vertex_program2
GL_NV_vertex_program2_option
GL_NV_vertex_program3
GL_NV_viewport_array2
GL_NV_viewport_swizzle
GL_NVX_conditional_render
GL_NV_gpu_multicast
GL_NVX_progress_fence
GL_NVX_gpu_memory_info
GL_NVX_nvenc_interop
GL_NV_shader_thread_group
GL_NV_shader_thread_shuffle
GL_KHR_blend_equation_advanced
GL_KHR_blend_equation_advanced_coherent
GL_OVR_multiview
GL_OVR_multiview2
GL_SGIS_generate_mipmap
GL_SGIS_texture_lod
GL_SGIX_depth_texture
GL_SGIX_shadow
GL_SUN_slice_accum
re
GL_SGIX_shadow
GL_SUN_slice_accum
text_es2_profile
GLX_ARB_create_context_no_error
GLX_ARB_create_context_robustness
GLX_NV_delay_before_swap
GLX_EXT_stereo_tree
GLX_ARB_context_flush_control
GLX_NV_robustness_video_memory_purge
GLX_NV_multigpu_context
GLX_EXT_visual_info
GLX_EXT_visual_rating
GLX_EXT_import_context
GLX_SGIX_fbconfig
GLX_SGIX_pbuffer
GLX_SGI_video_sync
GLX_SGI_swap_control
GLX_EXT_swap_control
GLX_EXT_swap_control_tear
GLX_EXT_texture_from_pixmap
GLX_EXT_buffer_age
GLX_ARB_create_context
GLX_ARB_create_context_profile
GLX_EXT_create_context_es_profile
GLX_EXT_create_context_es2_profile
GLX_ARB_create_context_no_error
GLX_ARB_create_context_robustness
GLX_NV_delay_before_swap
GLX_EXT_stereo_tree
GLX_EXT_libglvnd
GLX_ARB_context_flush_control
GLX_NV_robustness_video_memory_purge
GLX_NV_multigpu_context
GLX_ARB_multisample
GLX_NV_float_buffer
GLX_ARB_fbconfig_float
GLX_EXT_framebuffer_sRGB
GLX_NV_copy_image
GL_AMD_multi_draw_indirect
GL_AMD_seamless_cubemap_per_texture
GL_AMD_vertex_shader_viewport_index
GL_AMD_vertex_shader_layer
GL_ARB_arrays_of_arrays
GL_ARB_base_instance
GL_ARB_bindless_texture
GL_ARB_blend_func_extended
GL_ARB_buffer_storage
GL_ARB_clear_buffer_object
GL_ARB_clear_texture
GL_ARB_clip_control
GL_ARB_color_buffer_float
GL_ARB_compatibility
GL_ARB_compressed_texture_pixel_storage
GL_ARB_conservative_depth
GL_ARB_compute_shader
GL_ARB_compute_variable_group_size
GL_ARB_conditional_render_inverted
GL_ARB_copy_buffer
GL_ARB_copy_image
GL_ARB_cull_distance
GL_ARB_debug_output
GL_ARB_depth_buffer_float
GL_ARB_depth_clamp
GL_ARB_depth_texture
GL_ARB_derivative_control
GL_ARB_direct_state_access
GL_ARB_draw_buffers
GL_ARB_draw_buffers_blend
GL_ARB_draw_indirect
GL_ARB_draw_elements_base_vertex
GL_ARB_draw_instanced
GL_ARB_enhanced_layouts
GL_ARB_ES2_compatibility
GL_ARB_ES3_compatibility
GL_ARB_ES3_1_compatibility
GL_ARB_ES3_2_compatibility
GL_ARB_explicit_attrib_location
GL_ARB_explicit_uniform_location
GL_ARB_fragment_coord_conventions
GL_ARB_fragment_layer_viewport
GL_ARB_fragment_program
GL_ARB_fragment_program_shadow
GL_ARB_fragment_shader
GL_ARB_fragment_shader_interlock
GL_ARB_framebuffer_no_attachments
GL_ARB_framebuffer_object
GL_ARB_framebuffer_sRGB
GL_ARB_geometry_shader4
GL_ARB_get_program_binary
GL_ARB_get_texture_sub_image
GL_ARB_gl_spirv
GL_ARB_gpu_shader5
GL_ARB_gpu_shader_fp64
GL_ARB_gpu_shader_int64
GL_ARB_half_float_pixel
GL_ARB_half_float_vertex
GL_ARB_imaging
GL_ARB_indirect_parameters
GL_ARB_instanced_arrays
GL_ARB_internalformat_query
GL_ARB_internalformat_query2
GL_ARB_invalidate_subdata
GL_ARB_map_buffer_alignment
GL_ARB_map_buffer_range
GL_ARB_multi_bind
GL_ARB_multi_draw_indirect
GL_ARB_multisample
GL_ARB_multitexture
GL_ARB_occlusion_query
GL_ARB_occlusion_query2
GL_ARB_parallel_shader_compile
GL_ARB_pipeline_statistics_query
GL_ARB_pixel_buffer_object
GL_ARB_point_parameters
GL_ARB_point_sprite
GL_ARB_polygon_offset_clamp
GL_ARB_post_depth_coverage
GL_ARB_program_interface_query
GL_ARB_provoking_vertex
GL_ARB_query_buffer_object
GL_ARB_robust_buffer_access_behavior
GL_ARB_robustness
GL_ARB_sample_locations
GL_ARB_sample_shading
GL_ARB_sampler_objects
GL_ARB_seamless_cube_map
GL_ARB_seamless_cubemap_per_texture
GL_ARB_separate_shader_objects
GL_ARB_shader_atomic_counter_ops
GL_ARB_shader_atomic_counters
GL_ARB_shader_ballot
GL_ARB_shader_bit_encoding
GL_ARB_shader_clock
GL_ARB_shader_draw_parameters
GL_ARB_shader_group_vote
GL_ARB_shader_image_load_store
GL_ARB_shader_image_size
GL_ARB_shader_objects
GL_ARB_shader_precision
GL_ARB_shader_storage_buffer_object
GL_ARB_shader_subroutine
GL_ARB_shader_texture_image_samples
GL_ARB_shader_texture_lod
GL_ARB_shading_language_100
GL_ARB_shader_viewport_layer_array
GL_ARB_shading_language_420pack
GL_ARB_shading_language_include
GL_ARB_shading_language_packing
GL_ARB_shadow
GL_ARB_sparse_buffer
GL_ARB_sparse_texture
GL_ARB_sparse_texture2
GL_ARB_sparse_texture_clamp
GL_ARB_spirv_extensions
GL_ARB_stencil_texturing
GL_ARB_sync
GL_ARB_tessellation_shader
GL_ARB_texture_barrier
GL_ARB_texture_border_clamp
GL_ARB_texture_buffer_object
GL_ARB_texture_buffer_object_rgb32
GL_ARB_texture_buffer_range
GL_ARB_texture_compression
GL_ARB_texture_compression_bptc
GL_ARB_texture_compression_rgtc
GL_ARB_texture_cube_map
GL_ARB_texture_cube_map_array
GL_ARB_texture_env_add
GL_ARB_texture_env_combine
GL_ARB_texture_env_crossbar
GL_ARB_texture_env_dot3
GL_ARB_texture_filter_anisotropic
GL_ARB_texture_filter_minmax
GL_ARB_texture_float
GL_ARB_texture_gather
GL_ARB_texture_mirror_clamp_to_edge
GL_ARB_texture_mirrored_repeat
GL_ARB_texture_multisample
GL_ARB_texture_non_power_of_two
GL_ARB_texture_query_levels
GL_ARB_texture_query_lod
GL_ARB_texture_rectangle
GL_ARB_texture_rg
GL_ARB_texture_rgb10_a2ui
GL_ARB_texture_stencil8
GL_ARB_texture_storage
GL_ARB_texture_storage_multisample
GL_ARB_texture_swizzle
GL_ARB_texture_view
GL_ARB_timer_query
GL_ARB_transform_feedback2
GL_ARB_transform_feedback3
GL_ARB_transform_feedback_instanced
GL_ARB_transform_feedback_overflow_query
GL_ARB_transpose_matrix
GL_ARB_uniform_buffer_object
GL_ARB_vertex_array_bgra
GL_ARB_vertex_array_object
GL_ARB_vertex_attrib_64bit
GL_ARB_vertex_attrib_binding
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_vertex_shader
GL_ARB_vertex_type_10f_11f_11f_rev
GL_ARB_vertex_type_2_10_10_10_rev
GL_ARB_viewport_array
GL_ARB_window_pos
GL_ATI_draw_buffers
GL_ATI_texture_float
GL_ATI_texture_mirror_once
GL_S3_s3tc
GL_EXT_texture_env_add
GL_EXT_abgr
GL_EXT_bgra
GL_EXT_bindable_uniform
GL_EXT_blend_color
GL_EXT_blend_equation_separate
GL_EXT_blend_func_separate
GL_EXT_blend_minmax
GL_EXT_blend_subtract
GL_EXT_compiled_vertex_array
GL_EXT_Cg_shader
GL_EXT_depth_bounds_test
GL_EXT_direct_state_access
GL_EXT_draw_buffers2
GL_EXT_draw_instanced
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_framebuffer_blit
GL_EXT_framebuffer_multisample
GL_EXTX_framebuffer_mixed_formats
GL_EXT_framebuffer_multisample_blit_scaled
GL_EXT_framebuffer_object
GL_EXT_framebuffer_sRGB
GL_EXT_geometry_shader4
GL_EXT_gpu_program_parameters
GL_EXT_gpu_shader4
GL_EXT_multi_draw_arrays
GL_EXT_multiview_texture_multisample
GL_EXT_multiview_timer_query
GL_EXT_packed_depth_stencil
GL_EXT_packed_float
GL_EXT_packed_pixels
GL_EXT_pixel_buffer_object
GL_EXT_point_parameters
GL_EXT_polygon_offset_clamp
GL_EXT_post_depth_coverage
GL_EXT_provoking_vertex
GL_EXT_raster_multisample
GL_EXT_rescale_normal
GL_EXT_secondary_color
GL_EXT_separate_shader_objects
GL_EXT_separate_specular_color
GL_EXT_shader_image_load_formatted
GL_EXT_shader_image_load_store
GL_EXT_shader_integer_mix
GL_EXT_shadow_funcs
GL_EXT_sparse_texture2
GL_EXT_stencil_two_side
GL_EXT_stencil_wrap
GL_EXT_texture3D
GL_EXT_texture_array
GL_EXT_texture_buffer_object
GL_EXT_texture_compression_dxt1
GL_EXT_texture_compression_latc
GL_EXT_texture_compression_rgtc
GL_EXT_texture_compression_s3tc
GL_EXT_texture_cube_map
GL_EXT_texture_edge_clamp
GL_EXT_texture_env_combine
GL_EXT_texture_env_dot3
GL_EXT_texture_filter_anisotropic
GL_EXT_texture_filter_minmax
GL_EXT_texture_integer
GL_EXT_texture_lod
GL_EXT_texture_lod_bias
GL_EXT_texture_mirror_clamp
GL_EXT_texture_object
GL_EXT_texture_shadow_lod
GL_EXT_texture_shared_exponent
GL_EXT_texture_sRGB
GL_EXT_texture_sRGB_R8
GL_EXT_texture_sRGB_decode
GL_EXT_texture_storage
GL_EXT_texture_swizzle
GL_EXT_timer_query
GL_EXT_transform_feedback2
GL_EXT_vertex_array
GL_EXT_vertex_array_bgra
GL_EXT_vertex_attrib_64bit
GL_EXT_window_rectangles
GL_EXT_x11_sync_object
GL_EXT_import_sync_object
GL_NV_robustness_video_memory_purge
GL_IBM_rasterpos_clip
GL_IBM_texture_mirrored_repeat
GL_KHR_context_flush_control
GL_KHR_debug
GL_EXT_memory_object
GL_EXT_memory_object_fd
GL_NV_memory_object_sparse
GL_KHR_parallel_shader_compile
GL_KHR_no_error
GL_KHR_robust_buffer_access_behavior
GL_KHR_robustness
GL_EXT_semaphore
GL_EXT_semaphore_fd
GL_NV_timeline_semaphore
GL_KHR_shader_subgroup
GL_KTX_buffer_region
GL_NV_alpha_to_coverage_dither_control
GL_NV_bindless_multi_draw_indirect
GL_NV_bindless_multi_draw_indirect_count
GL_NV_bindless_texture
GL_NV_blend_equation_advanced
GL_NV_blend_equation_advanced_coherent
GL_NVX_blend_equation_advanced_multi_draw_buffers
GL_NV_blend_minmax_factor
GL_NV_blend_square
GL_NV_clip_space_w_scaling
GL_NV_command_list
GL_NV_compute_program5
GL_NV_compute_shader_derivatives
GL_NV_conditional_render
GL_NV_conservative_raster
GL_NV_conservative_raster_dilate
GL_NV_conservative_raster_pre_snap
GL_NV_conservative_raster_pre_snap_triangles
GL_NV_conservative_raster_underestimation
GL_NV_copy_depth_to_color
GL_NV_copy_image
GL_NV_depth_buffer_float
GL_NV_depth_clamp
GL_NV_draw_texture
GL_NV_draw_vulkan_image
GL_NV_ES1_1_compatibility
GL_NV_ES3_1_compatibility
GL_NV_explicit_multisample
GL_NV_feature_query
GL_NV_fence
GL_NV_fill_rectangle
GL_NV_float_buffer
GL_NV_fog_distance
GL_NV_fragment_coverage_to_color
GL_NV_fragment_program
GL_NV_fragment_program_option
GL_NV_fragment_program2
GL_NV_fragment_shader_barycentric
GL_NV_fragment_shader_interlock
GL_NV_framebuffer_mixed_samples
GL_NV_framebuffer_multisample_coverage
GL_NV_geometry_shader4
GL_NV_geometry_shader_passthrough
GL_NV_gpu_program4
GL_NV_internalformat_sample_query
GL_NV_gpu_program4_1
GL_NV_gpu_program5
GL_NV_gpu_program5_mem_extended
GL_NV_gpu_program_fp64
GL_NV_gpu_shader5
GL_NV_half_float
GL_NV_light_max_exponent
GL_NV_memory_attachment
GL_NV_mesh_shader
GL_NV_multisample_coverage
GL_NV_multisample_filter_hint
GL_NV_occlusion_query
GL_NV_packed_depth_stencil
GL_NV_parameter_buffer_object
GL_NV_parameter_buffer_object2
GL_NV_path_rendering
GL_NV_path_rendering_shared_edge
GL_NV_pixel_data_range
GL_NV_point_sprite
GL_NV_primitive_restart
GL_NV_primitive_shading_rate
GL_NV_query_resource
GL_NV_query_resource_tag
GL_NV_register_combiners
GL_NV_register_combiners2
GL_NV_representative_fragment_test
GL_NV_sample_locations
GL_NV_sample_mask_override_coverage
GL_NV_scissor_exclusive
GL_NV_shader_atomic_counters
GL_NV_shader_atomic_float
GL_NV_shader_atomic_float64
GL_NV_shader_atomic_fp16_vector
GL_NV_shader_atomic_int64
GL_NV_shader_buffer_load
GL_NV_shader_storage_buffer_object
GL_NV_shader_subgroup_partitioned
GL_NV_shader_texture_footprint
GL_NV_shading_rate_image
GL_NV_stereo_view_rendering
GL_NV_texgen_reflection
GL_NV_texture_barrier
GL_NV_texture_compression_vtc
GL_NV_texture_dirty_tile_map
GL_NV_texture_env_combine4
GL_NV_texture_multisample
GL_NV_texture_rectangle
GL_NV_texture_rectangle_compressed
GL_NV_texture_shader
GL_NV_texture_shader2
GL_NV_texture_shader3
GL_NV_transform_feedback
GL_NV_transform_feedback2
GL_NV_uniform_buffer_unified_memory
GL_NV_uniform_buffer_std430_layout
GL_NV_vdpau_interop
GL_NV_vdpau_interop2
GL_NV_vertex_array_range
GL_NV_vertex_array_range2
GL_NV_vertex_attrib_integer_64bit
GL_NV_vertex_buffer_unified_memory
GL_NV_vertex_program
GL_NV_vertex_program1_1
GL_NV_vertex_program2
GL_NV_vertex_program2_option
GL_NV_vertex_program3
GL_NV_viewport_array2
GL_NV_viewport_swizzle
GL_NVX_conditional_render
GL_NV_gpu_multicast
GL_NVX_progress_fence
GL_NVX_gpu_memory_info
GL_NVX_nvenc_interop
GL_NV_shader_thread_group
GL_NV_shader_thread_shuffle
GL_KHR_blend_equation_advanced
GL_KHR_blend_equation_advanced_coherent
GL_OVR_multiview
GL_OVR_multiview2
GL_SGIS_generate_mipmap
GL_SGIS_texture_lod
GL_SGIX_depth_texture
GL_SGIX_shadow
GL_SUN_slice_accum
Where do we learn more about these, and how do we turn them off, or alter them?